Resolution of Heat-Capacity Curves for Crystalline Substances

抄録

Resolution of excess heat capacities of many types of transitions-whether structural or electronic, or otherwise-requires a reliable estimate of the lattice contribution. This besetting problem has confronted thermophysicists for decades. Corresponding state theories have been less than satisfactory; Lindemann schemes are suggestive. For chemical thermodynamic purposes use of a volume-weighted scheme over the range where entropy development largely occurs is demonstrated to provide resolution of Schottky contributions for Ln (OH)₃ and LnCl₃ systems and has been shown to be superior to other approaches. Application to estimation of heat capacities (entropies, etc.) and to extrapolation of results to pure end-member composition in geothermodynamic problems are considered.