High-temperature heat capacity and thermodynamic properties of pyrovanadate Pb2V2O7 and orthovanadate Pb3(VO4)2


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The heat capacities of Pb2V2O7 and Pb3(VO4)2 as a function of temperature in the range 350–965 K have been studied by the differential scanning calorimetry method. The CP = f(T) curve for Pb2V2O7 is described by the equation Cp = (230.76 ± 0.51) + (73.60 ± 0.50)×10-3T − (18.38 ± 0.54)×105T-2 in the entire temperature range. For Pb3(VO4)2, there is a well-pronounced extreme point in the CP = f(T) curve at T = 371.5 K, which is caused by the existence of a structural phase transition. The thermodynamic properties of the oxide compounds have been calculated.

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L. Denisova

Institute of Non-Ferrous Metals and Materials Science

Autor responsável pela correspondência
Email: antluba@mail.ru
Rússia, pr. Krasnoyarskii Rabochii 95, Krasnoyarsk, 660025

A. Izotov

Kurnakov Institute of General and Inorganic Chemistry

Email: antluba@mail.ru
Rússia, Leninskii pr. 31, Moscow, 119991

L. Irtyugo

Institute of Non-Ferrous Metals and Materials Science

Email: antluba@mail.ru
Rússia, pr. Krasnoyarskii Rabochii 95, Krasnoyarsk, 660025

Yu. Kargin

Baikov Institute of Metallurgy and Materials Science

Email: antluba@mail.ru
Rússia, Leninskii pr. 49, Moscow, 119991

V. Denisov

Institute of Non-Ferrous Metals and Materials Science

Email: antluba@mail.ru
Rússia, pr. Krasnoyarskii Rabochii 95, Krasnoyarsk, 660025

V. Beletskii

Institute of Non-Ferrous Metals and Materials Science

Email: antluba@mail.ru
Rússia, pr. Krasnoyarskii Rabochii 95, Krasnoyarsk, 660025

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