The Néel temperature of Ni0.5Zn0.5Fe2O4 spinel ferrite increases significantly from 538K in the bulk state to 592K when the grain size is reduced to 16nm by milling in a high-energy ball mill. This has been attributed to an increase in the AB superexchange interaction strength due to a possible enhancement in the magnetic ion concentration in the A-site on milling, as is evident from extended x-ray absorption fine structure and in-field Mössbauer measurements.
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Ponpandian et al. (2005) studied this question.
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