Hydrothermal Synthesis and Characterization of MSn2(PO4)3(M=Na,K,NH4)

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (6): 831.

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Hydrothermal Synthesis and Characterization of MSn₂(PO₄)₃(M=Na,K,NH₄)

XU Yue-Hua, FENG Shou-Hua, PANG Wen-Qin

Department of Chemistry, Key Laboratory of Inorganic Hydrothermal Synthesis, Jilin Unitversity, Changchun l30023

Received:1994-08-22 Revised:1995-03-30 Online:1995-06-24 Published:1995-06-24

Abstract

Abstract: Hydrothermal synthesis of MSn₂(PO₄)₃(M=Na, K, NH₄)compounds has been carried out at lower temperature,and their pure phases were easily obtained by hydrothermal crystallization. The compounds crystallize in rho. mbohedral form with a=0.8526(2)nm and c=2.247(4) nm for NaSn₂(PO₄)₃, a=0.8366(1) nm and c=2.356(4) nm for KSn₂(PO₄)₃, a=0.8330(l) nm and c=2.390(5)nm for NH₄Sn₂(PO₄)_3.The results of thermal analysis show that for Na and Kanalogues neither decomposition nor condensation took place up to ll00℃, whereas NH₄Sn₂(PO₄)₃could exist stably below 769℃,above this temperature it could be transformed to HSn₂(PO₄)₃LiSn₂(PO₄)₃and HSn₂(PO₄)₃could not be prepared directly by hydrothermal method. Apossible explanation for this is given.

Key words: Hydrothermal synthesis, Phosphates, Structure and property

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XU Yue-Hua, FENG Shou-Hua, PANG Wen-Qin . Hydrothermal Synthesis and Characterization of MSn₂(PO₄)₃(M=Na,K,NH₄)[J]. Chem. J. Chinese Universities, 1995, 16(6): 831.

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Hydrothermal Synthesis and Characterization of MSn₂(PO₄)₃(M=Na,K,NH₄)

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