Abstract
Results of magnetic measurements are presented for polycrystalline samples of (both the hexagonal--type and orthorhombic--type crystal structures) and (monoclinic--type). Measurements were performed at temperatures between 4.2 and 340 K and in magnetic fields of up to 50 kG. The effective paramagnetic moments, , and the Weiss constants, , have been determined in the Curie-Weiss temperature region (150–340 K). In the trifluorides no significant differences in and were observed as a function of crystal structure or sample age (radiation damage). For the tetrafluoride, two distinct sets of values for and were obtained depending on the sample age. Antiferromagnetic ordering was observed in both Cf compounds at temperatures below 12 K. Crystal-field effects were evident in the temperature range between about 12 and 150 K. The calculated susceptibilities for these compounds are presented and discussed.
- Received 29 December 1989
DOI:https://doi.org/10.1103/PhysRevB.41.9045
©1990 American Physical Society