Abstract
The process of thermolysis of double strontium-tin(IV) hydroxide obtained by precipitation from hydrochloric acid solutions by adding ammonia to pH=10 and the phase composition of its degradation products were studied by differential thermal analysis, X-ray phase analysis and scanning electron microscopy. It was shown that the main stages of dehydration are completed at about 350°C and as a result of thermolysis an X-ray amorphous product is formed, which at temperatures above 700°C transitions to the strontium stannate crystalline phase.
Highlights
Materials based on tin dioxide SnO2 doped with various transition and alkaline earth metals have attracted increased interest of researchers associated with many promising areas of their application [1,2,3]
Further heating of the sample at 500°С leads to the transition of amorphous phase into crystalline with formation of a two-phase SnO2/SrSnO3 composite consisting of nanocrystalline particles of strontium stannate SrSnO3 and tin dioxide SnO2 (Fig. 1, curve 3) that indicates the complicated mechanism of amorphous product crystallization
Exothermic effect observed on the differential thermal (DTA) curve after sample calcination at 680-700°C and not accompanied by weight loss (Fig. 2), according to X-ray diffraction technique (XRD) data (Fig. 1., curve 4), is associated with the decomposition of SrSnO3 and the formation of SnO2 phase and weakly crystallized Sr2SnO4 phase with the spinel structure which is consistent with the literature data
Summary
Materials based on tin dioxide SnO2 doped with various transition and alkaline earth metals have attracted increased interest of researchers associated with many promising areas of their application [1,2,3]. Stannates of alkaline earth metals are used as components of ceramic dielectric materials, heat-resistant capacitors and semiconductor sensors of various gases [4,5,6,7,8]. Materials based on SrSnO3 exhibit luminescent and photocatalytic properties, and ceramic pigments are synthesized on its basis [10,11,12,13]. One of the most promising methods for obtaining strontium stannate is the process of thermal decomposition of the precursor, mixed strontium and tin (IV) hydroxide, with the composition SrSn(OH). In this work data on the preparation and study of the compositions and properties of the products of its thermal decomposition are considered
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