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- W2020126564 abstract "Pure brochantite was prepared at 60° from 0.5M copper(II) sulphate and sodium hydroxide solutions at pH 8.0. The decomposition products arising when it was heated at different temperatures were identified using X-ray diffraction analysis and infrared spectroscopy. Dolerophanite, CuO.CuSO4, which is invariably reported to be formed during the thermal decomposition of brochantite (of both synthetic and mineral origins), was not formed at any stage of the decomposition in the present case. The sequence of decomposition is $$begin{gathered} CuSO_4 .3Cu(OH)_2 .xH_2 Oxrightarrow{{80 - 170^ circ }}CuSO_4 .3Cu(OH)_2 + xH_2 O hfill ,,,,,,,,,,,,,,,CuSO_4 .3Cu(OH)_2 xrightarrow{{250 - 400^ circ }}CuSO_4 .2Cu(OH)_2 + CuO + H_2 O hfill ,,,,,,,,,,,,,,CuSO_4 .2Cu(OH)_2 xrightarrow{{610 - 700^ circ }}3CuO + 2H_2 O + SO_2 + {raise0.5exhbox{$scriptstyle 1$}kern-0.1em/kern-0.15emlower0.25exhbox{$scriptstyle 2$}}O_2 , hfill end{gathered} $$ The higher pH conditions adopted here for the precipitation are probably responsible for the above mechanism of decomposition." @default.
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- W2020126564 title "Thermal analysis, X-ray diffraction and infrared spectroscopic study of synthetic brochantite" @default.
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