Tetragonal low-temperature structure of LiAl

被引：13
|
作者：
Ehrenberg, H
Pauly, H
Knapp, M
Gröbner, J
Mirkovic, D
机构：
[1] Tech Univ Darmstadt, Inst Sci Mat, D-64287 Darmstadt, Germany
[2] TU Calusthal, Inst Met, D-38678 Clausthal Zellerfeld, Germany
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2004年 / 177卷 / 01期
关键词：
Zintl phase; LiAl; B32; high-resolution powder diffraction;
D O I：
10.1016/S0022-4596(03)00419-5
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The cubic face-centered structure of LiAl (Fd3m, a = 6.35971(3) Angstrom at 290 K) transforms into a tetragonal body-centered structure (I4(1)/amd, a = 4.47831(1) Angstrom, c = 6.34435(2) Angstrom at 12 K). This first-order phase transition at about 93(2) K during heating is probably the reason for the so-called "100 K anomalies" in some physical properties like specific heat, electrical resistivity and nuclear-spin lattice relaxation. This transition seems to be correlated with the composition Li:Al of the alloy and the amount of Li vacancies. (C) 2003 Elsevier Inc. All rights reserved.
引用
收藏
页码：227 / 230
页数：4
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