HEAT CAPACITY AND THERMODYNAMIC PROPERTIES OF COMPLEX OXIDES WITH β-PYROCLORE STRUCTURE RbTe1.5W0.5O6 AND Rb0.95Nb1.375Mo0.625O5.79

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Abstract

The heat capacity of complex oxides with β-pyrochlore structure RbTe1.5W0.5O6 and Rb0.95Nb1.375Mo0.625O5.79 was investigated by adiabatic vacuum and differential scanning calorimetry in the temperature range of T=(6-640) K. The standard thermodynamic functions: heat capacity Cop, enthalpy [H○(T)-H○(0)], absolute entropy [S○(T)] and the Gibbs energy [G○(T)-H○(0)] for the range from T→0 to 640 K were calculated based on the obtained experimental data. The low-temperature (T<50 K) heat capacity dependence was analyzed on the basis of multifractal model and chain-layered structure topology of the studied compounds was established.

About the authors

A. V. Markin

Lobachevsky State University of Nizhny Novgorod

Email: markin@chem.unn.ru
Nizhny Novgorod, Russia

N. N. Smirnova

Lobachevsky State University of Nizhny Novgorod

Nizhny Novgorod, Russia

P. E. Goryunova

Lobachevsky State University of Nizhny Novgorod

Nizhny Novgorod, Russia

D. G. Fukina

Lobachevsky State University of Nizhny Novgorod

Nizhny Novgorod, Russia

E. V. Suleimanov

Lobachevsky State University of Nizhny Novgorod

Nizhny Novgorod, Russia

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