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|Section2= |Section3= |Section4= |Section7=〔http://www.nmsu.edu/safety/programs/chem_safety/NFPA-ratingS-Z.htm〕 |Section8= }} Sodium peroxide is the inorganic compound with the formula Na2O2. This yellowish solid is the product of sodium ignited in excess oxygen. It is a strong base. It exists in several hydrates and peroxyhydrates including Na2O2·2H2O2·4H2O, Na2O2·2H2O, Na2O2·2H2O2, and Na2O2·8H2O.〔Harald Jakob, Stefan Leininger, Thomas Lehmann, Sylvia Jacobi, Sven Gutewort "Peroxo Compounds, Inorganic" Ullmann's Encyclopedia of Industrial Chemistry, 2007, Wiley-VCH, Weinheim. 〕 ==Properties== Sodium peroxide crystallizes with hexagonal symmetry. Upon heating, the hexagonal form undergoes a transition into a phase of unknown symmetry at 512 °C.〔 With further heating above the 675 °C melting point, the compound decomposes to Na2O, releasing O2, before reaching a boiling point.〔Lewis, R. J. ''Sax's Dangerous Properties of Industrial Materials, 10th ed.'', John Wiley & Sons, Inc.: 2000.〕 : 2 Na2O2 → 2 Na2O + O2 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「Sodium peroxide」の詳細全文を読む スポンサード リンク
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