Ternary rare-earth zinc arsenides REZn2As3 (RE=La-Pr) containing defect fluorite-type slabs

被引：7

作者：

Lin, Xinsong ^{[1
]}

Stoyko, Stanislav S. ^{[1
]}

Mar, Arthur ^{[1
]}

机构：

[1] Univ Alberta, Dept Chem, Edmonton, AB T6G 2G2, Canada

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2013年 / 199卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Rare earths; Arsenides; Crystal structure; Electronic structure; SYMMETRY-BREAKING TRANSITIONS; CRYSTAL-STRUCTURE; ELECTRICAL-PROPERTIES; MAGNETIC-PROPERTIES; CAAL2SI2; STRUCTURE; AB2X2; COMPOUNDS; LANDAU THEORY; HFCUSI2; TYPE; LA-ND; SM;

D O I：

10.1016/j.jssc.2012.12.026

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The ternary rare-earth zinc arsenides REZn2As3 (RE=La-Pr) have been prepared by reactions of the elements at 800 degrees C. They adopt new tetragonal structure types, with the La member (space group I4/mmm, Z=4, a=4.1133(2) angstrom, c=32.1246(14) angstrom) differing from the Ce and Pr members (space group P4/nmm, Z=2, a=4.0804(6)-4.0534(12) angstrom, c=16.089(5)-16.059(10) angstrom, respectively) in the disposition of RE-centred square antiprisms on opposite sides of square As nets. The structures contain thick anionic slabs, built from edge-sharing ZnAs4 tetrahedra, that can be considered either as stackings of three PbO-type layers or as fragments of the fluorite-type structure. These slabs are deficient in Zn and are reminiscent of the same features in binary arsenide Zn3As2. LaZn2As3 exhibits temperature-independent paramagnetism whereas CeZn2As3 follows modified Curie-Weiss behavior consistent with Ce3+ species but with no occurrence of long-range ordering. (C) 2013 Elsevier Inc. All rights reserved.

引用

页码：189 / 195

页数：7

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