NDLI: Thermodynamic studies on the systems M–Te

Content Provider	Springer Nature Link
Author	Jain, Ashish Pankajavalli, R. Babu, R. Anthonysamy, S.
Copyright Year	2013
Abstract	The standard Gibbs energies of formation of Nd$_{2}$TeO$_{6}$ and M$_{6}$TeO$_{12}$ (where M = Nd, Sm) were determined from vapour pressure measurements. The vapour pressure of TeO$_{2}$(g) was measured by employing thermogravimetry-based transpiration technique. The temperature dependence of the vapour pressure of TeO$_{2}$(g) over the mixtures Nd$_{2}$TeO$_{6}$+Nd$_{6}$TeO$_{12}$, generated by the incongruent vapourisation reaction, 3Nd$_{2}$TeO$_{6}$(s) → Nd$_{6}$TeO$_{12}$(s)+2TeO$_{2}$(g)+O$_{2}$(g), was measured in the temperature range 1,408–1,495 K. Similarly, the vapour pressure of TeO$_{2}$(g) over the mixtures M$_{6}$TeO$_{12}$+M$_{2}$O$_{3}$ (where M = Nd, Sm), generated by the incongruent vapourisation reaction, M$_{6}$TeO$_{12}$(s) → 3M$_{2}$O$_{3}$(s)+TeO$_{2}$(g)+½O$_{2}$(g), was measured in the temperature range 1,703–1,773 and 1,633–1,753 K for Nd$_{6}$TeO$_{12}$(s) and Sm$_{6}$TeO$_{12}$(s), respectively. Enthalpy increments of M$_{2}$TeO$_{6}$(s) (where M = Nd, Sm) were determined by inverse drop calorimetric method in the temperature range 573–1,273 K. The thermodynamic functions, viz., heat capacity, entropy and free energy functions, were derived from the measured values of enthalpy increments. A mean value of −2,426.2 ± 0.6 and −2,417.9 ± 1.1 kJ mol$^{−1}$ was obtained for $$ Δ_{\text{f} } H_{298}^{\text{o}} $$ (Nd$_{2}$TeO$_{6}$, s) and $$ Δ_{\text{f}} H_{298}^{\text{o}} $$ (Sm$_{2}$TeO$_{6}$, s), respectively, by combining the value of $$ Δ_{\text{f}} G^{\text{o}} $$ (Nd$_{2}$TeO$_{6}$, s) and $$ Δ_{\text{f}} G^{\text{o}} $$ (Sm$_{2}$TeO$_{6}$, s) derived from vapour pressure data and the free energy functions derived from the drop calorimetric data.
Starting Page	1279
Ending Page	1287
Page Count	9
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	115
Issue Number	2
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-09-29
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gibbs energy of formation Transpiration technique Vapour pressure Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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