TY - JOUR
T1 - The magnetic transition, heat capacity, and thermodynamic properties of uranium dioxide from 5 to 350 K
AU - Huntzicker, James J.
AU - Westrum, Edgar F.
N1 - Funding Information:
t Supported in part by the Division of Research of the United States Atomic Energy Commission. Present Address: I Physikalisches Institut der Freien Universit[it Berlin, Berlin, Germany.
PY - 1971/1
Y1 - 1971/1
N2 - The heat capacity of high purity uranium dioxide has been re-examined over the low-temperature range especially in the vicinity of the λ-type anomaly reported to occur at 28·7 K as a consequence of magnetic ordering. The present study indicates a very sharp transition at 30·44 K with a maximum Cp of 391 cal mol-1 K-1. The heat capacity at constant pressure Cp, the entropy S°, the enthalpy (H° - H°0), and Gibbs energy function (G° - H°)/T are tabulated and at 298.15 K have the following values: 15.20 cal mol-1 K-1, 18.41 cal mol-1 K-1, 2696 cal mol-1 K-1, and -9.37 cal mol-1 K-1. The heat capacity results are compared with those derived from the neutron scattering work and also with the theory of Allen.
AB - The heat capacity of high purity uranium dioxide has been re-examined over the low-temperature range especially in the vicinity of the λ-type anomaly reported to occur at 28·7 K as a consequence of magnetic ordering. The present study indicates a very sharp transition at 30·44 K with a maximum Cp of 391 cal mol-1 K-1. The heat capacity at constant pressure Cp, the entropy S°, the enthalpy (H° - H°0), and Gibbs energy function (G° - H°)/T are tabulated and at 298.15 K have the following values: 15.20 cal mol-1 K-1, 18.41 cal mol-1 K-1, 2696 cal mol-1 K-1, and -9.37 cal mol-1 K-1. The heat capacity results are compared with those derived from the neutron scattering work and also with the theory of Allen.
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U2 - 10.1016/S0021-9614(71)80067-8
DO - 10.1016/S0021-9614(71)80067-8
M3 - Article
AN - SCOPUS:0006668954
SN - 0021-9614
VL - 3
SP - 61
EP - 76
JO - The Journal of Chemical Thermodynamics
JF - The Journal of Chemical Thermodynamics
IS - 1
ER -