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Evolution of the germanium-oxygen coordination number in lithium-lead-germanate glasses
Rada, M; Aldea, N; Wu ZH(吴忠华); Zhang J(张静); Wu, ZH; Jing, Z; Rada, S; Culea, E; Macavei, S; Balan, R; Suciu, RC; Erhan, RV; Bodnarchuk, V
2016
发表期刊JOURNAL OF NON-CRYSTALLINE SOLIDS
卷号437页码:10-16
摘要Lithium-lead-germanate glasses in the xLi(2)O center dot(100-x)[7GeO(2)center dot 3PbO] system, where 0 <= x <= 40 mol% Li2CO3 exhibit a "germanate anomaly", which is a maximum in their density profiles with the addition of Li2CO3 up to 20 mol%. The structural characterization of the samples was performed by investigations of Raman spectroscopy and X-ray scattering analysis. An EXAFS analysis of the spectra collected at the germanium K-edge for series of lithium-lead-germanate glasses is also presented. With the EXAFS-extracted structural parameters were reconstructed to the local neighborhood of Ge atoms and were verified current opinions on the germanate anomaly in the considered glasses. The formation of higher-coordinated Ge species in the glassy network can be correlated with the density anomaly. Several structural mechanisms can be summarized by increasing of lithium carbonate in the lead-germanate glassy: i) depolymerization of germanate network; ii) conversion of 3- to 4-membered [GeO4] rings; iii) transformation of connected [GeO6] structural units into isolated [GeO6] structural units and a conversion part of higher to lower coordination number of germanium atoms. (C) 2016 Elsevier B.V. All rights reserved.
文章类型期刊论文
关键词Lithium-lead-germanate glasses Raman spectroscopy X-ray scattering analysis
DOI10.1016/j.jnoncrysol.2016.01.015
关键词[WOS]RAY-ABSORPTION SPECTROSCOPY ; PBO-GEO2 GLASSES ; EXAFS ; SCATTERING ; NEUTRON ; PROGRAM ; OXIDE ; RAMAN ; XAS
语种英语
WOS类目Materials Science, Ceramics ; Materials Science, Multidisciplinary
WOS记录号WOS:000372680800003
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/260276
专题多学科研究中心
作者单位中国科学院高能物理研究所
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Rada, M,Aldea, N,Wu ZH,et al. Evolution of the germanium-oxygen coordination number in lithium-lead-germanate glasses[J]. JOURNAL OF NON-CRYSTALLINE SOLIDS,2016,437:10-16.
APA Rada, M.,Aldea, N.,吴忠华.,张静.,Wu, ZH.,...&Bodnarchuk, V.(2016).Evolution of the germanium-oxygen coordination number in lithium-lead-germanate glasses.JOURNAL OF NON-CRYSTALLINE SOLIDS,437,10-16.
MLA Rada, M,et al."Evolution of the germanium-oxygen coordination number in lithium-lead-germanate glasses".JOURNAL OF NON-CRYSTALLINE SOLIDS 437(2016):10-16.
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