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  <doc>
    <id>1006</id>
    <completedYear>2017</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>101</pageFirst>
    <pageLast>107</pageLast>
    <pageNumber/>
    <edition/>
    <issue>343</issue>
    <volume>2017</volume>
    <type>article</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2018-09-01</completedDate>
    <publishedDate>2017-10-25</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Influence of sputtering pressure on the nanostructure and the X-ray reflectivity of iridium coatings</title>
    <abstract language="eng">Reflective mirror coatings made of iridium are used in X-ray telescopes of the Chandra X-ray Observatory (CXO) launched in 1999 by the National Aeronautics and Space Administration (NASA) to investigate astronomical sources at photon energies below 10. keV. These coatings were produced in a DC magnetron sputtering process and have so far proven their suitability for space-based applications. We are considering in the present paper the processing of thin iridium films for lightweight telescopes using the radio frequency magnetron sputtering technique with an oblique angle deposition. The coating development presented here is focused on the influence of total sputtering pressure on film properties as well as on its impact on the mirror's performance. Characterisation methods such as X-ray diffractometry, X-ray reflectometry, atomic force microscopy and transmission electron microscopy have been used. Correlations between morphology, density, surface micro-roughness, crystal structure of the iridium layer and the expected reflectivity of the X-ray mirror are described and discussed.</abstract>
    <parentTitle language="eng">Surface and Coatings Technology</parentTitle>
    <identifier type="url">https://doi.org/10.1016/j.surfcoat.2017.10.062</identifier>
    <identifier type="issn">0257-8972</identifier>
    <enrichment key="copyright">1</enrichment>
    <licence>Keine Lizenz - es gilt das deutsche Urheberrecht</licence>
    <author>Anne-Catherine Probst</author>
    <author>Manfred Stollenwerk</author>
    <author>Florian Emmerich</author>
    <author>Andre Büttner</author>
    <author>Sebastian Zeising</author>
    <author>Johannes Stadtmüller</author>
    <author>Franziska Riethmüller</author>
    <author>Veronika Stehlikova</author>
    <author>Wen Mingwu</author>
    <author>Laura Proserpio</author>
    <author>Christine Damm</author>
    <author>Bernd Rellinghaus</author>
    <author>Thorsten Döhring</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Iridium</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>sputtering</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>microstructure</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>coating</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>X-ray</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Iridium</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Röntgenteleskop</value>
    </subject>
    <collection role="forschungsschwerpunkte" number="">Clean Tech</collection>
    <collection role="forschungsschwerpunkte" number="">Innovative Material Processing</collection>
    <collection role="forschungsschwerpunkte" number="">Material Testing &amp; Sensor Technology</collection>
  </doc>
  <doc>
    <id>1014</id>
    <completedYear>2018</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>8775</pageFirst>
    <pageLast>8779</pageLast>
    <pageNumber/>
    <edition/>
    <issue>57 (29)</issue>
    <volume>2018</volume>
    <type>article</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2018-10-09</completedDate>
    <publishedDate>2018-10-10</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Coating stress analysis and compensation for iridium-based x-ray mirrors</title>
    <abstract language="eng">Iridium-based coatings for mirrors of x-ray telescopes are studied. In particular, stress-induced deformation is characterized and shown to be compressive and equal to −1786  MPa. Two methods for stress compensation are then studied. One relies on the deposition of silica on the back surface of the substrate and a second one relies on the deposition of a chromium sublayer. Advantages and drawbacks of each of these techniques are presented.</abstract>
    <parentTitle language="eng">Applied Optics</parentTitle>
    <identifier type="url">https://doi.org/10.1364/AO.57.008775</identifier>
    <enrichment key="copyright">1</enrichment>
    <licence>Keine Lizenz - es gilt das deutsche Urheberrecht</licence>
    <author>Anne-Catherine Probst</author>
    <editor> Publishing OSA</editor>
    <author>Thomas Begou</author>
    <author>Thorsten Döhring</author>
    <author>Sebastian Zeising</author>
    <author>Manfred Stollenwerk</author>
    <author>Johannes Stadtmüller</author>
    <author>Florian Emmerich</author>
