SYNTHESIS AND THERMODYNAMIC PROPERTIES OF ERBIUM TITANATE

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Abstract

Erbium titanate was synthesized by co-precipitation of erbium and titanium hydroxides followed by high-temperature annealing. The temperature intervals of the sequence of formation of pyrochlore-type crystal structure were determined. Measurements of the isobaric heat capacity of erbium titanate in the range of 2-1870 K were carried out by relaxation, adiabatic and differential scanning calorimetry methods. On the basis of smoothed values of heat capacity, entropy and enthalpy increment in the region 0-1900 K were calculated, the contribution of Schottky anomaly at temperatures up to 300 K was evaluated, and the Gibbs energy of erbium titanate formation at 298.15 K was calculated.

About the authors

A. V. Guskov

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

Moscow, Russia

P. G. Gagarin

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

Moscow, Russia

V. N. Guskov

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

Email: guskov@igic.ras.ru
Moscow, Russia

K. S. Gavrichev

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

Moscow, Russia

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