NEW TERNARY AND QUATERNARY METAL-HYDRIDES WITH K2PTCL6-TYPE STRUCTURES

被引：57

作者：

HUANG, B ^{[1
]}

BONHOMME, F ^{[1
]}

SELVAM, P ^{[1
]}

YVON, K ^{[1
]}

FISCHER, P ^{[1
]}

机构：

[1] ETH ZURICH,NEUTRONENSTREUUNG LAB,CH-5232 VILLIGEN,SWITZERLAND

来源：

JOURNAL OF THE LESS-COMMON METALS | 1991年 / 171卷 / 02期

关键词：

D O I：

10.1016/0022-5088(91)90152-T

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 ternary alkaline earth transition metal hydrides Ca2FeH6, Sr2FeH6, Eu2FeH6, Mg2RuH6, Mg2OsH6 and Ca2OsH6 were synthesized from metal mixtures at 450-500-degrees-C and 70-130 bar H-2 pressure. They crystallize with the f.c.c. K2PtCl6 structure type and contain octahedral [TH6]4- (T = Fe, Ru, Os) hydride complexes with bond distances [T-D] = 1.618(5) angstrom (Ca1.98Mg0.02FeD6), 1.673(4) angstrom (Mg2RuD6), 1.682(2) angstrom (Mg2OsD6) and 1.728(5) angstrom (Ca1.92Mg0.08OsD6) as refined from neutron powder diffraction of magnesium-containing deuterides. In systems containing two alkaline earth elements quaternary hydrides with primitive cubic structures are formed in which the alkaline earth atoms are ordered. Preliminary neutron data on iron-based CaMgFeD6 and nickel-based CaMgNiD4 confirm the presence of octahedral [FeD6]4- and tetrahedral [NiD4]4- complexes respectively.

引用

页码：301 / 311

页数：11

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