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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 >Calorimetric studies on the crystallization of Li2S-B2O3 glasses
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Calorimetric studies on the crystallization of Li2S-B2O3 glasses

机译：Li2S-B2O3玻璃结晶的量热研究

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xLi(2)S . (1 - x)B2O3 system glasses have been prepared by liquid nitrogen quenching technique at a cooling rate of about 15 degrees C/s in the absence of water and oxygen. On the basis of Johnson-Mehl-Avrami equation, the isothermal and non-isothermal crystallization kinetics of xLi(2)S . (1 - x)B2O3 glasses have been studied using differential scanning calorimetry. The crystallization activation energy, E, Avrami exponent, n, and crystallization enthalpy, -Delta H, have been estimated. It is found that in xLi(2)S . (1 - x)B2O3 oxysulfide system, glasses can be formed within the composition range of x less than or equal to 0.45. The x = 0.25 glass shows the strongest stability against crystallization, while the x = 0.45 glass is the least stable composition among glass samples. The results indicate that the crystallization is a thermally activated process and it is mainly controlled by a surface nucleation mechanism. The activation energies of crystallization are maximal for glass samples with a particle size of 180-100 mu m. Crystallization enthalpy, -Delta H, and peak temperature, T-p, are linearly dependent. (C) 1998 Elsevier Science E.V. All rights reserved. [References: 38]
机译：xLi（2）S。 （1-x）B 2 O 3系统玻璃已经通过液氮淬火技术在不存在水和氧气的情况下以约15℃/ s的冷却速率制备。根据Johnson-Mehl-Avrami方程，xLi（2）S的等温和非等温结晶动力学。已经使用差示扫描量热法研究了（1-x）B 2 O 3玻璃。已经估计了结晶活化能E，Avrami指数n和结晶焓-ΔH。发现在xLi（2）S中。 （1-x）B 2 O 3的氧硫化物体系，可以在x的组成范围内形成小于或等于0.45的玻璃。 x = 0.25玻璃显示出最强的抗结晶稳定性，而x = 0.45玻璃是玻璃样品中最不稳定的成分。结果表明，结晶是一个热活化过程，它主要受表面成核机理控制。对于粒径为180-100微米的玻璃样品，结晶的活化能最大。结晶焓-ΔH和峰温度T-p线性相关。 （C）1998年Elsevier Science E.V.版权所有。 [参考：38]

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