STRUCTURE AND PROPERTIES OF GD2XC (X = CL, BR, I)

被引：28

作者：

BAUHOFER, C

MATTAUSCH, H

MILLER, GJ

BAUHOFER, W

KREMER, RK

SIMON, A

机构：

[1] Max-Planck-Institut für Festkörperforschung, D-7000 Stuttgart 80, Heisenbergstr. I

来源：

JOURNAL OF THE LESS-COMMON METALS | 1990年 / 167卷 / 01期

关键词：

D O I：

10.1016/0022-5088(90)90290-Z

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The new compounds Gd2XC (X Cl, Br, I) were prepared from GdX3, Gd, graphite by heating in sealed tantalum capsules at 1250 to 1500 K. X-ray investigations (Gd2IC, single crystal, P63/mmc, a = 380.10(3) pm, c = 1479.2(2) pm, 135 symmetry-independent reflections, R = 0.048; Gd2BrC, powder, isotypic with Gd2IC, a = 378.58(5) pm, c = 1420.9(2) pm; Gd2ClC, powder, R3̄m, a = 369.02(2) pm, c = 2030.8(1) pm) show Gd-C-Gd layers to be connected via layers of X atoms. The chlorine atoms are coordinated trigonal antiprismatically and bromine and iodine atoms prismatically. The different environments are discussed in terms of the larger polarizabilities of Br- and I- ions (larger extent of X p-d-mixing). Bonding is analysed via extended-Hückel band structure calculations. All compounds are metallic. Gd2ClC orders antiferromagnetically at 32 K, Gd2BrC and Gd2IC ferromagnetically at 110 K and 182 K respectively. © 1990.

引用

页码：65 / 79

页数：15

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