Effect of the Crystal Deformation on the Lattice Vibration of Oxide Spinels

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Infrared transmission of the powdered specimen of oxide spinels was measured from 20 to 200μ and at 100–400°K. The frequency of the longest wave length absorption decreases by the tetragonal deformation in NiCr2O4 (c⁄a>1) and FeV2O4 (c⁄a<1). In NiCr2O4, the shift is proportional to c⁄a−1, whereas the shift in FeV2O4 starts from a temperature higher than Tc. The result on FeV2O4 is consistent with the Mössbauer spectrum of Fe57. This frequency shift is explained by the change of the deformation magnitude of oxygen tetrahedra around the Jahn-Teller ions, which is induced by the short range ordering of the deformation of the tetrahedra. The line of FeV2O4 shows a marked broadening at Tc. This is attributed to the critical relaxation of phonons.

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