extracting Al2O (SO4) 2 oxide with zinc chloride hydrate in deionised water. The sample was
then subjected to heat treatment at 650° C and 700° C for 1 h, which led to the formation of
the spinel oxide (ZnAl2O4) and wurtzite (ZnO) phases. Al2 (SO4) 3· 18H2O salt was
transformed into aluminum oxide sulfate Al2O (SO4) 2, which is an intermediary
decomposition product, by calcination at 795° C for 3 h. The structures of the synthesised …