High-pressure modifications of CaZn2, SrZn2, SrAl2, and BaAl2: Implications for Laves phase structural trends

被引：24

作者：

Kal, Subhadeep ^{[1
,2
]}

Stoyanov, Emil ^{[1
]}

Belieres, Jean-Philippe ^{[1
]}

Groy, Thomas L. ^{[1
]}

Norrestam, Rolf ^{[3
]}

Haussermann, Ulrich ^{[1
]}

机构：

[1] Arizona State Univ, Dept Chem & Biochem, Tempe, AZ 85287 USA

[2] Indian Inst Technol, Dept Chem, Kharagpur 721302, W Bengal, India

[3] Stockholm Univ, S-10691 Stockholm, Sweden

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2008年 / 181卷 / 11期

关键词：

Polar intermetallic phases; CeCu2 structure type; High pressure; Laves phases; Electron concentration controlled structural stability;

D O I：

10.1016/j.jssc.2008.07.036

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

High-pressure forms of intermetallic compounds with the composition CaZn2, SrZn2, SrAl2, and BaAl2 were synthesized from CeCu2-type precursors (CaZn2, SrZn2, SrAl2) and Ba21Al40 by multi-anvil techniques and investigated by X-ray powder diffraction (SrAl2 and BaAl2), X-ray single-crystal diffraction (CaZn2), and electron microscopy (SrZn2). Their structures correspond to that of Laves phases. Whereas the dialuminides crystallize in the cubic MgCu2 (C15) structure, the dizincides adopt the hexagonal MgZn2 (C14) structure. This trend is in agreement with the structural relationship displayed by sp bonded Laves phase systems at ambient conditions. (C) 2008 Elsevier Inc. All rights reserved.

引用

页码：3016 / 3023

页数：8

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