% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Alderman:473934,
      author       = {Alderman, Oliver and Hannon, Alex and Holland, Diane and
                      Dupree, Ray and Feller, Steve},
      title        = {{S}tructural origin of the weak germanate anomaly in lead
                      germanate glass properties},
      journal      = {Journal of the American Ceramic Society},
      volume       = {105},
      number       = {2},
      issn         = {0002-7820},
      address      = {Westerville, Ohio},
      publisher    = {Soc.},
      reportid     = {PUBDB-2022-00352},
      pages        = {1010 - 1030},
      year         = {2022},
      abstract     = {Binary PbO–GeO$_2$ glasses have been studied in detail
                      from 5 to 75 mol\% PbO using high-resolution neutron
                      diffraction, high-energy X-ray diffraction, 207-Pb NMR,
                      pycnometry, and thermal analysis. The Ge–O coordination
                      number displays a broad maximum nGeO = 4.14(3) close to 27
                      mol\% PbO. This is smaller than the maximum nGeO = 4.3
                      reported in CaO–GeO$_2$ glasses but occurs at a similar
                      composition. This structural behavior appears to explain the
                      relatively weak germanate anomaly manifest in lead germanate
                      glasses, for example as a maximum in the measured atom
                      number density and a plateau in the glass transition
                      temperatures. The structural role of Pb(II) is complex. On
                      the one hand, short covalent Pb–O bonds and small Pb–O
                      coordination numbers of ∼3 to 4 indicate glass network
                      former character for Pb(II), associated with a
                      stereochemically active electron lone pair. On the other
                      hand, the presence of some GeO$_5$ or GeO$_6$ units, in
                      addition to the majority GeO$_4$ tetrahedral species,
                      indicates some modifier character of Pb(II) at low PbO
                      contents, giving rise to the observed weak germanate
                      anomaly, as well as elongation and enhanced ionicity of the
                      Pb–O bonds. Overall, the observed structural behavior of
                      Pb(II) in lead germanate glasses appears as intermediate
                      between that observed in lead silicate and lead borate
                      glasses. Despite rapid quenching, at low PbO contents, the
                      glasses studied exhibited nanoscale heterogeneity, evidenced
                      by small-angle X-ray scattering consistent with the early
                      stages of spinodal decomposition.},
      cin          = {DOOR ; HAS-User},
      ddc          = {660},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {899 - ohne Topic (POF4-899)},
      pid          = {G:(DE-HGF)POF4-899},
      experiment   = {EXP:(DE-H253)D-BW5-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000710191700001},
      doi          = {10.1111/jace.18166},
      url          = {https://bib-pubdb1.desy.de/record/473934},
}