Magnetic susceptibility of CfCl3 and its dependence on crystal structure |
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| Affiliation: | 1. Departamento de Geología, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Carretera Ensenada-Tijuana 3918, Ensenada, Baja California, Mexico;2. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, Via U. La Malfa, 153, 90146 Palermo, Italy;3. Centro de Investigaciones en Ciencias Geológicas, Universidad de Costa Rica, Costa Rica;4. Escuela Centroamericana de Geología, Universidad de Costa Rica, Costa Rica;5. Laboratorio de Ecología Urbana, Universidad Estatal a Distancia, Costa Rica;6. Volcanes Sin Fronteras, Costa Rica;7. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Via Donato Creti 12, Bologna, Italy |
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| Abstract: | Magnetic measurements are presented for polycrystalline samples of californium trichloride in both a hexagonal (UC13 type; californium(III) CN = 9) and an orthorhombic (PuBr3 type; californium(III) CN = 8) crystal form. In the Curie-Weiss temperature regions (orthorhombic, 100–340 K, hexagonal, 60–340 K) the Weiss constant θp is significantly larger for the orthorhombic form. As the temperature decreases, the susceptibility of the orthorhombic form begins to deviate from Curie-Weiss behavior at a higher temperature than the hexagonal form indicating a larger crystal-field splitting in the orthorhombic form. At temperatures below 15 K a field-dependent transition is observed. In a field of 5 kG an antiferromagnetic maximum in the susceptibility is observed at 7 K and 13 K for the hexagonal and orthorhombic forms respectively. For 30 kG both types exhibit monotonically increasing susceptibilities with decreasing temperature and the hexagonal form shows saturation behavior in the susceptibility vs. temperature plots with a saturation moment of about 6μB atom−1. |
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