Thermodynamics of the lanthanide trifluorides. IV. The heat capacities of gadolinium trifluoride GdF3, lutetium trifluoride LuF3, and yttrium trifluoride YF3 from 5 to 350 °K

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Abstract
The heat capacities of three isostructural trifluorides GdF3, LuF3, and YF3 were determined from 5 to 350 °K by adiabatic calorimetry. Below 15 °K GdF3 contained an excess heat capacity contribution over the usual lattice heat capacity; LuF3 and YF3 showed no unusual heat capacities over the entire temperature range. Results in tabular form which list the heat capacity C°p, the entropy S°, the enthalpy [H°(T)−H°(0)], and the Planck function −[G°(T)−H°(T)]/T are given for the three trifluorides. Also presented are recommended thermochemical functions at 298.15 °K and tables of recommended high‐temperature thermodynamic functions from 400 °K to the melting temperatures. The excess entropy associated with GdF3 is discussed and values of the lattice heat capacity of GdF3 below 15 °K are estimated.