Thermodynamic stability of CaThF6(cr) by transpiration and e.m.f. techniques |
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Authors: | Mukherjee Sumanta Dawar Rimpi Phapale S. Dash S. Mishra R. |
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Affiliation: | 1.Homi Bhabha National Institute (HBNI), Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India ;2.Fuel Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India ;3.Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India ; |
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Abstract: | In the present paper, we report the standard molar Gibbs energy of formation for CaThF6 measured by gas equilibration and e.m.f. methods. The HF(g) vapour pressure over the equilibrium reaction: ({text{CaThF}}_{6} left( {text{cr}} right) + 2 {text{H}}_{ 2} {text{O}}left( {text{g}} right) = {text{CaF}}_{2} left( {text{cr}} right) + {text{ThO}}_{2} left( {text{cr}} right) + 4{text{HF}}left( {text{g}} right)) has been measured using transpiration technique. The above reaction mechanism has been established employing TG and XRD techniques. A fluoride e.m.f. cell: (−)Pt, CaF2(cr) + ThOF2(cr) + CaThF6(cr) |CaF2(cr)| NiO(cr) + NiF2(cr), Pt(+) has been constructed to measure Gibbs energy of formation of CaThF6 (cr) using CaF2 (cr) as a solid electrolyte. The isobaric heat capacity ({text{Cp}}_{text{m}}^{{circ }} left( T right)) of the compound has been measured using differential scanning calorimetric technique. Based on the experimental results, thermodynamic functions for CaThF6 have been generated. |
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