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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 >Non-isothermal crystallization kinetics of La_2CaB _(10)O_(19) from glass
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Non-isothermal crystallization kinetics of La_2CaB _(10)O_(19) from glass

机译：玻璃中La_2CaB_（10）O_（19）的非等温结晶动力学

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摘要

The non-isothermal crystallization kinetics of La_2CaB _(10)O_(19) (LCB) from a La_2O_3-CaO-B _2O_3 glass was studied. Differential thermal analysis methods were performed on three glass powders to obtain the kinetic parameters of LCB crystallization mechanism. The activation energies for overall crystallization (E), obtained by the methods of Kissinger and Ozawa, were in the range of 479-569 kJ/mol. Multiple (five) analysis methods were used to estimate the Avrami exponent (n), which could consequently be reduced into the single value of n = 3.1 ± 0.3. The growth morphology index (m) of LCB was corroborated by microscopy (optical and electron) images, which revealed a three dimensional growth. Energy dispersive spectroscopy confirmed that LCB is the crystallizing phase from the glass by an interface controlled mechanism. The parameters of the Johnson-Mehl-Avrami kinetic model for the analysis of LCB crystallization from glass were found to be n = m = 3.
机译：研究了La_2O_3-CaO-B _2O_3玻璃中La_2CaB _（10）O_（19）（LCB）的非等温结晶动力学。对三种玻璃粉末进行了差示热分析，得到了LCB结晶机理的动力学参数。通过Kissinger和Ozawa的方法获得的用于总体结晶的活化能（E）在479-569kJ / mol的范围内。使用多种（五种）分析方法来估计Avrami指数（n），因此可以将其减小为n = 3.1±0.3的单个值。 LCB的生长形态指数（m）通过显微镜（光学和电子）图像得到证实，该图像显示了三维生长。能量色散光谱法通过界面控制机制证实了LCB是玻璃的结晶相。用于分析玻璃中LCB结晶的Johnson-Mehl-Avrami动力学模型的参数为n = m = 3。

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