Phase transitions in quasi-one-dimensional chalcogenides of BaNb{sub x}S{sub 3} and BaTa{sub x}Se{sub 3}

Journal Article · Fri Apr 02 04:00:00 EST 2004 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2003.12.015· OSTI ID:20888038

Ohtani, T; Sawada, H; Chikamori, M

BaNbS{sub 3} phase was found to be stable in the composition range between x=0.85 and 0.97 for BaNb{sub x}S{sub 3}. The conduction nature was varied from semiconductive to metallic with increasing Nb content. Semiconductor-to-metal (S-M) transition was observed at {approx}170 and {approx}250 K in BaNb{sub 0.95}S{sub 3} and BaNb{sub 0.97}S{sub 3}, respectively. BaTaSe{sub 3} phase was stable in the range between x=0.90 and 0.95 for BaTa{sub x}Se{sub 3}. BaTa{sub x}Se{sub 3} with x=0.90 and 0.95 showed a semiconductor-to-semiconductor transition at {approx}140 K, which is characterized by a large jump of the resistivity from {approx}10{sup 6} to {approx}10{sup 12} {omega} cm. Seebeck measurements showed electron conduction in both BaNb{sub x}S{sub 3} and BaTa{sub x}Se{sub 3}.

• OSTI ID: 20888038
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 4-5 Vol. 39; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHALCOGENIDES
ELECTRICAL PROPERTIES
METALS
PHASE TRANSFORMATIONS
SEMICONDUCTOR MATERIALS
X-RAY DIFFRACTION