Thermodynamic functions of Tm2O3‧2HfO2 solid solution and Shottky anomaly

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Resumo

The molar heat capacity of the solid solution Tm2O3‧2HfO2 has been determined for the first time by relaxation, adiabatic and differential scanning calorimetry, the temperature dependences of entropy and enthalpy increment in the temperature region 0–1800 K have been calculated, and the contribution to the heat capacity of the Schottky anomaly at 0–300 K has been evaluated.

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Sobre autores

А. Guskov

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: guskov@igic.ras.ru
Rússia, 119991, Moscow

P. Gagarin

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: guskov@igic.ras.ru
Rússia, 119991, Moscow

V. Guskov

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Autor responsável pela correspondência
Email: guskov@igic.ras.ru
Rússia, 119991, Moscow

А. Khoroshilov

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: guskov@igic.ras.ru
Rússia, 119991, Moscow

K. Gavrichev

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: guskov@igic.ras.ru
Rússia, 119991, Moscow

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2. Fig. 1. Diffractogram of a Tm2O3-2HfO2 solid solution sample, structural type Fm3m, a = 5.170(7) Å, CuKa radiation, λ = 1.5418 Å.

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3. Fig. 2. Morphology of the surface of a sample of Tm2O3-2HfO2 solid solution (fluorite).

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4. Fig. 3. Experimental heat capacity of a Tm2O3–2HfO2 solid solution based on the results of relaxation (1), adiabatic (2) and differential scanning (3) calorimetry; low temperature regions (0-27 K) and data docking of adiabatic and differential scanning calorimetry (320-360 K) are shown in the insets.

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5. Fig. 4. Molar heat capacity of a solid solution Tm2O3-2HfO2 in the temperature range 0-37 K according to the results of relaxation (1) and adiabatic (2) calorimetry; heat capacity of solid solutions Lu2O3-2HfO2 (3) [13] and Dy2O3-2HfO2 (4) [12].

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6. Fig. 5. The difference in the heat capacities of solid solutions Tm2O3-2HfO2 (this work) and Lu2O3-2HfO2 [13].

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7. Fig. 6. High-temperature heat capacity of Tm2O3-2HfO2 solid solution (1) and model calculation (2) from the heat capacities of simple oxides Tm2O3 [19] and HfO2 [20], smoothed heat capacity (3) (Table 2).

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