Abstract
The standard Gibbs energy of formation of Pr2TeO6 \( (\Updelta_{\text{f}} G^{^\circ } \left( {{ \Pr }_{ 2} {\text{TeO}}_{ 6} ,\;{\text{s}}} \right)) \) was derived from its vapour pressure in the temperature range of 1,400–1,480 K. The vapour pressure of TeO2 (g) was measured by employing a thermogravimetry-based transpiration method. The temperature dependence of the vapour pressure of TeO2 over the mixture Pr2TeO6 (s) + Pr2O3 (s) generated by the incongruent vapourization reaction, Pr2TeO6 (s) = Pr2O3 (s) + TeO2 (g) + ½ O2 (g) could be represented as: \( { \log }\left\{ {{{p\left( {{\text{TeO}}_{ 2} ,\;{\text{g}}} \right)} \mathord{\left/ {\vphantom {{p\left( {{\text{TeO}}_{ 2} ,\;{\text{g}}} \right)} {{\text{Pa}} \pm 0.0 4}}} \right. \kern-\nulldelimiterspace} {{\text{Pa}} \pm 0.0 4}}} \right\} = 19. 12- 27132\; \left({\rm{{{\text{K}}}}/T} \right) \). The \( \Updelta_{\text{f}} G^{^\circ } \;\left( {{ \Pr }_{ 2} {\text{TeO}}_{ 6} } \right) \) could be represented by the relation \( \left\{ {{{\Updelta_{\text{f}} G^{^\circ } \left( {{ \Pr }_{ 2} {\text{TeO}}_{ 6} ,\;{\text{s}}} \right)} \mathord{\left/ {\vphantom {{\Updelta_{\text{f}} G^{^\circ } \left( {{ \Pr }_{ 2} {\text{TeO}}_{ 6} ,\;{\text{s}}} \right)} {\left( {{\text{kJ}}\,{\text{mol}}^{ - 1} } \right)}}} \right. \kern-\nulldelimiterspace} {\left( {{\text{kJ}}\,{\text{mol}}^{ - 1} } \right)}} \pm 5.0} \right\} = - 2 4 1 5. 1+ 0. 5 7 9 3\;\left(T/{\text{K}}\right) .\) Enthalpy increments of Pr2TeO6 were measured by drop calorimetry in the temperature range of 573–1,273 K and heat capacity, entropy and Gibbs energy functions were derived. The \( \Updelta_{\text{f}} H_{{298\;{\text{K}}}}^{^\circ } \;\left( {{ \Pr }_{ 2} {\text{TeO}}_{ 6} } \right) \) was found to be \( {{ - 2, 40 7. 8 \pm 2.0} \mathord{\left/ {\vphantom {{ - 2, 40 7. 8 \pm 2.0} {\left( {{\text{kJ}}\,{\text{mol}}^{ - 1} } \right)}}} \right. \kern-\nulldelimiterspace} {\left( {{\text{kJ}}\,{\text{mol}}^{ - 1} } \right)}} \).
Similar content being viewed by others
References
Haines HR, Potter PE, Rand MH. Some phase diagram studies of systems with fission product elements for fast reactor fuels. In: Proceedings of the International Symposium on thermodynamics of nuclear materials, vol II, Julich, 1979. Vienna: IAEA; 1980.
Kleykamp H. Chemical states of the fission products in oxide fuels. J Nucl Mater. 1985;131:221–46.
Cordfunke EHP, Konings RJM. Chemical interaction in water cooled nuclear fuel: a thermochemical approach. J Nucl Mater. 1988;152:301–9.
Ditmars DA, Ishihara S, Chang SS, Bernstein G, West ED. Enthalpy and heat-capacity standard reference material – synthetic sapphire (α-Al2O3) from 10 to 2250 K. J Res Natl Bur Stand 1982;87(2):159–63.
Babu R, Kandan R, Jena H, Govindan Kutty KV, Nagarajan K. Calorimetric investigations on cubic BaTiO3 and Ba0.9Nd0.1TiO3 systems. J Alloys Compd. 2010;506:565–8.
Preston-Thomas H. The international temperature scale of 1990 (ITS-90). Metrologia. 1990;27(1):3–10.
Balakrishnan S, Pankajavalli R, Anthonysamy S, Ananthasivan K. Thermodynamic stability of Sm2TeO6. Thermochim Acta. 2008;467:80–5.
Pankajavalli R, Mallika C, Sreedharan OM, Raghunathan VS, Antony Premkumar P, Nagaraja KS. Determination of vapour pressure and standard enthalpies of sublimation and vapourisation of N,N′-ethylenebis (2,4-pentanedion-iminoato) nickel(II) by a TG-based transpiration method. Chem Eng Sci. 2002;57:3603–10.
Pankajavalli R, Jain A, Anthonysamy S, Ananthasivan K, Rao PRV. Vapour pressure and standard enthalpy of sublimation of alkali–metal fluoroborates. Thermochim Acta. 2007;452:1–6.
Muenow DW, Hastie JW, Hauge R, Bautista R, Margrave JL. Vaporization, thermodynamics and structures of species in the tellurium + oxygen system. Trans Faraday Soc. 1969;65:3210–20.
Knacke O, Kubaschewski O, Hesselmann K. Thermochemical properties of inorganic substances. 2nd ed. Germany: Springer-Verlag; 1991.
Aggarwal R, Singh Z. Enthalpy increments of Ba2Te3O8(s) and Ba3Te2O9(s) compounds. J Alloys Compd. 2006;414:230–4.
Pankajavalli R, Jain A, Babu R, Ananthasivan K, Anthonysamy S, Ganesan V. Thermodynamic characterization of lanthanum tellurate. J Nucl Mater. 2010;397:116–21.
Hultgren R, Desai PD, Hawkins DT, Gleiser M, Kelley KK. Selected values of the thermodynamic properties of elements. Metals Park, OH: American Society for Metals; 1973.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Pankajavalli, R., Jain, A., Babu, R. et al. Thermodynamic studies on Pr2TeO6 . J Therm Anal Calorim 111, 1609–1614 (2013). https://doi.org/10.1007/s10973-012-2461-9
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10973-012-2461-9