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Electron spin resonance has been studied in NiTiF 6 ·6H 2 O, NiSnF 6 ·6H 2 O and NiSnCl 6 ·6H 2 O down to liquid helium temperatures, and spin Hamiltonian and exchange coupling parameters have been derived. A structural phase change with thermal hysteresis occurs in NiTiF 6 ·6H 2 O at T c (cooling) ≈ 121 K causing the ESR signal to disappear. Dilution with Zn increases T c .
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How et al. (1974) studied this question.
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