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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 >Investigations of the non-isothermal crystallization of Bi _4Ge _3O _(12) (2:3) glasses
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Investigations of the non-isothermal crystallization of Bi _4Ge _3O _(12) (2:3) glasses

机译：Bi _4Ge _3O _（12）（2：3）玻璃的非等温结晶研究

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摘要

Amorphous Bi _4Ge _3O _(12) glass samples were produced by melt quenching procedure stating with Bi _4Ge _3O _(12) (BGO) powder, obtained by solid state reaction between oxides. The kinetics of non-isothermal crystallization of BGO nano-crystals has been investigated. Differential Thermal Analysis (DTA) can give the main parameters of crystallization with an exothermic peak from 813 K to 851 K depending on the heating rate, which was assigned to the crystallization of cubic BGO in the amorphous matrix and compared with the X-Ray Diffraction (XRD) patterns. The nano-crystal dimensions were calculated from the XRD patterns by using the Debye-Scherrer method and were compared with Transmission Electron Microscopy (TEM) images. It was shown that the Ozawa model is most suitable for describing the behavior of non-isothermal crystallization of BGO nano-crystals within the glass matrix. Experimental results suggest a disk-shape type growth mechanism for the Bi _4Ge _3O _(12) nano-crystallites. The Flynn-Wall-Ozawa method has shown that the average activated energy value is 385 ± 14 kJ/mol which was computed within the same model and agrees very well with the activation energy of the crystallization.
机译：通过熔融淬火程序生产了非晶态Bi _4Ge _3O _（12）玻璃样品，并指出通过氧化物之间的固相反应获得的Bi _4Ge _3O _（12）（BGO）粉末。研究了BGO纳米晶体的非等温结晶动力学。差热分析（​​DTA）可以根据加热速率提供主要结晶参数，其放热峰的范围为813 K至851 K，这取决于非晶态基质中立方BGO的结晶并与X射线衍射进行了比较。 （XRD）模式。使用Debye-Scherrer方法从XRD图案计算出纳米晶体的尺寸，并将其与透射电子显微镜（TEM）图像进行比较。结果表明，Ozawa模型最适合描述玻璃基体内BGO纳米晶体的非等温结晶行为。实验结果表明Bi _4Ge _3O _（12）纳米微晶呈盘状生长机制。 Flynn-Wall-Ozawa方法显示，平均活化能值为385±14 kJ / mol，该值是在同一模型中计算得出的，与结晶的活化能非常吻合。

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