Enthalpy increments and thermodynamic functions of rare earth samarium titanates RESmTi2O7(s) (RE = Gd,Dy)
| Autor: | B. Prabhakara Reddy, R. Kandan, G. Panneerselvam |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Rare earth Enthalpy chemistry.chemical_element 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Heat capacity 010406 physical chemistry 0104 chemical sciences Gibbs free energy Samarium Crystallography symbols.namesake chemistry symbols Physical and Theoretical Chemistry 0210 nano-technology Polynomial Expression |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 132:1639-1644 |
| ISSN: | 1588-2926 1388-6150 |
| DOI: | 10.1007/s10973-018-7125-y |
| Popis: | Enthalpy measurements have been taken on GdSmTi2O7 and DySmTi2O7 by using a high-temperature differential calorimeter at temperature between 800 and 1655 K. Thermodynamic function, such as heat capacity, entropy and Gibbs energy functions of GdSmTi2O7 and DySmTi2O7, was derived using the data obtained in this study. The results are presented and compared with the data available in the literature. The polynomial expression of enthalpy increments obtained for GdSmTi2O7(s) and DySmTi2O7(s) in the temperature range 298–1700 K is given as: $$\begin{aligned} H_{\text{T}}^{0} - H_{298}^{0} / {\text{J}}\,{\text{mol}}^{ - 1} & = 252.961\,T \, + 1.596 \times 10^{ - 2} \,T^{2} + 3.705 \times 10^{6} \,T^{ - 1} - 89{,}265\quad ({\text{GdSmTi}}_{2} {\text{O}}_{7} ) \\ H_{\text{T}}^{0} - H_{298}^{0} / {\text{J}}\,{\text{mol}}^{ - 1} & = 256.504\,T \, + 1.576 \times 10^{ - 2} \,T^{2} + 3.531 \times 10^{6} \,T^{ - 1} - 89{,}721\quad \left( {{\text{DySmTi}}_{2} {\text{O}}_{7} } \right). \\ \end{aligned}$$ |
| Databáze: | OpenAIRE |
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