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Spectroscopic and structural studies of nickel ferrite doped with rare earth ions

The Nickel Ferrite of composition Ni (x)Fe(3-x)O4 with x = 0.3, 0.5,0.7, 0.9 doped with neodymium and gadolinium were studied by infrared absorption spectroscopy. The IR spectrum showed two main absorption bands ν1 and ν2 in the range 400cm -1 -600cm -1 arising from the octahedral and tetrahedral complexes. The positions of absorption bands are compositional dependent whose dependence could be attributed to the variation in cation - oxygen bond distances. The force constant of tetrahedral and octahedral sites supports cation distribution. Addition on gadolinium the absorption band ν1 & ν2 were found to be broadened and the peaks are not sharp. The lattice constants were found to decrease by the addition neodymium and gadolinium. The samples confirm cubic spinel structure and also it was observed that nickel ferrite doped with Nd 3+ a n d G d 3+ show a linear increase in lattice constant.