Thermodynamic properties of ytterbium titanate

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Abstract

The isobaric heat capacity of a single-phase sample of ytterbium titanate of pyrochlore structural type synthesized and characterized by XRD, SEM, and EDX methods in the temperature range 2–1869 K is measured for the first time. The existence of magnetic transformation at < 20 K and the absence of structural transformations in the entire region of existence of Yb2Ti2O7 are confirmed. Thermodynamic functions, viz. the entropy and the enthalpy increment and the Gibbs free energy of formation of Yb2Ti2O7 from elements and binary oxides at 298.15 K are calculated. The contribution to the heat capacity of the Schottky anomaly is estimated.

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About the authors

A. V. Guskov

N. S. Kurnakov Institute General and Inorganic Chemistry, Russian Academy of Sciences

Email: guskov@igic.ras.ru
Russian Federation, Moscow, 119991

P. G. Gagarin

N. S. Kurnakov Institute General and Inorganic Chemistry, Russian Academy of Sciences

Email: guskov@igic.ras.ru
Russian Federation, Moscow, 119991

V. N. Guskov

N. S. Kurnakov Institute General and Inorganic Chemistry, Russian Academy of Sciences

Author for correspondence.
Email: guskov@igic.ras.ru
Russian Federation, Moscow, 119991

K. S. Gavrichev

N. S. Kurnakov Institute General and Inorganic Chemistry, Russian Academy of Sciences

Email: guskov@igic.ras.ru
Russian Federation, Moscow, 119991

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2. Fig. 1. DSC/TG of ytterbium titanate precursor.

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3. Fig. 2. Surface morphology of ytterbium titanate.

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4. Fig. 3. Diffraction pattern of a sample of ytterbium titanate, structural type Fm3m, a = 10.032(2) Å, CuKα-radiation, λ = 1.5418 Å.

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5. Fig. 4. Experimental heat capacity of Yb2Ti2O7 (pyrochlore), P = 101.3 kPa. The insets show the areas where the results of relaxation and adiabatic (2–45 K), adiabatic and differential scanning (310–350 K) calorimetry measurements are joined.

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6. Fig. 5. Comparison of excess heat capacity: 1 – difference between the heat capacities of Yb2Ti2O7 and Lu2Ti2O7 [31]; 2 – calculation using equation 2 (the heat capacity of gadolinium oxide is corrected to take into account the magnetic contribution and the contribution of the Schottky anomaly); 3 – calculation of the Schottky anomaly from spectral data on Stark levels (0, 388, 595, 1021 cm–1) [32].

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7. Fig. 6. Molar heat capacity of Yb2Ti2O7: 1 – measured by DSC and 2 – calculated by Neumann–Kopp from the heat capacities of simple oxides.

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