Structural Analysis of Eu2Mn2/3Ta 4/3O7 with a Pyrochlore-Related Structure

被引：0

作者：

陈刚

Satoh Hirohisa

Kamegashira Naoki

机构：

[1] Japan

[2] Toyohashi 441-8580

[3] Department of Applied Chemistry

[4] Toyohashi University of Technology

[5] Tempaku-cho

[6] Department of Materials Science

[7] Department of Materials Science Harbin Institute of Technology

[8] Harbin 150001

[9] Chin

来源：

Journal of Rare Earths | 2004年 / 01期

关键词：

complex oxide; structural analysis; X-ray diffraction; rare earths;

D O I：

暂无

中图分类号：

O614 [金属元素及其化合物];

学科分类号：

070301 ; 081704 ;

摘要：

Eu 2Mn 2/3Ta 4/3O 7 specimen was synthesized from Eu 2O 3, MnO and Ta 2O 5 in a reducing atmosphere. Structure analysis was carried out by Rietveld method from X-ray diffraction data. The X-ray diffraction profile calculated with monoclinic C2/c model was in a good agreement with the observed X-ray diffraction patterns since several small peaks of super lattice could be also assigned with C2/c symmetry in addition to fundamental reflection peaks. Eu 2Mn 2/3Ta 4/3O 7 has two kinds of distorted (Mn, Ta)O 6 octahedra and HTB layers, which deviates from the regular forms. Europium atoms coordinate to eight or seven oxygen atoms and lead to two kinds of polyhedra, EuO 8 and EuO 7 in this compound.

引用

页码：172 / 174

页数：3