<?xml version="1.0" encoding="utf-8"?>
<export-example>
  <doc>
    <id>17579</id>
    <completedYear/>
    <publishedYear>2007</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>638</pageFirst>
    <pageLast>644</pageLast>
    <pageNumber/>
    <edition/>
    <issue>4</issue>
    <volume>68</volume>
    <type>article</type>
    <publisherName>Pergamon Press</publisherName>
    <publisherPlace>New York, NY</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Study of potassium-zinc borophosphate glasses</title>
    <abstract language="eng">Potassiumzinc borophosphate glasses were prepared and studied in two compositional series xK2O(50x)ZnO10B2O340P2O5 and
xK2O(50x)ZnO20B2O330P2O5 with x = 0, 10, 20, 30, 40 and 50 mol% K2O. The replacement of zinc by potassium decreases the
density and increases the molar volume of these glasses, whereas glass transition temperature and chemical durability decrease with
increasing potassium content. Structural changes were studied by 11B and 31P MAS NMR and Raman spectroscopy. The observed
changes in the spectra and the properties of the studied glasses can be ascribed to several reasons and namely to the differences in the
space occupied by cations Zn2+ and 2K+, the differences in the electronegativity of zinc and potassium and a large difference in the field
strength of Zn2+ and K+ cations and thus higher ionicity of KO bonds in comparison with ZnO bonds.</abstract>
    <parentTitle language="eng">Journal of physics and chemistry of solids</parentTitle>
    <identifier type="old">19648</identifier>
    <identifier type="doi">10.1016/j.jpcs.2007.02.012</identifier>
    <identifier type="issn">0022-3697</identifier>
    <enrichment key="bibliotheksstandort">Sonderstandort: Publica-Schrank</enrichment>
    <enrichment key="date_peer_review">16.06.2008</enrichment>
    <author>L. Koudelka</author>
    <author>P. Mosner</author>
    <author>Michaela Zeyer-Düsterer</author>
    <author>Christian Jäger</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>A. Glasses</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>C. Raman spectroscopy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>D. Nuclear magnetic resonance</value>
    </subject>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")</collection>
  </doc>
  <doc>
    <id>11015</id>
    <completedYear/>
    <publishedYear>2005</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>50</pageFirst>
    <pageLast>64</pageLast>
    <pageNumber/>
    <edition/>
    <issue>1-2</issue>
    <volume>27</volume>
    <type>article</type>
    <publisherName>Academ. Press</publisherName>
    <publisherPlace>Orlando, Fla.</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Combined 17O NMR and 11B-31P double resonance NMR studies of sodium borophosphate glasses</title>
    <abstract language="eng">17O enriched sodium borophosphate glasses were prepared from isotopically enriched NaPO3 and H3BO3. These glasses have been studied by 17O, 11B and 31P NMR including 17O and 11B multiple quantum magic angle sample spinning (MQMAS), 11B31P heteronuclear correlation (HETCOR) NMR and 11B 31P rotational echo double resonance (REDOR). For comparison, the crystalline borophosphates BPO4 and Na5B2P3O13 were included in the investigations. The latter compound shows three sharp 31P resonances at -0.2, -2 and -8 ppm and two BO4 sites that can only be resolved by MQMAS.

The 17O NMR spectra were recorded using both the static echo method at medium magnetic field (9.4 T) as well as MAS and MQMAS methods at high field (17.6 T). In total, five oxygen sites were identified in these borophosphate glasses: POP, NaOP, POB, BOB, NaOB. However, these five sites are not present simultaneously in any of the glasses. The 17O MQMAS spectra prove that POB links play a major role in borophosphate glasses. These results are confirmed by the complementary 11B MAS spectra that show the presence of asymmetric and symmetric trigonal groups BO3a and BO3s and two tetrahedral BO4 units. 11B 31P REDOR NMR is used to give independent information to assign the 11B lines to structural units present in the glasses. These REDOR measurements reveal that BOP bonds are present for each borate unit, including the BO3 groups. Particularly, a structural proposal for the two different BO4 resonances is given in terms of a different number of bonded phosphate tetrahedra. The 31P MAS spectra are usually broad and not well resolved. It is shown by 11B31P HETCOR NMR that a possible structural assignment of a 31P signal at about -20 ppm to Q2 units as in binary sodium phosphate glasses is wrong and that the phosphate tetrahedron belonging to this resonance must be connected to borate groups</abstract>
    <parentTitle language="eng">Solid state nuclear magnetic resonance</parentTitle>
    <identifier type="old">12643</identifier>
    <identifier type="doi">10.1016/j.ssnmr.2004.06.009</identifier>
    <identifier type="issn">0926-2040</identifier>
    <identifier type="issn">1527-3326</identifier>
    <enrichment key="bibliotheksstandort">Sonderstandort: Publica-Schrank</enrichment>
    <enrichment key="date_peer_review">27.10.2005</enrichment>
    <author>Michaela Zeyer-Düsterer</author>
    <author>L. Montagne</author>
    <author>G. Palavit</author>
    <author>Christian Jäger</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>NMR</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Sodium borophosphate glasses</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Glass structure</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>NA5B2P3O13</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>O-17 NMR</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>REDOR</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>MQMAS</value>
    </subject>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")</collection>
  </doc>
  <doc>
    <id>14811</id>
    <completedYear/>
    <publishedYear>2006</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>471</pageFirst>
    <pageLast>475</pageLast>
    <pageNumber/>
    <edition/>
    <issue>4</issue>
    <volume>47</volume>
    <type>article</type>
    <publisherName>Thornton</publisherName>
    <publisherPlace>Sheffield</publisherPlace>
    <creatingCorporation>Society of Glass Technology</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Medium range order in lead borophosphate glasses</title>
    <abstract language="eng">The structure of 50PbO-xB2O3-(50-x)P2O5 glasses with x=0-25 mol% B2O3 was refined by Raman and 11B MQMAS NMR. The analysis of Raman spectra, using the concentration step of 2 mol% B2O3 within the range of 0-12 mol% B2O3, showed that the evolution of changes in the type of oxygen bridges can be observed from the Raman bands within the range of 600-800 cm-1. 11B MQMAS NMR spectra of glasses with x=15, 20 and 25 mol% B2O3 revealed the presence of two BO4 sites in these glasses. The first site B1O4, characterised by the chemical shift of d=-3·8  (-3·4) ppm, was assigned to tetrahedral B(OP)4 structural units. Within the concentration range x=15-25 mol% B2O3, the site B1O4 is gradually replaced by the site B2O4 with the chemical shift of d=-1·8  (-1·1) ppm. This second site was assigned to the presence of B(OP)3(OB) units in which the central boron atom is linked to three PO4 groups and one BO3 group.</abstract>
    <parentTitle language="eng">Physics and chemistry of glasses</parentTitle>
    <identifier type="old">16645</identifier>
    <identifier type="issn">0031-9090</identifier>
    <enrichment key="bibliotheksstandort">Sonderstandort: Publica-Schrank</enrichment>
    <author>L. Koudelka</author>
    <author>P. Mosner</author>
    <author>J. Jirák</author>
    <author>Michaela Zeyer-Düsterer</author>
    <author>Christian Jäger</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>NMR</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Raman</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Struktur</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Gläser</value>
    </subject>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")</collection>
  </doc>
</export-example>
