Abstract
Measurements of the heat capacity by quasi-adiabatic, intermittent energy increments from 5 to 350 K show small high heat-capacity anomalies near 7 and 10 K which are attributed to superconducting transitions seen by magnetic measurements on the same carefully synthesized and well-characterized sample of (Hf0.934Zr0.057)(N0.97). Although no previous heat capacity measurements over the cryogenic region are known, the estimated 298.15 K standard entropy values (S/R) vary in the literature from about 200 per cent higher to 5 per cent lower than our measured value of (5.28±0.01)R−1 when the formula is represented as above. A simple scheme to represent and predict values based on both molar volumes and atomic masses for related materials is presented which seems more reliable on a limited sample than do others despite the intrusion of lanthanide contraction.
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Westrum, E.F., Sommers, J.A. Heat capacity of hafnium mononitride from temperatures of 5 to 350 K: An estimation procedure. Journal of Thermal Analysis and Calorimetry 69, 103–112 (2002). https://doi.org/10.1023/A:1019937723458
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DOI: https://doi.org/10.1023/A:1019937723458