Crystallography and mineralogy of nickel hydroxide

In a comprehensive review on bivalent metal hydroxides it was pointed out that the unit cell dimensions of synthetic P-Ni(OH)2 were determined by Lotmar and Feitknecht for the first time [36LOT/FEI], [770SW/ASP]. Like most M(OH)2 hydroxides, the crystal structure is of the CdL- or brucite- type, trigonal, space group P3ml, with unit cell dimensions a = 3.126 A, c = 4.605 A, Z= 1 (according to JCPDS-ICDD card No, 14-117). 

When the excess surface heat capacity estimated by Sorai et al. between 80 and 130 K was assumed to remain constant up to 300 K values of C° ,(Ni(OH)2, cr, 

The latter phase has been called a to emphasise that the composition and the intersheet distance are close to those of the turbostratic a-Ni(OH)2, whereas the texture and structure are different. 

These increased error limits probably account also for the uncertainty introduced by Enoki and Tsujikawa s slightly differing results for bulky Ni(OH)2 between 

For a methodological review of the experimental determination of solubilities of sparingly soluble ionic solids in aqueous media see [2003GAM/KON]. 

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