十酸化四リン

十酸化四リン 化学特性,用途語,生産方法

• 解説

  リンの酸化物で無色の固体．リン原子が四面体型に配置された分子で分子式P₄O₁₀．昔はその組成から五酸化二リンP₂O₅とよばれたが，現在は使わない．無水リン酸という呼称も望ましくない．

• 特徴

  四つのPO4四面体がその二つの頂点を共有してアダマンタンに似た構造をつくっている．P－O（末端）143 pm，P-O（架橋）159 pm

  

• 一般的な説明

  Phosphorus pentoxide forms three solid modifications, of which the metastable M form is the ordinary commercial P2O5. This modification crystallizes as rhombohedra with a molecular lattice (P4O10) and sublimes readily at 250°C and 10 mm. Above 260°C and even more quickly above 500°C, form M changes into form R. The latter crystallizes in a three-dimensional atomic lattice of PO4 tetrahedra and is less volatile. A form S crystallizes in a layer lattice, and a few vitreous forms are also known. Modification M is brittle; R and S form hard crystals, which deliquesce after a few hours in the air and undergo considerable swelling in water. The density of R is 2.72, and that of M is 2.30 (calculated from x-ray data).

• 参考文献

  M. Jansen, B. Lüer, Z. Kristallogr., 177, 149 (1986), DOI: 10.1524/zkri.1986.177.1-2.149.

十酸化四リン 生産企業

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