Temperature Dependent EXAFS Study of Chromium-Doped GaFeO3 at Gallium and Iron Edges

被引：12

作者：

Basu, S. ^{[1
]}

Singh, Ripandeep ^{[2
]}

Das, A. ^{[2
]}

Roy, T. ^{[3
]}

Chakrabarti, A. ^{[3
,4
]}

Nigam, A. K. ^{[5
]}

Jha, S. N. ^{[1
]}

Bhattacharyya, D. ^{[1
]}

机构：

[1] Bhabha Atom Res Ctr, Atom & Mol Phys Div, Bombay 400085, Maharashtra, India

[2] Bhabha Atom Res Ctr, Solid State Phys Div, Bombay 400085, Maharashtra, India

[3] Raja Ramanna Ctr Adv Technol, Homi Bhabha Natl Inst, Indore 452013, Madhya Pradesh, India

[4] Raja Ramanna Ctr Adv Technol, Indus Synchrotrons Utilisat Div, Indore 452013, Madhya Pradesh, India

[5] Tata Inst Fundamental Res, Dept Condensed Matter Phys & Mat Sci, Bombay 400005, Maharashtra, India

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2015年 / 119卷 / 04期

关键词：

MAGNETIC-PROPERTIES;

D O I：

10.1021/jp508103x

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：

We report the results of EXAFS measurements on undoped and Cr-doped GaFeO3 samples both at Ga and Fe K edges at various temperatures in the regime of 25-300 K, to explore the changes in local structure surrounding the cations (viz., Ga and Fe) in GaFeO3 due to Cr substitution and across its magnetic transition temperature. The EXAFS results along with neutron diffraction studies and theoretical simulations establish the mechanism of Cr substitution in the GaFeO3 lattice in a microscopic scale. The decrease in the paramagnetic-ferrimagnetic transition temperature (T-C) and the saturation magnetization observed in the samples with increase in Cr doping concentration, has been attributed to the decrease of Fe and concomitant increase of Cr in Ga2 site. The bond lengths at both Fe and Ga sites exhibit changes at the magnetic transition temperatures, indicating enhanced cationic site disorder, which also explains the reported dielectric anomalies observed in these samples at the magnetic transition temperatures.

引用

页码：2029 / 2037

页数：9

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