Modulated structure of Ba6ZnIr4O15; A comparison with Ba6CuIr4O15 and SrMn1-xCoxO3-y

被引：41

作者：

Battle, PD ^{[1
]}

Blake, GR ^{[1
]}

Darriet, J ^{[1
]}

Gore, JG ^{[1
]}

Weill, F ^{[1
]}

机构：

[1] ICMCB,CHATEAU BRIVAZAC,F-33608 PESSAC,FRANCE

来源：

JOURNAL OF MATERIALS CHEMISTRY | 1997年 / 7卷 / 08期

关键词：

D O I：

10.1039/a700964j

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 phase Ba6CuIr4O15 has been shown by powder X-ray diffraction to be a member of the perovskite-related structural family A(3n+3)A(n)'Bn+3O6n+9 with n = 1; space group R32, a = 10.1196(3), c = 13.4097(4) Angstrom. The trigonal-prismatic A' sites and the octahedral B sites are both occupied by a disordered distribution of Ir and Cu. A combination of electron microscopy and X-ray diffraction has shown that Ba6ZnIr4O15 has a related incommensurate structure with a approximate to 10.1, c approximate to 4.4 Angstrom and a modulation vector q = a*+0.35c*. Alternatively, Ba6ZnIr4O15 can be considered as a composite of trigonal (cell 1) and rhombohedral (cell 2) substructures with a(1) = a(2) = 10.1228(9) c(1) = 4.4099(6), c(2) = 2.6982(2) Angstrom. It is shown that the same structural formalism can be used to describe the incommensurate hexagonal phase of SrMn1-xCoxO3-y.

引用

页码：1559 / 1564

页数：6

共 32 条

[1] AN INVESTIGATION OF NON-STOICHEIOMETRY IN THE SYSTEMS SRFEO3-Y AND SRCOO3-Y BY IRON AND COBALT K-EDGE EXTENDED X-RAY ABSORPTION FINE-STRUCTURE SPECTROSCOPY [J].