The magnetic transition, heat capacity, and thermodynamic properties of uranium dioxide from 5 to 350 K

James J. Huntzicker; Edgar F. Westrum

doi:10.1016/S0021-9614(71)80067-8

The magnetic transition, heat capacity, and thermodynamic properties of uranium dioxide from 5 to 350 K

James J. Huntzicker, Edgar F. Westrum

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Abstract

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 C_p of 391 cal mol^-1 K^-1. The heat capacity at constant pressure C_p, 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.

Original language	English (US)
Pages (from-to)	61-76
Number of pages	16
Journal	The Journal of Chemical Thermodynamics
Volume	3
Issue number	1
DOIs	https://doi.org/10.1016/S0021-9614(71)80067-8
State	Published - Jan 1971
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Physical and Theoretical Chemistry

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10.1016/S0021-9614(71)80067-8

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title = "The magnetic transition, heat capacity, and thermodynamic properties of uranium dioxide from 5 to 350 K",

abstract = "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.",

author = "Huntzicker, {James J.} and Westrum, {Edgar F.}",

note = "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.",

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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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The magnetic transition, heat capacity, and thermodynamic properties of uranium dioxide from 5 to 350 K

Abstract

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