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Small single crystals of ordered perovskite Sr 2 (NiW)O 6 were synthesized by the flux method using SrCl 2 6H 2 O. The crystal becomes antiferromagnetic below 59°K and undergoes a tetragonal-cubic transition at 523°K. Optical and paramagnetic spectra of divalent nickel in Sr 2 (NiW)O 6 were investigated. The optical absorption lines are interpreted as transitions between the singlet ground state and possible Stark levels, following the scheme given by Low for MgO:Ni. Parameters of the energy levels were determined as follows: 10 D q =8575 cm -1 , E p =13430 cm -1 , E D =10860 cm -1 and E G =17120 cm -1 . Paramagnetic resonance occurred at the field strength of 7562 Oe and the frequency of 23.73 GC /sec. Values of g and spin-orbit coupling constant λ were evaluated at 2.242 and -256 cm -1 respectively.
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Nomura et al. (1966) studied this question.
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