A Mossbauer spectroscopy investigation of SrFe1-xScxO3-δ perovskites

被引：5
|
作者：
Rizki, Youssef [1 ]
Le Breton, Jean-Marie [1 ]
Folcke, Emeric [1 ]
Lechevallier, Luc [1 ]
Breard, Yohann [2 ]
Maignan, Antoine [2 ]
机构：
[1] Univ Rouen, Grp Phys Mat, CNRS, UMR 6634, F-76801 St Etienne, France
[2] CNRS, ENSICAEN, Lab CRISMAT, UMR 6508, F-14050 Caen 4, France
来源：
SOLID STATE SCIENCES | 2010年 / 12卷 / 05期
关键词：
Perovskites; SrFeO3; Mossbauer spectroscopy; Valence state of iron; Oxygen deficiency; OXYGEN NONSTOICHIOMETRY; MAGNETORESISTANCE;
D O I：
10.1016/j.solidstatesciences.2010.02.027
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Polycrystalline samples of oxygen deficient perovskites SrFe1-xScxO3-delta (0 <= x <= 0.5) have been synthesized by direct solid state reactions. Each compound has been stabilized with two different oxygen stoichiometries. The structural study shows, firstly, the good cationic homogeneity of the samples and, secondly, that the Sc and Fe atoms are randomly distributed over the same crystallographic site, whatever the scandium content. This implies that no anionic order is possible. A detailed Mossbauer spectroscopy study clearly shows that the substitution of scandium for iron involves an oxygen content decrease which decreases the tetravalent iron content until its total disappearance for x=0.5. The evolutions of the isomer shift, the quadrupolar splitting and the relative intensity versus the Sc3+ content are depicted in the present paper. (C) 2010 Elsevier Masson SAS. All rights reserved.
引用
收藏
页码：739 / 744
页数：6
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