| Autor: |
Shinde, S S, Jadhav, K M, Bichile, G K, Trivedi, Bimal S, Kulkarni, R G |
| Zdroj: |
Bulletin of Materials Science; October 1998, Vol. 21 Issue: 5 p409-413, 5p |
| Abstrakt: |
The structural and magnetic properties of the mixed spinel Co1+xSixFe2−2xO4system 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. |
| Databáze: |
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