【摘要】 用水热法合成出系列化合物ＭＳｎ２（ＰＯ４）３（Ｍ＝Ｎａ，Ｋ，ＮＨ４）。该化合物具有ＮＡＳＩＣＯＮ型三维骨架结构，测得其晶胞参数为：（ｌ）ＮａＳｎ２（ＰＯ４）３，ａ＝０．８５２６（２）ｎｍ，ｃ＝２．２４７（４）ｎｍ；（２）ＫＳｎ２（ＰＯ４）３，ａ＝０．８３６６（１）ｎｍ，ｃ＝２．３５６（４）ｎｍ；（３）ＮＨ４Ｓｎ２（ＰＯ４）３，ａ＝０．８３３０（ｌ）ｎｍ，ｃ＝２．３９０（５）ｎｍ。热分析结果表明，在较低温度下水热晶化出的钠和钾磷酸锡盐可稳定存在，在１１００℃高温下不分解，而ＮＨ４Ｓｎ２（ＰＯ４）３在７６９℃以上发生分解，测定了产物在室温下的电导率。更多还原

【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 K analogues neither decomposition nor condensation took place up to ll00℃, whereas NH4Sn2(PO4)3 could exist stably below 769℃,above this temperature it could be transformed to HSn2(PO4)3. LiSn2(PO4)3 and HSn2(PO4)3 could not be prepared directly by hydrothermal method. A possible explanation for this is given.更多还原