The chemical formula is Na 2 O. In addition to this composition, there is also sodium peroxide, Na 2 O 2 , which contains the peroxide ion O 2 2- . Na 2 O is a colorless powder. Its structure is an inverse fluorite type, with O at the Ca position and Na at the F position of a CaF 2 cubic lattice. The lattice constant a = 5.55 Å. Specific gravity is 2.27. When heated above 400°C, it decomposes into Na 2 O 2 and Na. It is hygroscopic and reacts violently with water to produce sodium hydroxide. It also absorbs carbon dioxide to become sodium carbonate. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
化学式Na2O。ナトリウムの酸化物には,この組成のほかに過酸化物イオンO22-を含む過酸化ナトリウムNa2O2がある。Na2Oは無色の粉末。構造は逆蛍石型で,CaF2立方格子のCaの位置にOが,Fの位置にNaが配置した形をとる。格子定数a=5.55Å。比重2.27。400℃以上に熱するとNa2O2とNaに分解する。吸湿性で,水と激しく反応して水酸化ナトリウムを生ずる。また二酸化炭素を吸収して炭酸ナトリウムになる。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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