期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 183, 期 7, 页码 1582-1587出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2010.04.041
关键词
Hydrothermal synthesis; Perovskites; Magnetic property; Superexchange interaction
资金
- National Nature Science Foundation of China
Hydrothermal synthesis, characterization and magnetic properties of a series of ABO(3)-perovskites LaFe1-xCrxO3 (0 <= x <= 1) are reported. The alkalinity in initial reaction mixtures plays a critical role in controlling the designed stoichiometry of the final compositions. Their magnetic properties are strongly dependent on the compositions and a maximum magnetic moment is found for the sample at x=0.5. Weak ferromagnetic interaction observed for the samples from x=0 to 0.9 arises from the presence of Fe-O-Fe antisymmetric exchange and Fe-O-Cr superexchange interaction. The weak ferromagnetism as well as the linear variation of the lattice parameters implies the possible random distribution of Fe and Cr ions in B sites of the perovskites. The evolution of magnetic ordering transition temperatures has a close relationship with substituent ratios, for the competition of antiferromagnetism and ferromagnetism. The saturated magnetic moment shows a great improvement compared with that for the samples synthesized by solid state method. (C) 2010 Elsevier Inc. All rights reserved.
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