Common names are phosphorus pentoxide and phosphoric anhydride. Chemical formula P2O5 or P4O10 . It is obtained by burning phosphorus in air or oxygen. There are three forms depending on the crystallization method. The first crystallization obtained by burning phosphorus is the hexagonal crystal system, which can be purified by sublimation at 1 atm and 360 °C. At higher temperatures, the orthorhombic or tetragonal crystal systems are formed. It is a white powder. It is highly hygroscopic. It dissolves in water to form metaphosphoric acid HPO3 , and in hot water to form orthophosphoric acid H3PO4 . In the hexagonal crystal system and gas, the phosphorus atoms are at the vertices of a regular tetrahedron, six oxygen atoms are located on each edge, and the remaining four oxygen atoms are located above the phosphorus on the axis of the regular tetrahedron. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
慣用名は五酸化リン,無水リン酸。化学式P2O5またはP4O10。リンを空気または酸素中で燃焼させると得られる。結晶化の方法によって3形態がある。リンの燃焼によって最初に得られるのは六方晶系であって,1気圧,360℃で昇華精製できる。高温では斜方晶系あるいは正方晶系を生ずる。白色の粉末。強吸湿性である。水に溶けてメタリン酸HPO3となり,さらに温水ではオルトリン酸H3PO4となる。六方晶系のものおよび気体では,リン原子は一つの正四面体の各頂点にあり六つの酸素が各稜上に位置し,残りの四つの酸素はその正四面体の軸上のリンの上にある。
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