57Fe Mossbauer investigation of K0.3Ba0.7Fe2S3

被引：3

作者：

Reissner, A

Steiner, W

Boller, H

机构：

[1] Vienna Univ Technol, Inst Festkorperphys, A-1040 Vienna, Austria

[2] Johannes Kepler Univ Linz, Inst Chem, A-4040 Linz, Austria

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2004年 / 383卷 / 1-2期

关键词：

iron sulphides; (Ba; K)Fe2S3; Mossbauer spectroscopy; mixed valence;

D O I：

10.1016/j.jallcom.2004.04.022

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：

Fe-57 Mossbauer investigations are reported for K0.3Ba0.7Fe2S3 and compared with the unsubstituted compound BaFe2S3 in the temperature interval 4.2 < T < 293 K. According to the temperature dependence of the quadrupole splitting and the value of the centre shift (CS) both samples can be characterised as mixed valence compounds. A weakening in stiffness of the Fe sublattice follows from the decrease in Debye temperature (30 K), if Ba is substituted by K. The ordering temperature, determined from the appearance of a magnetic hyperfine split component, is roughly 40 K lower than the one for BaFe2S3 indicating a strong influence of the interspersed cations on the magnetic exchange interaction. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：131 / 134

页数：4

共 8 条

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