Electrical and magnetic properties of La1-xCexRu4P12 and CeOs4P12 with theskutterudite structure

Citation
I. Shirotani et al., Electrical and magnetic properties of La1-xCexRu4P12 and CeOs4P12 with theskutterudite structure, J SOL ST CH, 142(1), 1999, pp. 146-151
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
JOURNAL OF SOLID STATE CHEMISTRY
ISSN journal
0022-4596 → ACNP
Volume
142
Issue
1
Year of publication
1999
Pages
146 - 151
Database
ISI
SICI code
0022-4596(199901)142:1<146:EAMPOL>2.0.ZU;2-Y
Abstract
The crystal structures of LaRu4P12 and CeRu4P12 are refined by the Rietveld analysis of the powder X-ray diffraction data. The bond distances and bond angles in both phosphides are obtained. La1-xCexRu4P12(x = 0, 0.1, 0.2, 0. 3, 0.4, 0.5, 0.6, 0.7, 0.75, 0.8, 0.9, and 1) and CeOs4P12 are prepared at high temperatures and high pressures. Powder X-ray diffractions of the allo ys are studied at room temperature. The lattice parameters of the alloys do not change linearly with increasing x and markedly deviate from linear bet ween x<0.4 and x = 0.6. The formal oxidation number of Ce atoms in the allo ys is +3 below x = 0.6. The electrical and magnetic properties of the alloy s CeRu4P12 and CeOs4P12 are studied at low temperatures. The metal-to-insul ator transition and magnetic ordering appear at around x = 0.6. Above x = 0 .7 the alloys behave as a semiconductor. CeOs4P12 exhibits a semiconducting behavior,with an activation energy of 0.034 eV. CeRu4P12 and CeOs4P12 show a very small, nearly temperature-independent susceptibility. Electrical an d magnetic properties of the alloys, CeRu4P12 and CeOs4P12 are discussed. ( C) 1999 Academic Press.