Magnetic properties of the mixed spinel Co1+x Si x Fe2−2x O4 |
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Authors: | S S Shinde K M Jadhav G K Bichile Bimal S Trivedi R G Kulkarni |
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Affiliation: | (1) Department of Physics, Dr B A Marathwada University, 431 004 Aurangabad, India;(2) Department of Physics, Saurashtra University, 360 005 Rajkot, India |
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Abstract: | The structural and magnetic properties of the mixed spinel Co1+x Si x Fe2?2x O4 system for 0·1≤x≤0·6 have been studied by means of X-ray diffraction, magnetization, and Mössbauer spectroscopy measurements. X-ray intensity calculations indicate that Si4+ ions occupy only tetrahedral (A) sites replacing Fe3+ ions, and the added Co2+ ions substitute for (B) site Fe3+ ions. The Mössbauer spectra at 300 K have been fitted with two sextets in the ferrimagnetic state corresponding to Fe3+ at the A and B sites, forx≤0·3. The Mössbauer intensity data shows that Si possesses a preference for the A site of the spinel. The variation of the saturation magnetic moment per formula unit measured at 300 K with the Si content, is explained on the basis of Neel’s collinear spin ordering model forx≤0·3 which is supported by Mössbauer, and X-ray data. The Curie temperature decreases nearly linearly with increase of the Si content, forx=0·1–0·6. |
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Keywords: | Magnetic properties mixed spinel Co1+x Si x Fe2− 2x O4 |
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