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|Section2= |Section3= |Section4= |Section7= |Section8= }} Nickel(II) hydroxide Ni(OH)2 is an insoluble compound with strong redox properties and widespread industrial and laboratory applications. It most commonly is used in rechargeable battery electrodes, by oxidation to nickel(III) oxide-hydroxide.〔 ==Properties== Nickel(II) hydroxide has two well-characterized polymorphs, its α and β forms. The α structure consists of Ni(OH)2 layers with intercalated anions or water molecules occupying the space between layers.〔Oliva, P.; Leonardi, J.; Laurent, J.F. Journal of Power Sources. 1982, 8, 229-255.〕〔Jeevanandam, P.; Koltypin, Y.; Gedanken, A. Am. Chem. Soc. Nano Letters. 2001, 1, 263-266.〕 The β form is a hexagonal closest-packed structure of Ni2+ and OH− ions, without other intercalated ions.〔〔 In the presence of water, the α polymorph typically decays to the β form due to dissolution and recrystalization.〔〔Shukla, A.K.; Kumar, V.G.; Munichandriah, N. J. Electrochem. Soc.1994, 141, 2956-2959.〕 In addition to the α and β polymorphs, several γ nickel hydroxides have been described, distinguished by crystal structures with much larger inter-sheet distances.〔 The mineral form of Ni(OH)2, theophrastite, was first identified in the Vermion region of northern Greece, in 1980. It is found naturally as a translucent emerald-green crystal formed in thin sheets near the boundaries of idocrase or chlorite crystals.〔Marcopoulos, T.; Economou, M. ''American Mineralogist'', 1980, 66, 1020-1021.〕 A nickel-magnesium variant of the mineral, (Ni,Mg)(OH)2 had been previously discovered at Hagdale on the island of Unst in Scotland.〔Livingston, A. and Bish, D. L. (March 1982) "On the new mineral theophrastite, a nickel hydroxide, from Unst, Shetland, Scotland". ''Mineralogical Magazine''. 6 No. 338.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nickel(II) hydroxide」の詳細全文を読む スポンサード リンク
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