期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 22, 期 35, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/22/35/356001
关键词
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资金
- DST, New Delhi under Indo-Italian POC
- CSIR, India
Bismuth ferrite ceramics (BiFeO3) are multifunctional materials classified as multiferroics for their special magnetic and electric properties that can be modified by substitutional doping at the Bi and/or Fe sites. Understanding the relation between magnetoelectric response and structural/electronic modification upon doping is a relevant issue. In this work, the structure of Eu-doped multiferroic systems (Bi1-xEuxFeO3, x = 0, 0.5, 0.1, 0.15) as well as the valence state of Fe and Eu ions have been investigated combining Mossbauer and x-ray absorption fine structure (XAFS) spectroscopy techniques. The Eu3+ doping at the Bi site results in better magnetic properties. High temperature Fe-57 Mossbauer data and Fe K-edge XAFS results show that FeO6 octahedron distortions reduce with Eu3+ doping. It is conclusively shown that the observed magnetic properties in BiFeO3 with chemical substitution (Eu) are mainly due to the structural distortions and not due to Fe multiple valence. Eu-151 Mossbauer measurements show that the Eu3+(Bi3+) site is magnetically inactive in BiFeO3.
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