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磷酸锡盐的水热合成及其表征 被引量:2

Hydrothermal Synthesis and Characterization of MSn_2(PO_4)_3(M=Na,K,NH_4)
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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。 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.
出处 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 1995年第6期831-835,共5页 Chemical Journal of Chinese Universities
基金 国家自然科学基金
关键词 水热合成 磷酸盐 结构与性质 Hydrothermal synthesis Phosphates Structure and property
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