碱金属
热分解
分解
热解
化学
无机化学
金属
材料科学
矿物学
冶金
有机化学
作者
A. Cygański,J. Kobyłecka
标识
DOI:10.1016/0040-6031(81)80056-1
摘要
The thermal decomposition of thiosulphatobismuthates(III) of alkali metals was investigated. The general formulae of the thiosulphatobismuthates are M3[Bi(S2O3)3]·H2O where M = Na, K, Rb or Cs, and M2Na[Bi(S2O3)3]·H2O where M = K or Cs.
Typical thermal curves for thiosulphatobismuthates(III) and the results obtained in thermal, X-ray, chemical and spectrophotometrical analyses of the decomposition products are shown. The results were used to determine three stages of the thermal decomposition. At the first stage, at about 200°C, hydrated compounds are dehydrated. At the second stage, above 200°C, there is a rapid decrease in mass which is caused by evolving sulphur dioxide; bismuth sulphide and an intermediate decomposition product are formed. At about 320°C the thermal decomposition products are bismuth sulphide and alkali metal sulphate.
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