期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 196, 期 -, 页码 362-366出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2012.06.042
关键词
Solid state reaction; Magnetic; Perovskite
资金
- National Science Foundation of China
- National Science Foundation of Jiangsu Province of China [BK2010421]
- Foundation for Climax Talents Plan in Six-Big Fields of Jiangsu Province of China [1107020070]
High quality Gd-doped YFeO3 polycrystalline samples were synthesized by solid-state reaction method. The crystal structure of the samples can be described by the space group of Pbnm (No. 62). Fe-57 Mossbauer spectra show that only the high spin Fe3+ exists and the samples are magnetic ordering at room temperature. The spontaneous magnetization at room temperature was observed and the paramagnetic contribution from Gd3+ ions was confirmed by the significant enhancement of the magnetization. Temperature-dependent magnetization data correlate with the Gd concentration x and follow the Curie-Weiss law above the ferromagnetic transition temperature. Magnetic measurements suggest that the substitution of Y3+ ions by Gd3+ ions effectively enhance the magnetization of YFeO3. This is achieved by the additional Gd-Gd interactions, Gd-Fe interactions and the variation of Fe-O-Fe superexchange bond caused by distortion of the crystal structure. (C) 2012 Elsevier Inc. All rights reserved.
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