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Isobaric heat capacity and standard thermodynamic properties of NaLaTiO4 and Na2La2Ti3O10 over the range of (7–670) K
Ist Teil von
Journal of thermal analysis and calorimetry, 2018-02, Vol.131 (2), p.1107-1114
Ort / Verlag
Dordrecht: Springer Netherlands
Erscheinungsjahr
2018
Link zum Volltext
Quelle
SpringerLink (Online service)
Beschreibungen/Notizen
The heat capacities of layered perovskite-like oxides NaLaTiO
4
and Na
2
La
2
Ti
3
O
10
were measured by precision adiabatic vacuum calorimetry over the temperature range of (7–350) K and by differential scanning calorimetry over the temperature range of (350–670) K. The standard thermodynamic functions: molar heat capacity
C
p,m
, enthalpy
H
(
T
) −
H
(9), entropy
S
(
T
) −
S
(9), and Gibbs energy −[
G
(
T
) −
G
(9)] of the compounds were evaluated from the experimental heat capacity temperature dependences over the range of (9–670) K. The extrapolation of heat capacity down to
T
= 0 K is incorrect in this case due to the considerable deviation of experimental points from fitting curves obtained on the basis of Debye’s theory.