MAGNITUDE AND ORIGIN OF THE DIFFERENCE IN VIBRATIONAL ENTROPY BETWEEN ORDERED AND DISORDERED FE3AL

被引：72

作者：

ANTHONY, L

NAGEL, LJ

OKAMOTO, JK

FULTZ, B

机构：

[1] California Institute of Technology, 138-78 Pasadena

来源：

PHYSICAL REVIEW LETTERS | 1994年 / 73卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.73.3034

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The difference in vibrational entropy between chemically disordered and DO3-ordered Fe3Al was measured by calorimetry to be (0.10 ± 0.03) kB/atom at high temperatures, with the ordered alloy having the lower vibrational entropy. Analysis of the vibrational modes of the ordered and disordered alloys with a Born-von Kármán model showed that the lower vibrational entropy of the ordered alloy originates from high-frequency optical modes involving large-amplitude vibrations of the aluminum-rich sublattice. © 1994 The American Physical Society.

引用

页码：3034 / 3037

页数：4

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