Effect of atomic order on some physical properties of Co25Pt75
Effect of atomic order on some physical properties of Co25Pt75
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DOI：
10.1016/0925-8388(95)02046-2
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发表时间：
1996-02
影响因子：
6.2
通讯作者：
S. Jen
中科院分区：
文献类型：
--
作者：
S. Jen
采用感应熔炼法制备了Co25 Pt 75合金。为了在样品中实现不同程度的原子有序，采用退火和淬火技术。我们感兴趣的是研究原子有序性如何影响CoPt 3的物理性质，如晶格常数，热膨胀系数，比热和电阻率。发现在CoPt 3中，f.c.c.晶格各向同性膨胀。相应地，当温度升高到有序-无序转变温度Tx以上时，样品长度收缩。高温电阻率和比热数据都表明CoPt 3系统不具有间隙型行为。在Tx附近，以及长程有序，CoPt 3中可能存在短程有序，如从电阻率测量所暗示的。
Co25Pt75alloy was made by the induction melting method. In order to achieve various degrees of atomic order in the sample, annealing and quenching techniques were employed. We are interested in studying how atomic order would affect the physical properties of CoPt3, such as its lattice constant, thermal expansion coefficient, specific heat, and electrical resistivity. It is found that, on ordering in CoPt3the f.c.c. lattice expands isotropically. Correspondingly, the sample length shrinks when temperature is raised above the order—disorder transition temperature Tx. Both the high temperature resistivity and the specific heat data indicate that the CoPt3system does not have a gap-type behaviour. Around Tx, as well as the long-range order, there may exist a short-range order in CoPt3, as implied from the resistivity measurement.