Synthesis and structure of a new variety of indium phosphate β-InPO₄

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• 作者：Peltier ; Valé ; rie ; Deniard ; Philippe ; Brec ; Raymond ; Marchand ; Roger
• 关键词：new indium phosphate ; synthesis ; structure ; nouveau phosphate d'indium ; synthè ; se ; structure
• 刊名：Comptes Rendus de lAcademie des Sciences Series IIB Mechanics Physics Chemistry Astronomy
• 出版年：1998
• 期刊代码：10_12518069
• 类别：ph
• 出版时间：January, 1998
• 卷：1
• 期：1
• 页码：57-62
• 文件大小：391 K

摘要

A new high-temperature allotropic form of indium phosphate, β-InPO₄, has been obtained through quenching of an amorphous InPO₄ phase heated for one hour at 1 300 °C. The two precursor amorphous phases, prepared according to two different soft chemistry procedures, lead to the same β derivative. The β-InPO₄ structure is the same as the high-temperature varieties presented by MgSO₄ and CoSO₄, with an orthorhombic cell and the parameters a = 8.8800(1) Å, b = 6.8989(1) Å, c = 4.8082(1) Å, V = 294.56(1) ų and Z = 4. The space group is Pnma. The structure was refined using the Rietveld method (R_p = 0.041, R_wp = 0.056 and χ² = 2.63). It is built from [InO₆] octahedra sharing edges to constitute [InO₄] chains running in one direction and linked by [PO₄] tetrahedra. The α and β structures are compared and discussed.