    <author>Julien Lumeau</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>iridium</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>coating stress</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>X-ray</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>mirror</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>astronomy</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Röntgenteleskop</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Iridium</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Spiegelteleskop</value>
    </subject>
    <collection role="forschungsschwerpunkte" number="">Innovative Material Processing</collection>
    <collection role="forschungsschwerpunkte" number="">Material Testing &amp; Sensor Technology</collection>
  </doc>
  <doc>
    <id>1940</id>
    <completedYear>2021</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>deu</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation>German Aerospace Center (DLR), Hardthausen</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-09-28</completedDate>
    <publishedDate>2021-09-22</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="deu">Combustion efficiency of iridium coated pellets for environmentally friendly space propulsion</title>
    <abstract language="eng">Most of the satellite engines still uses critical fuels such as hydrazine, which is chemically aggressive, toxic and carcinogenic. New developments for satellite engines try to avoid such critical propellants. One promising approach is the usage of rocket-grade hydrogen peroxide [H2O2] in mono- and bipropellant driven rocket engines. Catalysts in the rocket engines convert the hydrogen peroxide by an exothermic catalytic reaction; the resulting hot gases oxygen and water vapor provide the thrust. Currently used catalysts are, for example, Al2O3 pellets impregnated with platinum. &#13;
Within a joint research project of Aschaffenburg University and the German Aerospace Center new catalysts are developed. They consist of ceramic pellets coated with iridium using the magnetron sputtering process. Thereby the surface structure of the iridium layers strongly depends on the used sputtering process conditions [1]. After optimization of the sputtering parameters, it was demonstrated in laboratory experiments that the catalytic effect (measured by the volume of released gas) can be increased by a factor of four compared to platinum impregnated pellets [2].&#13;
In first hot firing tests at the test bench complex M11 at the DLR- Institute of Space Propulsion, these new, iridium-based catalysts have been used in a model combustion chamber for hydrogen peroxide decomposition. For this purpose, the reaction chamber was filled with iridium pellets in the high-altitude simulation chamber of the M11.2 test bench. The model chamber was equipped with numerous measuring devices like temperature and pressure sensors (e.g. Tcat, pcat). With the help of the mass flow and the herein obtained data, performance characteristics of the propellant system were accessible. High-concentrated hydrogen peroxide was used in the experiments as monopropellant (~ 87-wt.% H2O2). During the experiments, the combustion chamber was operated in pulse mode and in continuous mode. Aim of this campaign called MoCa (“Monopropellant Catalytic Demonstrator”) is the demonstration of functionality and the performance evaluation of this iridium-based monopropellant system. Recent experimental results will be presented. &#13;
References:&#13;
[1]	A. Büttner et al., Thin Solid Films 2018, 662: 41–46 &#13;
[2]	M. Stollenwerk et al., Journal of Materials Science 2021, 56(16), 9974-9984</abstract>
    <parentTitle language="deu">14th  Pico- and Nanosatellite Workshop, Würzburg, Germany</parentTitle>
    <enrichment key="copyright">1</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <licence>Keine Lizenz - es gilt das deutsche Urheberrecht</licence>
    <author>Dominic Freudenmann</author>
    <author>Manfred Stollenwerk</author>
    <author>Thorsten Döhring</author>
    <author>Johannes Stadtmüller</author>
    <author>Michele Negri</author>
    <author>Felix Lauck</author>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Satellitentechnik</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Katalysator</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Iridium</value>
    </subject>
    <collection role="forschungsschwerpunkte" number="">Innovative Material Processing</collection>
    <collection role="forschungsschwerpunkte" number="">Material Testing &amp; Sensor Technology</collection>
  </doc>
  <doc>
    <id>1973</id>
    <completedYear>2021</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>2</pageLast>
    <pageNumber>2</pageNumber>
    <edition/>
    <issue>122</issue>
    <volume>2021</volume>
    <type>conferenceobject</type>
    <publisherName>DGaO</publisherName>
    <publisherPlace/>
