Structure and magnetic properties in the La1-xEuxBaFeCuO5+δ system

被引：13
|
作者：
Er-Rakho, L
Nguyen, N [1 ]
Ducouret, A
Samdi, A
Michel, C
机构：
[1] ENSICAEN, CNRS, UMR 6508, Lab CRISMAT, F-14050 Caen, France
[2] Univ Hassan II, EMPM, Fac Sci Ain Chock, Casablanca, Morocco
来源：
SOLID STATE SCIENCES | 2005年 / 7卷 / 02期
关键词：
lanthanides mixed Fe-Cu double perovskite structure; distorted pyramidal iron environments; X-ray diffraction; Fe-57 Mossbauer spectroscopy; magnetic susceptibility; lattice EFG calculations;
D O I：
10.1016/j.solidstatesciences.2004.10.016
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The solid solution La1-xEuxBaFeCuO5+delta synthesized in air with 0 less than or equal to delta less than or equal to 0.13 was studied by X-ray diffraction, Fe-57 Mossbauer spectroscopy and susceptibility measurements. Double perovskite with YBaFeCuO5-type structure was observed except for x = 0 composition which has a cubic cell. Fe and Cu are generally in square pyramidal environments which differ by their distortion: axially compressed for Fe and elongated for Cu. Mossbauer studies showed the existence of pyramidal Fe3+, Fe3+y and octahedral Fe4+. Electric field gradient calculations allowed to better understand the origin of the distortion of the two pyramidal iron sites. (C) 2004 Elsevier SAS. All rights reserved.
引用
收藏
页码：165 / 172
页数：8
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