| 机械合金化合成CoSb3过程中的固相反应机理的热力学解释 |
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| 引用本文： | 刘玮书,张波萍,李敬锋,刘 静.机械合金化合成CoSb3过程中的固相反应机理的热力学解释[J].物理学报,2006,55(1):465-471. |
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| 作者姓名： | 刘玮书 张波萍 李敬锋 刘 静 |
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| 作者单位： | (1)北京科技大学材料科学与工程学院无机非金属材料系，北京 100083; (2)清华大学材料科学与工程系新型陶瓷与精细工艺国家实验室，北京 100084 |
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| 基金项目： | 国家自然科学基金(批准号：50310353，50325207)，清华-丰田汽车国际合作研究(批准号：0307J36)资助的课题. |
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| 摘 要： | 用Co和Sb作为初始原料，通过机械合金化(mechanical alloying, MA)的方法合成了CoSb3,并系统研究了MA转速和MA时间对MA过程中固相反应的影响.XRD结果表明，相同MA转速下，CoSb3的量随MA时间的延长而增多，但是MA时间过长会导致大量CoSb2的生成，甚至诱发CoSb3分解为CoSb2和非晶态Sb.而提高MA转速，只能缩短固相反应的发生时间，而不会改变整个固相反应
关键词：
机械合金化
热电材料
3')" href="#">CoSb3
非平衡热力学
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| 关 键 词： | 机械合金化 热电材料 CoSb3 非平衡热力学 |
| 文章编号： | 1000-3290/2006/55(01)/0465-07 |
| 收稿时间： | 2/2/2005 12:00:00 AM |
| 修稿时间： | 2005-02-022005-05-31 |
Thermodynamic explanation of solid-state reactions in synthesis process of CoSb3 via mechanical alloying |
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| Liu Wei-Shu,Zhang Bo-Ping,Li Jing-Feng and Liu Jing.Thermodynamic explanation of solid-state reactions in synthesis process of CoSb3 via mechanical alloying[J].Acta Physica Sinica,2006,55(1):465-471. |
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| Authors: | Liu Wei-Shu Zhang Bo-Ping Li Jing-Feng and Liu Jing |
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| Institution: | 1 School of Materials Science and Engineering, Belling University of Science and Technology, Beijing 100083, China; 2 State Kay Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | CoSb3 powders were synthesized by mechanical alloying (MA) with Co and Sb powders as starting materials. The influence of milling speed and duration on the solid reaction were systematically studied. The XRD results indicated that the CoSb3 phase increased with prolonged MA-time, but extensive MA resulted in the appearance of CoSb2 and the decomposition of CoSb3 to CoSb2 and amorphous Sb at a constant MA-speed. Increasing the MA-speed can shorten the incubation time of the reaction, but doesn't influence the MA solid reactions themselves. For MA processes that give a specific state of alloying, the MA-speed and the MA-time should satisfy the relationship: ω3.8t=C(constant), which expresses the relationship of equivalency between MA-speed and MA-time, indicating that the supplied energy is being accumulated during MA. The MA mechanism concerning the formation of CoSb3 has been discussed on the basis of MA from a viewpoint of non-equilbrium thermodynamics. |
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| Keywords: | mechanical alloying thermoelectric material CoSb3 non-equilibrium thermodynamics |
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