Abstract
The existence of very short non-bonded H–H distances in β-Ni(OH) 2 at ambient conditions, predisposes this compound towards a structural change at very low pressures. To investigate this, we have now carried out a high-pressure Raman scattering investigation on β-Ni(OH) 2 up to 25 GPa. Our results show a monotonic stiffening of all the lattice modes and a small softening of hydroxyl symmetric stretch mode under pressure. Absence of any signature of a phase transformation up to 25 GPa and a reversible intrinsic broadening of the OH mode suggest that, even at the ambient conditions, β-Ni(OH) 2 may be in the non-ideal CdI 2 structure in which H-lattice is disordered.
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