VIBRATIONAL ENTROPY OF ORDERED AND DISORDERED NI3AL

被引：116

作者：

ANTHONY, L

OKAMOTO, JK

FULTZ, B

机构：

[1] Division of Engineering and Applied Science, Mail 138-78, California Institute of Technology, Pasadena

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.70.1128

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have measured the difference in vibrational entropy of Ni3Al in two states of chemical order: as a disordered fcc solid solution, and as the equilibrium L l2 ordered structure. Data were obtained from three independent methods: low-temperature calorimetry, temperature-dependent x-ray diffractometry, and temperature-dependent extended electron energy-loss fine structure spectrometry. We estimate that at high temperatures, the vibrational entropy of chemically disordered Ni3Al is 0.3k(B)/atom greater than for ordered Ni3Al.

引用

页码：1128 / 1130

页数：3