Thermodynamic properties of rubidium niobium tungsten oxide |
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Authors: | Aleksandr Knyazev Miros?aw M?czka Nataliya Kuznetsova Jerzy Hanuza Aleksey Markin |
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Affiliation: | (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 Htexto (T) - Htexto (0) H^{text{o}} ({rm T}) - H^{text{o}} (0) , entropy Stexto (T) - Stexto ( 0 ) S^{text{o}} (T) - S^{text{o}} left( 0 right) , and Gibbs function Gtexto (T) - Htexto (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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