Thermodynamic properties of pentalead tris(vanadate) chloride

• Published in: Thermochimica acta Vol. 515; no. 1; pp. 79 - 83
• Main Authors: Knyazev, A.V., Bulanov, E.N., Smirnova, N.N., Kuznetsova, N.Yu, Letyanina, I.A., Pryamova, E.D.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 10-03-2011
• Subjects: Apatite; Chlorides; Differential scanning calorimetry; Diffraction; enthalpy; Entropy; heat; Heat capacity; Mathematical analysis; Melting; Phase transition; Specific heat; temperature; thermal expansion; Thermodynamic functions; Vanadinite; X-ray diffraction; Vanadinite; Heat capacity; Apatite; Thermodynamic functions; Phase transition
• ISSN: 0040-6031; 1872-762X
• DOI: 10.1016/j.tca.2010.12.026

In the present work the temperature dependences of pentalead tris(vanadate) chloride heat capacity have been measured for the first time in the range from 7 to 350
K. The experimental data were used to calculate standard thermodynamic functions, namely the heat capacity
C
p
°
(
T), enthalpy
H°(
T)
−
H°(0), entropy
S°(
T)
−
S°(0) and Gibbs function
G°(
T)
−
H°(0), for the range from
T
→
0 to 350
K. The differential scanning calorimetry in temperature interval 298–1473
K was applied to measure temperatures of phase transition and melting of compound under study. The high-temperature X-ray diffraction in range 298–1073
K was used for the determining thermal expansion coefficients.