| Autor: |
Kopan, A. R., Gorbachuk, N. P., Lakiza, S. M., Tischenko, Ya. S., Korablov, D. S. |
| Předmět: |
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| Zdroj: |
Powder Metallurgy & Metal Ceramics; Sep2018, Vol. 57 Issue 5/6, p336-343, 8p |
| Abstrakt: |
The isobar heat capacity of Gd2Hf2O7 is studied for the first time by adiabatic calorimetry in the range 80-298.15 K. It is shown that Cp of gadolinium hafnate changes monotonically and no anomalies are observed. The temperature dependences of the principal thermodynamic functions of Gd2Hf2O7 in the range 10-300 K are established. The heat capacity, entropy, reduced Gibbs energy, and enthalpy are determined for standard conditions: Cp∘ (298.15 K) = 224.2 ± 0.9 J × × mol-1·K-1, S°(298.15 K) = 237.1 ± 2 J · mol-1 · K-1, Φ′ (298.15 K) = 109.4 ± 1.6 J · mol-1 · K-1, and H°(298.15 K) - H°(0 K) = 38084 ± 190 J · mol-1. The temperature dependence of the Gd2Hf2O7 heat capacity is evaluated using the Neumann-Kopp rule of additivity. The difference between the experimental and evaluated heat capacities of Gd2Hf2O7 in the range 80-298.15 K is no more than 3.4%, while the difference in Cp∘ (298.15 K) is 0.4%. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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