| 量热法研究Li2S—B2O3玻璃晶化动力学 |
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| 引用本文： | 谢贤宁,周园.量热法研究Li2S—B2O3玻璃晶化动力学[J].盐湖研究,1998,6(4):20-27. |
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| 作者姓名： | 谢贤宁 周园 |
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| 作者单位： | 中国科学院青海盐湖研究所!西宁，810008 |
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| 摘 要： | 采用惰性气体保护下的高温熔融反应及氮淬冷技术，制备了xLI2S·（1—X）B2O23玻璃。利用DSC量热法研究了玻璃的非等温晶化动力学，计算得到晶化活化能E，Avrami指数n及晶化热—△H等动力学参数。实验发现，xLi2S·（1—X）B2O3硫氧化物能在X≤0．45的区域形成玻璃，x=0．25玻璃组份具有最强的抗晶化能力，而x=0．45玻璃组份最易晶化。玻璃的晶化为一热激活过程，且主要由表面成核机理控制。玻璃晶化活化能在180—100μm颗粒范围有最大值，晶化热—△H与峰值温度Tp满足线性关系。
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| 关 键 词： | 晶化动力学 量热法 Li_2—B_2O_3玻璃 |
Calorimetric Studies on the Crystallization Kinetics of Li_2S-B_2O_3 Glasses |
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| Xie Xianning,Zhou Yuan,Gao Haichun,Sun Changming,Huo Yan.Calorimetric Studies on the Crystallization Kinetics of Li_2S-B_2O_3 Glasses[J].Journal of Salt Lake Research,1998,6(4):20-27. |
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| Authors: | Xie Xianning Zhou Yuan Gao Haichun Sun Changming Huo Yan |
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| Abstract: | xLi2S·(1-x)B2O3 glasses were prepared by high temperature melting reaction and liquid nitrogen quenching technique under inert gas atmosphere. The non-isothermal crystallization kinetics of the glasses was studied via differential scanning calorimetry (DSC)method,and the crystallization activation energy, E, Avrami exponent, n, crystallization enthalpy, -△H, were estimated. It is found that in xLi2S·(1-x)B2O3 oxysulfide system, glasses can be formed within the composition range of x≤0. 45. The x=0. 25 glass shows the strongest stability againgst crystallization,while the x=0. 45 glass is the least stalble composition among glass samples. The crystllization is a thermally activated process,and it is mainly controlled by a surface nucleation mechanism. The Activation energy is maximal at particle size of 180-100μm. Crystallization enthalpy, -△H,and peak temperature,Tp. are linearly dependent. |
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| Keywords: | Crystallization kinetics Calorimetric method Li_2S-B_2O_3 glasses |
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