The standard molar enthalpies of formation of PbBi12O19(s) and ϕ-Pb5Bi8O17(s) by solution calorimetry. (April 2021)

• Record Type: Journal Article
• Authors: Shyamkumar, S.; Reshmi, P.R.; Muthuambika, T.; Parida, Sanjit Kumar; Ganesan, Rajesh
• Is Part Of: Journal of chemical thermodynamics. Volume 155(2021)
• Publication Date: 2021-04
• Subjects: Heavy liquid metal coolants -- Lead bismuth oxides -- PbBi12O19 -- ϕ-Pb5Bi8O17 -- Solution calorimetry -- Enthalpy of formation; Thermodynamics -- Periodicals; Thermochemistry -- Periodicals; Thermodynamique -- Périodiques; Thermochimie -- Périodiques; Thermochemistry; Thermodynamics; Periodicals; 541.369
• DOI: 10.1016/j.jct.2020.106351
• Languages: English
• ISSNs: 0021-9614

Abstract

Highlights: Δ f H 298 o of PbBi12 O19 (s) and ϕ-Pb5 Bi8 O17 (s) were determined. Dissolution was carried out in an acid solution isoperibol calorimeter. Nitric acid (aq., 4.47 mol kg −1 ) is used as the calorimetric solvent. Abstract: The standard molar enthalpies of formation of PbBi12 O19 (s) and ϕ-Pb5 Bi8 O17 (s) at 298.15 K were determined using an isoperibol calorimeter. The enthalpies of solution of ternary compounds, namely, PbBi12 O19 (s) and ϕ-Pb5 Bi8 O17 (s) as well as stoichiometric oxide mixtures, namely, {PbO(s) + 6 Bi2 O3 (s)} and {5 PbO(s) + 4 Bi2 O3 (s)} in HNO3 (aq., 4.47 mol kg −1 ) at T = 298.15 K were measured. Using these values, Δ f H m o (298.15 K) of PbBi12 O19 (s) and ϕ-Pb5 Bi8 O17 (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.