Mössbauer and magnetic study of Mn2+- and Cr3+-substituted spinel magnesioferrites of the composition Mg1−xMnxFe2−2xCr2xO4 |
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| Authors: | H. M. Widatallah I. A. Al-Omari A. M. Gismelseed O. A. Yassin A. D. Al-Rawas M. E. Elzain A. A. Yousif O. A. Osman |
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| Affiliation: | (1) Depertment of Physics, Sultan Qaboos University, P. O. Box 36, Muscat 123, Oman;(2) School of Physics, Al-Neelain University, P. O. Box 12702, Khartoum, Sudan;(3) Physics Department (Fac. of Ed.), University of Khartoum, P. O. Box 123, Khartoum, Sudan |
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| Abstract: | Chromium and manganese co-substituted spinel magnesioferrites of the composition Mg1?x Mn x Fe2?2x Cr2x O4 (x?=?0.0, 0.1, 0.2, 0.3, and 0.5) were investigated with X-ray diffraction (XRD), Mössbauer spectroscopy and magnetic measurements. The cation distribution inferred suggests that Mn2+ and Cr3+ ions dominantly occupy the A- and B-sites respectively. The gradual decrease of the hyperfine fields and Curie temperatures with increasing x reflects a gradual weakening in the AB exchange interaction. Mössbauer data of the sample with x = 0.5 is suggestive of cation clustering and/or superparamagnetism. The magnetization data is suggestive of Yafet-Kittel-type canted magnetism. |
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| Keywords: | M?ssbauer spectroscopy spinel ferrites magnetization |
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