Abstract
AbstractTen out of eleven Raman active modes were detected in [Ni(NH3)6] X2 powders, apart from internal modes of the X− ions. The Raman active lattice mode happens to agree fairly well with the predictions of a model based on the electrostatic potential field of point charges. The X = Cl compound showed evidence of losing ammonia during irradiation with the laser beam. Two modes (the NNiN angle deformation and the lattice vibration) are especially sensitive to the NH3− vacancies thus created.
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