Abstract
The standard molar enthalpies of formation of PbBi12O19(s) and ϕ-Pb5Bi8O17(s) at 298.15 K were determined using an isoperibol calorimeter. The enthalpies of solution of ternary compounds, namely, PbBi12O19(s) and ϕ-Pb5Bi8O17(s) as well as stoichiometric oxide mixtures, namely, {PbO(s) + 6 Bi2O3(s)} and {5 PbO(s) + 4 Bi2O3(s)} in HNO3 (aq., 4.47 mol kg−1) at T = 298.15 K were measured. Using these values, ΔfHmo (298.15 K) of PbBi12O19(s) and ϕ-Pb5Bi8O17(s) were determined as (-3549.6 ± 23.8) kJ mol−1 and (-3239.4 ± 7.6) kJ mol−1, respectively. The given uncertainties were calculated as 2σ of the mean with 0.95 level of confidence.
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