Abstract
Herein, the effect of substituting tetravalent zirconium (Zr4+) for trivalent iron (Fe3+) on the magnetic properties of nickel ferrite, derived from nanocrystalline powders, is probed. Via a tartrate-gel method, NiFe2O4 and zirconium-doped nickel ferrite (NiFe1.8Zr0.2O4) nanopowders have been synthesized and are well-characterized using XRD and TEM techniques. Subsequently, as-synthesized nanopowders were compacted and sintered at high temperature (1200 °C for 2 h) to attain high density ceramic products. Using XRD, SEM, and VSM techniques, further characterizations were made on the sintered products to assess their phase stability/purity, morphology, structural aspects, and magnetic parameters. Analysis of the powder patterns indicated that NiFe2O4 is phase pure. However, a small fraction of impurity phase, identified as zirconia (ZrO2), has been observed in Zr-doped sample, due to charge and size mismatch between and Zr and Fe. After incorporating Zr4+ into the lattice structure, MS decreased and HC increased. Considerable changes in the microstructural parameters and octahedral site preference of Zr4+ are responsible for the observed change in the magnetic parameters of Zr-substituted sample.
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