Electrical and magnetic properties of La{sub 1{minus}x}Ce{sub x}Ru{sub 4}P{sub 12} and CeOs{sub 4}P{sub 12} with the skutterudite structure
- Muroran Inst. of Tech. (Japan)
- Ochanomizu Univ., Tokyo (Japan). Faculty of Science
The crystal structures of LaRu{sub 4}P{sub 12} and CeRu{sub 4}P{sub 12} are refined by the Rietveld analysis of the powder X-ray diffraction data. The bond distances and bond angles in both phosphides are obtained. La{sub 1{minus}x}Ce{sub x}Ru{sub 4}P{sub 12} (x = 0, 01, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.75, 0.8, 0.9, and 1) and CeOs{sub 4}P{sub 12} are prepared at high temperatures and high pressures. Powder X-ray diffractions of the alloys are studied at room temperature. The lattice parameters of the alloys do not change linearly with increasing x and markedly deviate from linear between x < 0.4 and x = 0.6. The formal oxidation number of Ce atoms in the alloys is +3 below x = 0.6. The electrical and magnetic properties of the alloys CeRu{sub 4}P{sub 12} and CeOs{sub 4}P{sub 12} are studied at low temperatures. The metal-to-insulator transition and magnetic ordering appear at around x = 0.6. Above x = 0.7 the alloys behave as a semiconductor. CeOs{sub 4}P{sub 12} exhibits a semiconducting behavior, with an activation energy of 0.034 eV. CeRu{sub 4}P{sub 12} and CeOs{sub 4}P{sub 12} show a very small, nearly temperature-independent susceptibility. Electrical and magnetic properties of the alloys, CeRu{sub 4}P{sub 12} and CeOs{sub 4}P{sub 12} are discussed.
- OSTI ID:
- 329129
- Journal Information:
- Journal of Solid State Chemistry, Vol. 142, Issue 1; Other Information: PBD: Jan 1999
- Country of Publication:
- United States
- Language:
- English
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