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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 >Bulk crystallisation of (00l) oriented fresnoite Sr_2TiSi _2O_8 in glass-ceramics of the Sr-Ti-Si-K-B-O system
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Bulk crystallisation of (00l) oriented fresnoite Sr_2TiSi _2O_8 in glass-ceramics of the Sr-Ti-Si-K-B-O system

机译：在Sr-Ti-Si-K-B-O系统的玻璃陶瓷中（00l）取向贝氏体Sr_2TiSi _2O_8的本体结晶

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摘要

This paper shows that glass-ceramics containing highly surface and bulk preferentially oriented fresnoite Sr_2TiSi_2O_8 crystals can be synthesised by a simple isothermal heat treatment of suitable glass compositions in the Sr-Ti-Si-K-B-O system. For all tested compositions, crystallisation starts from the free surfaces of the specimens and propagates to bulk with time. If most of these compositions lead to (00l) preferential orientation at the specimens' surfaces, bulk crystal texture is very composition dependent. The effects of variation in K_2O and B_2O _3 contents on the crystallisation have been studied. It is shown that low K_2O and high B_2O_3 contents are required to keep the (00l) orientation from the surface into the bulk. This result seems to be explained by the viscosities of the initial and residual glasses at the temperature of crystallisation: a low viscosity leads to a fine and homogeneous microstructure with small and strongly (00l) bulk oriented crystals.
机译：本文表明，通过在Sr-Ti-Si-K-B-O系统中对合适的玻璃成分进行简单的等温热处理，可以合成出具有高表面和块状优先取向的方铁矿Sr_2TiSi_2O_8晶体的玻璃陶瓷。对于所有测试的组合物，结晶都从样品的自由表面开始，并随时间传播到大量。如果这些成分中的大多数导致样品表面的（00l）优先取向，则体晶织构非常依赖成分。研究了K_2O和B_2O_3含量的变化对结晶的影响。表明需要低K_2O和高B_2O_3的含量才能保持（00l）取向从表面到块体。这个结果似乎可以用结晶温度下的初始玻璃和残余玻璃的粘度来解释：低粘度导致细小且均质的微观结构，具有小的且牢固的（00l）块状取向晶体。

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