Author： Ohtani T. Honji S. Takano M.
Publisher： Academic Press
ISSN： 0022-4596
Source： Journal of Solid State Chemistry, Vol.132, Iss.1, 1997-08, pp. : 188-195
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Abstract
Samples with various compositions around BaNbSe3 were prepared. X-ray analysis revealed that the compound is stable at the composition of BaNb0.80Se3, which formally requires Nb5+ ions (d0). The single-phase region extends to the composition BaNb0.95Se3. A semiconductor-to-metal transition was observed at =~140 K in BaNb0.95Se3. Seebeck measurements showed that the dominant carriers were electrons, which are considered to originate from Nb4+ ions (d1) coexisting with Nb5+ ions. On the basis of detailed phase study, the transition was revealed to be intrinsic to BaNb0.95Se3 with a very slight Ba deficiency. BaNb0.95Se3 with a slight Ba excess shows a semiconductor-to-semiconductor transition at 200-300 K. Seebeck measurements showed that the dominant carriers are electrons above the transition and are holes below the transition. A new compound, BaNb2Se5 with a BaTa2S5-type structure, was found to show superconductivity at 2.5 K.
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