Thermodynamic properties of rubidium niobium tungsten oxide |
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Authors: | Aleksandr Knyazev Miros?aw M?czka Nataliya Kuznetsova Jerzy Hanuza and Aleksey Markin |
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Institution: | (1) Nizhny Novgorod State University, Gagarin Prospekt 23/2, 603950 Nizhny Novgorod, Russia;(2) Instutite of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroclaw, Poland |
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Abstract: | In the present work temperature dependence of heat capacity of rubidium niobium tungsten oxide has been measured first in
the range from 7 to 395 K and then between 390 and 650 K, respectively, by precision adiabatic vacuum and dynamic calorimetry.
The experimental data were used to calculate standard thermodynamic functions, namely the heat capacity
^ (T), C_{\text{p}}^{\text{o}} (T), enthalpy
H\texto (T) - H\texto (0) H^{\text{o}} ({\rm T}) - H^{\text{o}} (0) , entropy
S\texto (T) - S\texto ( 0 ) S^{\text{o}} (T) - S^{\text{o}} \left( 0 \right) , and Gibbs function
G\texto (T) - H\texto (0) G^{{^{\text{o}} }} ({\rm T}) - H^{{^{\text{o}} }} (0) , for the range from T→0 to 650 K. The high-temperature X-ray diffraction and the differential scanning calorimetry were used for the determination
of temperature and decomposition products of RbNbWO6. |
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Keywords: | |
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