    <creatingCorporation>TH Aschaffenburg</creatingCorporation>
    <contributingCorporation>Osservatorio Astronomico di Brera</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-12-04</completedDate>
    <publishedDate>2021-12-01</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Low-density coatings for enhanced X-ray reflectivity  of astronomical telescope mirrors</title>
    <abstract language="eng">High reflectivity grazing incidence mirrors of astronomical X-ray telescopes are usually coated with thin layers of iridium, gold, or platinum. Due to a series of absorption edges, these noble metals have low reflectivity in the 2 - 4 keV band. We present the development of innovative material combinations using chromium and an additional layer of polydopamine for enhanced reflectivity X-ray coatings.</abstract>
    <parentTitle language="eng">DGaO Proceedings</parentTitle>
    <identifier type="issn">1614-8436</identifier>
    <identifier type="url">https://www.dgao-proceedings.de/download/122/122_p3.pdf</identifier>
    <enrichment key="copyright">1</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <licence>Keine Lizenz - es gilt das deutsche Urheberrecht</licence>
    <author>Thorsten Döhring</author>
    <author>Johannes Stadtmüller</author>
    <author>Manfred Stollenwerk</author>
    <author>Vincenzo Cotroneo</author>
    <author>Giovanni Pareschi</author>
    <author>Eugenio Gibertini</author>
    <author>Luca Magagnin</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Dopamin</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Iridium</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>mirror</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>coating</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>X-ray</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Röntgenteleskop</value>
    </subject>
    <collection role="forschungsschwerpunkte" number="">Innovative Material Processing</collection>
    <collection role="forschungsschwerpunkte" number="">Material Testing &amp; Sensor Technology</collection>
    <file>https://opus4.kobv.de/opus4-h-ab/files/1973/122_p3.pdf</file>
  </doc>
  <doc>
    <id>1974</id>
    <completedYear>2021</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>1</pageLast>
    <pageNumber>2</pageNumber>
    <edition/>
    <issue>122</issue>
    <volume>2021</volume>
    <type>conferenceobject</type>
    <publisherName>DGaO</publisherName>
    <publisherPlace/>
    <creatingCorporation>TH Aschaffenburg</creatingCorporation>
    <contributingCorporation>Wrexham Glyndwr University</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-12-04</completedDate>
    <publishedDate>2021-12-01</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Optical characterization of reflective coatings for astronomical telescope mirrors</title>
    <abstract language="eng">Aluminium evaporation is still the standard solution for reflective coatings of large astronomical mirrors. Silver and gold are also used in specific cases depending on the targeted wavelength. This study characterized different metallic coatings - including unusual ones like sputtered iridium - to identify the most suitable mirror coating for the spectral range from ultraviolet to infrared wavelengths.</abstract>
    <parentTitle language="eng">DGaO Proceedings</parentTitle>
    <identifier type="issn">1614-8436</identifier>
    <identifier type="url">https://www.dgao-proceedings.de/download/122/122_p4.pdf</identifier>
    <enrichment key="copyright">1</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <licence>Keine Lizenz - es gilt das deutsche Urheberrecht</licence>
    <author>Thorsten Döhring</author>
    <author>Claudius Rödling</author>
    <author>Kevin Kimmel</author>
    <author>Sebastian Zeising</author>
    <author>Johannes Stadtmüller</author>
    <author>Manfred Stollenwerk</author>
    <author>Shruti Verma</author>
    <author>Paul Rees</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Iridium</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>mirror</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>coating</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>reflectivity</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>telescope</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Spiegelteleskop</value>
    </subject>
    <collection role="forschungsschwerpunkte" number="">Innovative Material Processing</collection>
    <collection role="forschungsschwerpunkte" number="">Material Testing &amp; Sensor Technology</collection>
    <file>https://opus4.kobv.de/opus4-h-ab/files/1974/122_p4.pdf</file>
  </doc>
  <doc>
    <id>1787</id>
    <completedYear>2021</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>11</pageLast>
    <pageNumber/>
    <edition/>
    <issue>2021</issue>
    <volume>2021</volume>
