Abstract
Alkali earth metal hydroxostannates(IV) MSn(OH)6, M = Mg, Ca, Sr, were synthesized by precipitation from water solutions of SnCl4, MCl2 and ammonium hydroxide. From analysis of parameters of thermal decomposition of compounds MSn(OH)6 three stages of the decomposition were revealed: initial low-temperature stage at temperatures below 200 °C which was the most pronounced for SrSn(OH)6, intermediate temperature stage proceeding in the temperature range of 200–400 °C which was most expressed for CaSn(OH)6 and MgSn(OH)6 and the final stage at temperatures above 400 °C when remaining small quantity of water gradually evolved from the samples. Two first stages were characterized by separate endothermic peaks, whereas no heat effects were observed on the final stage. During the decomposition initial crystal structures transformed into metastable amorphous ones. At temperatures 650–700 °C the amorphous phases transformed to nanocrystalline phases MSnO3 containing small impurity of nanocrystalline SnO2.
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