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

378
A Discussion of selected references
Figure A-44: Entropy function of Sn 2 S 3 (cr).
–1·mol
–1
S°
m
/J·K
200
150
100
calc. by integrating C p
/T [1980WIE/CSI2]
calc. from[1958ORR/CHR]
S° m
(SnS, α, 298.15 K) = (76.99 ± 0.84) J·K –1·mol –1 [1953KIN/TOD]
values from Table II [1958ORR/CHR]
S° m
(α-SnS), S° m
(β-SnS), S° m
(SnS(l))
–1
Δ α - β
S° = 0.765 J·K
–1·mol
–1
Δ β - l
S° = 27.40 J·K
–1·mol
50
0
0 200 400 600 800 1000 1200
T / K
[1980ZHO/KOS]
The specific heat of crystalline tin dioxide has been measured in an adiabatic
calorimeter with periodic heat input, and the thermodynamic functions (H T − H 0 )/T, S T −
S 0 , and − (G T − H 0 )/T have been calculated from the results. Some discrepancies with
[1929MIL2] are noted, and ascribed to the method of sample preparation.
Heat capacity data for tetragonal tin dioxide have been measured by the
authors. They are presented in Table A-48.
[1981BAC/HSU]
Fig. 2 of this paper shows a plot of the characteristic temperature θ D (SnO 2 ) versus T in
the range 0 ≤ T ≤ 20 K. From this data the Debye temperature was estimated to be
θ D (SnO 2 ) = (500 ± 30) K.
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012