    <type>article</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation>German Aerospace Center (DLR), Hardthausen</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-03-01</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Sputtered highly effective iridium catalysts: a new approach for green satellite propulsion</title>
    <abstract language="eng">This work demonstrated the large potential of sputtered iridium metal for catalytic reactions shown by the example of decomposition of hydrogen peroxide (H2O2) for space propulsion systems. For this purpose, iridium was coated onto Al2O3 pellets by a sputter process under varied process parameters. Depending on previously selected parameters, the obtained metal-loaded pellets offer closed- and/or open-shell structures. Catalytic productivity of these first-generation iridium-sputtered catalysts was estimated in laboratory experiments and compared to platinum-loaded pellets. Under optimized sputter-process conditions, the reactivity is significantly improved compared to the platinum-impregnated pellets. The better catalytic productivity can be explained by the increased active surface area of the iridium layers on the pellets. The surface morphology and the microstructure of the iridium coating can be actively controlled by the sputter pressure. The results are in accordance with the sputtering process pressure tendency described by the Thornton Structure–Zone Model.</abstract>
    <parentTitle language="eng">Journal of Materials Science</parentTitle>
    <identifier type="doi">https://doi.org/10.1007/s10853-021-05897-z</identifier>
    <enrichment key="copyright">1</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <licence>Keine Lizenz - es gilt das deutsche Urheberrecht</licence>
    <author>Manfred Stollenwerk</author>
    <author>Thorsten Döhring</author>
    <author>Dominic Freudenmann</author>
    <author>Tobias Schäfer</author>
    <author>Johannes Stadtmüller</author>
    <author>Nicole Röcke</author>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Iridium</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Katalysator</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Satellitentechnik</value>
    </subject>
    <collection role="forschungsschwerpunkte" number="">Innovative Material Processing</collection>
    <collection role="forschungsschwerpunkte" number="">Material Testing &amp; Sensor Technology</collection>
  </doc>
  <doc>
    <id>1859</id>
    <completedYear>2021</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>1</pageNumber>
    <edition/>
    <issue/>
    <volume>2021</volume>
    <type>other</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation>TH Aschaffenburg</creatingCorporation>
    <contributingCorporation>DLR Lampoldshausen</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-05-17</completedDate>
    <publishedDate>2021-05-05</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Nanostructured iridium catalysts for effective hydrogen peroxide decomposition</title>
    <abstract language="eng">The EU intends to restrict the use of critical fuels in space propulsion systems. These propellants like hydrazine are chemically aggressive, toxic and carcinogenic. Space propulsion of the future should be environmentally friendly, inexpensive, and easy to handle. Aschaffenburg University and DLR are currently developing environmentally friendly technologies for future satellite engines. Thereby rocket-grade hydrogen peroxide, which is foreseen as a substitute, is converted to uncritical water vapour and oxygen by an exothermic catalytic reaction on nanostructured iridium layers. The resulting hot gases provide the required amount of thrust. The iridium catalyst layers are coated onto ceramic pellets, using RF magnetron sputtering technology. The catalytic functionality was tested afterwards at the chemical laboratories of DLR. First experimental results show a significantly higher catalytic activity for nanostructured iridium surfaces than for smoother crystalline layers.</abstract>
    <abstract language="deu">Poster</abstract>
    <parentTitle language="eng">EuroNanoForum</parentTitle>
    <enrichment key="copyright">1</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <licence>Keine Lizenz - es gilt das deutsche Urheberrecht</licence>
    <author>Thorsten Döhring</author>
    <author>Manfred Stollenwerk</author>
    <author>Johannes Stadtmüller</author>
    <author>Dominic Freudenmann</author>
    <author>Nicole Röcke</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>satellite</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>propulsion</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>catalyst</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>iridium</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>hydrogen peroxide</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Iridium</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Katalysator</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>swd</type>
