Low-temperature properties of BaWO4 based on experimental heat capacity in the range 5.7–304 K
| Autor: | M.A. Bespyatov, V.N. Shlegel, A.E. Musikhin, O.E. Safonova |
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| Rok vydání: | 2019 |
| Předmět: |
Phase transition
Materials science Mechanical Engineering Enthalpy Metals and Alloys Thermodynamics 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Heat capacity 0104 chemical sciences Gibbs free energy symbols.namesake Mechanics of Materials Materials Chemistry symbols 0210 nano-technology Adiabatic process Absolute zero Single crystal Debye model |
| Zdroj: | Journal of Alloys and Compounds. 802:235-243 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2019.06.197 |
| Popis: | The heat capacity of barium tungstate single crystal was measured by the adiabatic method in the range of 5.7–304 K. No anomalies in the heat capacity associated with the phase transition were found. The analysis of the functional behavior of heat capacity near zero revealed a low-frequency peak in the phonon density of states of BaWO4. An approach was proposed to allow quantitative description of the acoustic wing of the phonon density of states. The approximation of experimental data by an analytical expression was done, including the temperature region near 0 K. The Debye temperature at absolute zero has been obtained. The thermodynamic functions were calculated: entropy, enthalpy increment and Gibbs free energy. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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