Abstract
Optical absorption studies of the quadratic-layer antiferromagnets K 2 NiF 4 , Rb 2 NiF 4 and Ba 2 NiF 6 in the regions of electronic transitions have been performed from the magnetic anisotropic point of view. A Ni 2+ energy spectrum reflecting a tetragonal crystalline field was observed in Ba 2 NiF 6 , while cubic spectra were obtained in K 2 NiF 4 and Rb 2 NiF 4 . From the observed tetragonal splitting energy of 3 T 2 g ( 3 F ) band, the single ion anisotropy constant D of Ni 2+ in Ba 2 NiF 6 was determined as fairly large value of -15.4±1.8 cm -1 and -12.8±1.8 cm -1 at 300 K and 90 K, respectively.
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