The chemical formula is GeO 2 . It is a colorless solid, and exists in water-soluble hexagonal crystals and insoluble tetragonal crystals. The transition temperature is 1033°C, with the water-soluble form being more stable at lower temperatures. The density of tetragonal crystals is 6.24 g/cm3 and the melting point is 1086°C. On the other hand, the density of hexagonal crystals is relatively small at 4.23 g/cm3 and the melting point is 1116°C. The density varies slightly depending on the method of heat treatment. When melted, it is cooled rapidly to obtain a water-soluble amorphous solid. The water-insoluble form is also insoluble in acid, but is gradually corroded by concentrated alkali. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
化学式GeO2。無色の固体で,水に可溶性の六方晶系に属する結晶と,不溶性の正方晶系に属する結晶とがある。転移温度は1033℃で,水溶性のほうが低温で安定である。正方晶系の結晶の密度は6.24g/cm3で融点1086℃。一方,六方晶系の結晶の密度は4.23g/cm3と比較的小さく,融点は1116℃である。密度は熱処理のしかたによりやや変わる。融解したものを急冷すると水溶性の非晶質の固体が得られる。水に不溶性のものは酸にも不溶であるが,濃アルカリには徐々に侵される。
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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