Fluctuation in occupancy of Cu2+ ions in Zn- and Cd-substituted Cu-ferrites |
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Authors: | M Siddique Rao Tahir Ali Khan M Shafi |
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Institution: | (1) Physics Division Pakistan Institute of Nuclear Science and Technology, PINSTECH, P.O. Nilore, Islamabad, Pakistan |
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Abstract: | Mössbauer effect technique has been used for the comparative study of Cu1?x Zn x Fe2O4 and Cu1?x Cd x Fe2O4 ( x = 0.0?1.0) ferrites. Both Zn2+ and Cd2+ cations are divalent, non-magnetic ions with different ionic radii. With the substitution of these non-magnetic cations the average internal magnetic field decreases and paramagnetic behavior is dominated at x = 0.7 in both series. It is observed that the occupancy of Cu2+ ions for tetrahedral site is not constant for all compositions but fluctuate between 8–15%. It is also found that Cu2+ ions have more preference for tetrahedral site in Cu-Zn system as compared to the Cu-Cd system. Zn2+ and Cd2+ both ions occupy tetrahedral site completely and form normal spinels for x = 1.0. |
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