Abstract
The decomposition pressure of zinc sulphate in the absence or presence of ferric oxide or silica has been measured by e.m.f. method, using calcia stabilized zirconia solid electrolyte, and thermogravimetry in the temperature range 806 to 1088K.The results obtained are as follows;1) In the absence of ferric oxide or silica, zinc sulphate decompose to form zinc oxide through basic zinc sulphate, with the increase of temperature. These decomposition pressure measured well agree with those of other investigators.2) In the presence of ferric oxide, zinc sulphate directly decompose to form zinc ferrite, ZnFe204, without the formation of basic sulphate. The decomposition pressure and standard free energy change were obtained as follows;log (pSO3 /atm) =(12717 ± 106)/T+ 11.070 ± 0.18 (882 to 1015K)log (pSO3 /atm) =-(9499 ± 79)/T + 7.886 ± 0.13 (1015 to 1076K)Δ°/cal =58180 + 480 (50.64 ± 0.83) T (882 to 1015K)ΔG°/cal =43460 + 360 (36.08 ± 0.59) T (1015 to 1076K)3) In the presence of silica, zinc sulphate directly decompose to form zinc silicate, Zn2SiO4, without the formation of basic zinc sulphate. The decomposition pressure and standard free energy change were obtained as follows;log (pSO3 /atm) =-(10832 ± 105)/T+ 9.088 ± 0.15 (903 to 1015K)log (pSO3 /atm) =-(8968 ± 92)/T+7.266 ± 0.13 (1015 to 1088K)ΔG°/cal =49560 ± 480 -(41.58 ± 0.68) T (903 to 1015K)ΔG°/cal =41030 ± 420-(33.24 ± 0.59) T (1015 to 1088K)
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