<?xml version="1.0" encoding="utf-8"?>
<export-example>
  <doc>
    <id>19107</id>
    <completedYear/>
    <publishedYear>2015</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>2031</pageFirst>
    <pageLast>2036</pageLast>
    <pageNumber/>
    <edition/>
    <issue>9</issue>
    <volume>212</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2017-03-08</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">NMR investigation of boron impurities in refined metallurgical grade silicon</title>
    <abstract language="eng">The nuclear magnetic resonance (NMR) method was applied for tracking boron impurities in the refining process of metallurgical grade (MG) silicon. From the NMR signal of the 11B isotope at an operating temperature 4.2 K, the boron concentration can be estimated down to the order of 110 wppm B. After melting and resolidification of MG-Si alloyed with Ca and Ti, a major fraction of B impurities remains in the Si solid solution as inferred from the characteristic NMR frequency. The alloying element Ti does not form substantial fractions of TiB2. Acid leaching of crushed powders of MG-Si alloyed with Ca and Ti can diminish the initial impurity content of B suggesting its accumulation in the grain boundary phases.</abstract>
    <parentTitle language="eng">Physica status solidi. A, Applications and Materials Science</parentTitle>
    <identifier type="doi">10.1002/pssa.201431908</identifier>
    <identifier type="url">http://onlinelibrary.wiley.com/doi/10.1002/pssa.201431908/full</identifier>
    <identifier type="issn">1862-6319</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <author>
      <firstName>Hans-Joachim</firstName>
      <lastName>Grafe</lastName>
    </author>
    <submitter>
      <firstName>Jörg</firstName>
      <lastName>Acker</lastName>
    </submitter>
    <author>
      <firstName>Wolfgang</firstName>
      <lastName>Löser</lastName>
    </author>
    <author>
      <firstName>Steffen</firstName>
      <lastName>Schmitz</lastName>
    </author>
    <author>
      <firstName>Miroslava</firstName>
      <lastName>Sakaliyska</lastName>
    </author>
    <author>
      <firstName>Sabine</firstName>
      <lastName>Wurmehl</lastName>
    </author>
    <author>
      <firstName>Stefan</firstName>
      <lastName>Eisert</lastName>
    </author>
    <author>
      <firstName>Birk</firstName>
      <lastName>Reichenbach</lastName>
    </author>
    <author>
      <firstName>Jörg</firstName>
      <lastName>Acker</lastName>
    </author>
    <author>
      <firstName>Anja</firstName>
      <lastName>Rietig</lastName>
    </author>
    <author>
      <firstName>Jana</firstName>
      <lastName>Ducke</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>boron</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>impurity</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>intermetallic compounds</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>nuclear magnetic resonance</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>silicon</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>transition-metal diboride</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Si-Al melt</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>removal</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>solidification</value>
    </subject>
    <collection role="institutes" number="2206">FG Physikalische Chemie</collection>
  </doc>
  <doc>
    <id>27890</id>
    <completedYear/>
    <publishedYear>2021</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>2492</pageFirst>
    <pageLast>2500</pageLast>
    <pageNumber/>
    <edition/>
    <issue>11</issue>
    <volume>36</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation>Leibniz Institute for Solid State and Materials Research (IFW) Dresden</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-11-09</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">New insights into boron species in acidic digestion solutions of boron-doped silicon</title>
    <abstract language="eng">The exact and precise determination of the boron concentration in silicon is still a challenge. A systematic investigation dealing with the digestions of 60 silicon samples with HF-HNO3 and subsequent boron determination by ICP-OES revealed that the concentration found could be up to 60% lower than the actual boron concentration depending on the composition of the sample solution. As the original boron–silicon compound that was identified was colloidally precipitated in the presence of an excess of hydrofluoric acid and then partially retained by filtration or by the sample introduction system, systematic lower boron concentrations were determined. In acidic, HF-free digestion solutions, this compound existed in a soluble form parallel to the borate in B(OH)4−. In an excess of hydrofluoric acid, the compound was converted into the colloidal form and, in parallel, B(OH)4− was converted to tetrafluoroborate, BF4−. For the composition of the colloidal compound, a molar ratio of boron to silicon of 1 : 4 could be determined. 11B-ss-NMR analysis revealed a tetrahedral geometry compound with a central boron atom surrounded by four silicon atoms. It is assumed that a soluble form with four –Si(OH)3 groups was present in the hydrofluoric acid-free solutions, while an insoluble form with four –SiF3 groups was present in HF-containing solution.</abstract>
    <parentTitle language="eng">Journal of Analytical Atomic Spectrometry</parentTitle>
    <identifier type="url">https://pubs.rsc.org/en/content/articlelanding/2021/ja/d1ja00190f</identifier>
    <identifier type="issn">1364-5544</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Anja</firstName>
      <lastName>Rietig</lastName>
    </author>
    <submitter>
      <firstName>Jörg</firstName>
      <lastName>Acker</lastName>
    </submitter>
    <author>
      <firstName>Hans-Joachim</firstName>
      <lastName>Grafe</lastName>
    </author>
    <author>
      <firstName>Jörg</firstName>
      <lastName>Acker</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>silicon</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>ICP-OES</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>etching</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>hydrofluoric acid</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>nitric acid</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>11B-NMR</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>high-precision chemical analysis</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>boron</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>digestion</value>
    </subject>
    <collection role="institutes" number="2206">FG Physikalische Chemie</collection>
  </doc>
  <doc>
    <id>29183</id>
    <completedYear/>
    <publishedYear>2022</publishedYear>
    <thesisYearAccepted/>
    <language>deu</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>14</pageNumber>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_ref</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2022-07-28</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="deu">Understanding the Reasons for Erroneous Determinations of Boron in Silicon following Wet Chemical Digestion in HF/HNO3</title>
    <parentTitle language="deu">Proceedings of the Silicon for the Chemical &amp; Solar Industry XVI</parentTitle>
    <identifier type="isbn">978-82-692919-0-2</identifier>
    <identifier type="url">https://ssrn.com/abstract=4123058</identifier>
    <identifier type="doi">10.2139/ssrn.4123058</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Anja</firstName>
      <lastName>Rietig</lastName>
    </author>
    <submitter>
      <firstName>Anja</firstName>
      <lastName>Rietig</lastName>
    </submitter>
    <author>
      <firstName>Hans-Joachim</firstName>
      <lastName>Grafe</lastName>
    </author>
    <author>
      <firstName>Jörg</firstName>
      <lastName>Acker</lastName>
    </author>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>boron</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>silicon</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>species</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>trace element</value>
    </subject>
    <collection role="institutes" number="2206">FG Physikalische Chemie</collection>
  </doc>
</export-example>
