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|Section2= |Section3= |Section4= |Section7= |Section8= }} Barium hydroxide are chemical compounds with the chemical formula Ba(OH)2(H2O)x. The monohydrate (x =1) is known as baryta, or baryta-water, it is one of the principal compounds of barium. This white granular monohydrate is the usual commercial form. ==Preparation and structure== Barium hydroxide can be prepared by dissolving barium oxide (BaO) in water: :BaO + 9 H2O → Ba(OH)2·8H2O It crystallises as the octahydrate, which converts to the monohydrate upon heating in air. At 100 °C in a vacuum, the monohydrate gives BaO.〔(1960). ''Gmelins Handbuch der anorganischen Chemie (8. Aufl.)'', Weinheim: Verlag Chemie, p. 289.〕 The monohydrate adopts a layered structure (see picture above). The Ba2+ centers adopt a square anti-prismatic geometry. Each Ba2+ center is bound by two water ligands and six hydroxide ligands, which are respectively doubly and triply bridging to neighboring Ba2+ centers. sites.〔Kuske, P.; Engelen, B.; Henning, J.; Lutz, H.D.; Fuess, H.; Gregson, D. "Neutron diffraction study of Sr(OH)2(H2O) and beta-Ba(OH)2 *(H2O)" Zeitschrift fuer Kristallographie (1979-2010) 1988, vol. 183, p319-p325.〕 In the octahydrate, the individual Ba2+ centers are again eight coordinate but do not share ligands.〔Manohar, H.; Ramaseshan, S. "The crystal structure of barium hydroxide octahydrate Ba (OH)2(H2O)8" Zeitschrift fuer Kristallographie, Kristallgeometrie, Kristallphysik, Kristallchemie 1964. vol. 119, p357-p374〕 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「barium hydroxide」の詳細全文を読む スポンサード リンク
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