Abstract
The heat capacities of , , , and were measured from 1.2 to 20 K and that of from 0.3 to 20 K. The heat capacities of the two samples and the sample exhibited only a dependence, i.e., the electronic specific constant was found to be zero within ±0.02 mJ/g-at.. This indicates that these materials are insulators or semiconductors. The temperature dependence of the heat capacity of the two substoichiometric samples exhibited both and dependences. The small values indicated that some conduction electrons were present, and that the stoichiometric would be a semiconductor or insulator.
- Received 10 July 1981
DOI:https://doi.org/10.1103/PhysRevB.24.7187
©1981 American Physical Society