Abstract
The nanocrystalline nickel chromite (NiCr2O4) with particle size of ∼20nm was prepared by auto-combustion method. The nanocrystals were characterized by powder X-ray diffraction, vibrational spectroscopy and magnetic measurements. The expected structural phase transitions (cubic–tetragonal–orthorhombic) were studied by methods of temperature-dependent X-ray powder diffraction and vibrational spectroscopy. The evolution of the Raman spectra and X-ray diffraction patterns collected from 350K down to 4K confirmed the cubic-to-tetragonal distortion at ∼250K, whereas the tetragonal-to-orthorhombic transition was not confirmed in the nanocrystalline sample.
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