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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >A neutron diffraction and ~(205)Tl NMR study of the thallium germanate glass system
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A neutron diffraction and ~(205)Tl NMR study of the thallium germanate glass system

机译：锗酸锗玻璃体系的中子衍射和〜（205）T1 NMR研究

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摘要

Neutron diffraction data, measured for two thallium germanate glass compositions, are presented and compared with previously published data for caesium germanate glasses. The measured coordination number, n_(Ge-O), for the 10 mol% Tl_2O thallium germanate glass is in good agreement with the average coordination number measured for the equivalent caesium germanate. However, while n_(Ge-O) declines for caesium germanate glasses as the amount of modifier increases above 18 mol% Cs_2O, n_(Ge-O) for the 30 mol% Tl_2O thallium germanate glass remains high with, on average, 4.40 ± 0.03 oxygen neighbours per germanium. The difference in behaviour of the germanium coordination, compared to caesium germanate glasses, arises from a change in the average thallium environment, as the role of the thallium changes from that of a modifier (similar to an alkali), to a role where some of the thallium atoms act as network formers. This is supported by ~(205)Tl NMR measurements which indicate the presence of two thallium environments.
机译：呈现了针对两种锗酸锗玻璃成分测量的中子衍射数据，并将其与先前公布的锗酸铯玻璃数据进行了比较。 10 mol％Tl_2O锗锗玻璃的测量配位数n_（Ge-O）与当量锗酸铯的平均配位数一致。但是，尽管锗酸铯玻璃的n_（Ge-O）随着改性剂的添加量增加到18 mol％Cs_2O以上而下降，但30摩尔％的Tl_2O锗锗玻璃的n_（Ge-O）仍然很高，平均为4.40±每个锗0.03个氧邻域。与german锗酸铯玻璃相比，锗配位行为的差异是由于the的平均作用从改性剂（类似于碱）改变到某些atoms原子充当网络形成者。这由〜（205）T1 NMR测量支持，该测量表明存在两种th环境。

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