Abstract
The NiCr2−xFexO4, (x=0.1,0.3,0.5) samples have a cubic structure at room temperature. For the sample with x=0.1, the lattice constant is determined to be a0=8.319Å with a cubic spinel (Fd-3m) structure. The ferrimagnetic Néel temperature (TN) of NiCr2O4 is determined to be 80K by zero field cooled magnetization curves under the external field of 100Oe. With increasing Fe substitution, TN increases, and for x=0.1, TN is determined to be 135K. For the sample with x=0.1, the Mössbauer spectrum at 4.2K was fitted to two magnetic components of the magnetic hyperfine fields Hhf=488 and 472kOe and isomer shifts δ=0.29 and 0.28mm∕s. The electric quadrupole splittings (ΔEQ) were found to be nearly zero below the TN=135K. For the spectrum at 295K, the ΔEQ are observed with large values of 0.54 and 0.37mm∕s, respectively. The values of the isomer shifts show that for all temperature ranges, the states are ferric (Fe3+). The Mössbauer spectra below the TN show the line broadening with the Jahn-Teller distortion and accompanying relaxation effects, respectively.
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