Revisiting the germanate anomaly in glasses using nuclear forward scattering
收藏ESRF Portal2028-01-01 更新2026-04-23 收录
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https://doi.esrf.fr/10.15151/ESRF-ES-2200998901
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资源简介：
Oxide glasses based on germanium oxide (GeO₂) are structural analogues of archetypical SiO₂ glasses. Unlike silicates, germanate glasses show a nonmonotonic change in properties when modifiers (alkali oxides) are added, attributed to shifts in Ge coordination (4-, 5-, and/or 6-coordinated Ge) or changes in ring-structures. The dispute about the structural origin of these changes have been named the “germanate anomaly” and has attracted significant debate in the glass research community. Here, we revisit this by studying xK₂O-(100-x)GeO₂ glasses (x = 0, 11, 20, 33) and related crystalline polymorphs (GeO₂, K₂Ge₈O₁₇, K₂Ge₄O₉, K₂Ge₂O₅). Using the 73Ge nuclear transition at 68.7 keV, we suggest to apply Nuclear Forward Scattering (NFS) to analyze isomeric shifts, providing insights into Ge coordination. Comparing these between glassy and crystalline phases will offer a new perspective on the germanate anomaly, complementing existing scattering data and help settle the debate.
提供机构：
Aalborg University, Department of Chemistry and Bioscience, Fredrik Bajers Vej 7H, 9220, Aalborg, DENMARK; Universita di Padova, Dipartimento di Fisica e Astronomia G Galilei, Via F Marzolo 8, 35131 , Padova, ITALY; Aalborg University, Department of Chemistry and Bioscience, Fredrik Bajers Vej 7H, 9220 Aalborg, Denmark
创建时间：
2028-01-01