      <value>Satellitentechnik</value>
    </subject>
    <collection role="forschungsschwerpunkte" number="">Innovative Material Processing</collection>
    <collection role="forschungsschwerpunkte" number="">Material Testing &amp; Sensor Technology</collection>
    <file>https://opus4.kobv.de/opus4-h-ab/files/1859/P0008-S0026-poster.jpg</file>
  </doc>
  <doc>
    <id>2398</id>
    <completedYear>2024</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>852</pageFirst>
    <pageLast>864</pageLast>
    <pageNumber>13</pageNumber>
    <edition/>
    <issue/>
    <volume>92</volume>
    <type>article</type>
    <publisherName>Elsevier BV</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Overall alkaline water electrolysis over active, stable, low loading iridium catalysts sputtered on nickel foam</title>
    <parentTitle language="eng">International Journal of Hydrogen Energy</parentTitle>
    <identifier type="issn">0360-3199</identifier>
    <identifier type="doi">10.1016/j.ijhydene.2024.10.306</identifier>
    <enrichment key="opus_doi_flag">true</enrichment>
    <enrichment key="opus_import_data">x</enrichment>
    <enrichment key="local_crossrefDocumentType">journal-article</enrichment>
    <enrichment key="local_crossrefLicence">https://www.elsevier.com/tdm/userlicense/1.0/</enrichment>
    <enrichment key="local_import_origin">crossref</enrichment>
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    <author>Isilda Amorim</author>
    <author>Natalia C.M. Spera</author>
    <author>Nicoleta Nicoara</author>
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    <author>Dominic Freudenmann</author>
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    <title language="eng">Experimental studies on iridium catalysts for water PEM electrolysis</title>
    <abstract language="eng">The enhanced use of sustainable energy sources entails strong fluctuations in the availability of electric power. As we need new approaches for energy distribution and energy storage systems, hydrogen is often discussed as a promising energy carrier. PEM electrolysis can be used to transform electrical energy from renewable sources into hydrogen. One challenge in this context is the need for catalysts, as these contribute significantly to the performance of the electrolysis cell. The commonly used platinum group metal (PGM) catalysts like Iridium are quite scarce and therefore expensive. A possible approach to reduce the Ir content is the application of magnetron sputtering for catalyst generation. By selecting the right process parameters, the desired layer properties can be set very precisely during sputtering. This ensures a large surface area with reduced material usage. The introduction of carbon can increase the surface area of the catalyst further and enhance its effectiveness. First results of investigations on the catalytic effect of sputtered Ir catalyst layers will be presented.</abstract>
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    <title language="eng">Characterisation of X-ray mirrors based on  chromium-iridium tri-layer coatings</title>
    <abstract language="eng">Iridium-based layer systems are highly effective mirror coatings for space-born X-ray telescopes. During the recent years, Aschaffenburg University of Applied Sciences and its partners developed stress compensated chromium-iridium coatings for such astronomical applications, using chromium as an adhesive layer between iridium reflective layer and mirror substrate. However, there was room for improvement: To overcome the disturbing reflectivity reduction of the iridium absorption edge around 2 keV photon energy, thin overcoat layers of chromium are applied in addition now. This layer system has been analyzed by atomic force microscopy and transmission electron microscopy images. Furthermore, the reflectivity of such innovative X-ray mirrors based on chromium-iridium tri-layer coatings was recently measured at PTB's four-crystal monochromator beamline at the synchrotron radiation facility BESSY II.  The experimental results, obtained for photon energies between 1.9 keV and 11 keV at two grazing incidence angles (0.6 degree and 0.9 degree) and their comparison with corresponding simulations are presented in this contribution. When compared to simulations of pure iridium coatings, a significantly higher reflectivity was achieved especially in the soft X-ray regime between 2 keV and 4 keV. Such chromium-iridium tri-layer coatings have high potential to increase the effective area for X-ray telescopes in Lobster Eye Design, for Wolter-I type X-ray optics, and for silicon pore optics as considered for the ATHENA telescope of the European Space Agency.</abstract>
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    <author>Vincenzo Cotroneo</author>
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