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Nanocrystalline NiFe 2 O 4 spinel ferrites with various grain sizes have been synthesized by ball milling the bulk NiFe 2 O 4 . The average grain sizes were estimated from the X-ray line broadening of the (311) reflection. The Neel temperatures of NiFe 2 O 4 for various grain sizes were determined by magneto thermogravimetric method. The magnetic behaviour...
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