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| Section4 = | Section7 = }} Nickel sulfide is the inorganic compound with the formula NiS. It is a black solid that is produced by treating nickel(II) salts with hydrogen sulfide. Many nickel sulfides are known, including the mineral millerite, which also has the formula NiS. Aside from being useful ores, nickel sulfides are the products of desulfurization reactions, and are sometimes used as catalysts. Nonstoichiometric forms of nickel sulfide are known, e.g., Ni9S8 and Ni3S2. ==Structure== Like many related materials, nickel sulfide adopts the nickel arsenide motif. In this structure, nickel is octahedral and the sulfide centers are in trigonal prismatic sites.〔Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.〕 Nickel sulfide has two polymorphs. The alpha form has a hexagonal unit cell, while the beta form has a rhombohedral cell. Small amounts of this compound occur as imperfection when glass is manufactured. It is believed that cracks occur in toughened window glass panels due to the volume change associated with the alpha to beta phase transition of these nickel sulfide defects.〔(【引用サイトリンク】 url = http://www.glassonweb.com/articles/article/96/ )〕 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 sulfide」の詳細全文を読む スポンサード リンク
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