Chemical Thermodynamics of Tin - Volume 12 - OECD Nuclear ...

VII.2 Solid tin oxides and hydroxides
133
Figure VII-13: Heat capacity of SnO 2 (cass).
100
80
[2004GUR/GAV2] model
conventional calculation
[1980ZHO/KOS]
–1·mol
–1
C° p, m
/ J·K
60
40
20
C° p, m
data not used for evaluation
[1929HU T/MAG]
[1990GLA/PAS] corrected for M (SnO 2
)
[1929MIL]
0
0 200 400 600 800 1000 1200 1400 1600
T / K
Based on the review of all data, the following values are selected:
Δ H (SnO 2 , cass, 298.15 K) = − (577.63 ± 0.20) kJ·mol –1 ,
f
ο
m
ο
S
m
(SnO 2 , cass, 298.15 K) = (51.77 ± 0.14) J·K –1·mol –1 ,
ο
C
p,m
(SnO 2 , cass, 298.15 K) = (55.26 ± 0.09) J·K –1·mol –1 .
This selection yields:
ο
ΔfG m
(SnO 2 , cass, 298.15 K) = − (516.64 ± 0.21) J·K –1·mol –1 .
It is possible to combine the high temperature data of Kapustinskii et al.
[1936KAP/ZIL] and the data of Gurevich et al. [2004GUR/GAV2] in the temperature
range from 296.90 to 336.88 K with Eq. (VII.25). According to Kapustinskii et al.
ο
[1936KAP/ZIL] their C ( p,m
T ) function is given by the following Maier and Kelley
equation [1932MAI/KEL]
ο
C ( /J·K –1·mol –1 = a + b T/K+ c (T/K) –2 p,m
T )
.
(VII.26)
ο
Equation (VII.26) was used to calculate Cp,m( T)
in the range from 595 to
1496 K. Coefficients of the equations are listed in Table A-73 and the data are tabulated
in Table A-74.
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012