Thermodynamic properties of sodium hexatitanate (Na2Ti6O13) at high temperature (298.15–1573 K)
| Autor: | Youling Hou, Lilian Yang, Yuntao Xin, Guishang Pei, Xuewei Lv |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Chemical Engineering Sodium Enthalpy chemistry.chemical_element Thermodynamics General Chemistry Atmospheric temperature range Heat capacity Computer Science Applications Calorimeter Gibbs free energy Entropy (classical thermodynamics) symbols.namesake chemistry symbols Thermal stability |
| Zdroj: | Calphad. 74:102307 |
| ISSN: | 0364-5916 |
| DOI: | 10.1016/j.calphad.2021.102307 |
| Popis: | Sodium hexatitanate (Na2Ti6O13) was reported as an anode side material for Sodium ion batteries owing to low material cost, high energy efficiency, good thermal stability and long cycle life. Therefore, studies pertaining to the thermodynamic properties of Na2Ti6O13 are indispensable for improving its service performance. However, a significant number of literature reviews concerning thermodynamic properties indicated that heat capacity of Na2Ti6O13 at high temperatures should be confirmed. In this study, the 99.5% purity of Na2Ti6O13 sample was successfully prepared via solid-state reaction using TiO2 and Na2CO3 as initial materials. Heat capacity of the as-synthesized samples in the temperature range of 573–1523 K was measured using a multi-high temperature calorimeter 96 line. Heat capacity, Cp, from 298.15 to 1573 K was modeled as a polynomial formula with a prediction error of 3%: Cp = 474.08143 + 0.06286T-8.04068 × 106 T−2 (J⋅mol−1⋅K−1). In combination with the low-temperature data, heat capacity of Na2Ti6O13 from 0 to 1573 K was given in present study. Values of changes in enthalpy, Gibbs free energy and entropy in the temperature range of 298.15–1573 K were calculated based on the temperature dependence of heat capacity. |
| Databáze: | OpenAIRE |
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