The heat capacity of a sample of LaF3 was determined in the temperature range 5-350°K by aneroid adiabatic calorimetry and the enthalpy from 298.15 to 1477°K by drop calorimetry. The heat capacity at constant pressure C°p(298.15°K), the entropy S°(298.15°K), the enthalpy [H°(298.15°K)-H°(0)] and the Planck function -[G°(298.15°K)-H°(0)]/298.15°K; were found to be (90.29±0.09) J °K-1·mole-1, (106.98±0.11) J °K-1·mole-1, (16717±17) J mole-1, and (50.91±0.05) J °K -1·mole-1. The thermal functions from the present research were extended up to the melting temperature (1766°K) by combination with previously published results. The anomalously high heat capacity from about 1100 to 1766°K is discussed.
W. G. Lyon et al., "Thermodynamics of the Lanthanide Trifluorides. I. The Heat Capacity of Lanthanum Trifluoride, LaF3 from 5 to 350°K and Enthalpies from 298 to 1477°K," The Journal of Chemical Physics, vol. 69, no. 1, pp. 167-173, American Institute of Physics (AIP), Jul 1978.
The definitive version is available at http://dx.doi.org/10.1063/1.436381
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