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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 >Glass transition temperature and devitrification study of barium germanate glasses
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Glass transition temperature and devitrification study of barium germanate glasses

机译：锗酸钡玻璃的玻璃化温度和失透研究

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摘要

The devitrification of barium germanate glasses, examined by differential thermal analysis (DTA), Fourier transform infrared spectroscopy and X-ray diffraction, is reported. The glass compositions are expressed by the general formula: xBaO .(1-x)GeO2 with x=0.05, 0.10, 0.20, 0.30 and 0.40. Glass transition temperature and density values are not linearly changed by the increase of BaO content but pass through a maximum at x=0.20. The composition with x=0.05 exhibits two glass transition temperatures, Phases crystallizing during DTA were identified and the crystallization mechanisms were related to these structures. Bulk crystal nucleation is dominant for the first four compositions of the studied series of glasses. BaGe4O9 is the only crystallizing phase for x=0.05, 0.10, 0.20 and the main one for x=0.30. The composition with x=0.40 devitrifies only from surface and BaGe2O5 and BaGeO3 crystals were found.
机译：报道了通过差热分析（​​DTA），傅里叶变换红外光谱和X射线衍射检查的锗酸钡玻璃的失透。玻璃组成用通式xBaO·（1-x）GeO2表示，x = 0.05、0.10、0.20、0.30和0.40。玻璃化转变温度和密度值不会随BaO含量的增加而线性变化，而是在x = 0.20时达到最大值。 x ＝ 0.05的组成表现出两个玻璃化转变温度，在DTA期间鉴定出结晶相，并且结晶机理与这些结构有关。在所研究的系列玻璃的前四个成分中，体晶成核作用占主导。 BaGe 4 O 9是x ＝ 0.05、0.10、0.20的唯一结晶相，而x ＝ 0.30是主要的结晶相。 x ＝ 0.40的组成仅从表面失透，并且发现BaGe 2 O 5和BaGeO 3晶体。

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