Structure and physical properties of the barium niobium sulfides BaNbS{sub 3} and BaNb{sub 0.8}S{sub 3-{delta}}

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1995.1155· OSTI ID:75769

Kim, Sung-Jin; Bae, Hyun-Sook; Yee, Kyeong-Ae ^[1]; Choy, Jin-Ho; Kim, Dong-Kuk ^[2]; Hur, Nan-Hwi

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1. Ewha Womans Univ., Seoul (Korea, Democratic People`s Republic of)
2. Seoul National Univ. (Korea, Democratic People`s Republic of)

BaNb{sub 0.8}S{sub 3-{delta}} and BaNbS{sub 3} were prepared by heating desired amounts of BaCO{sub 3} and Nb{sub 2}O{sub 5} under CS{sub 2}/N{sub 2} flow. The authors found that nominal composition of BaNb{sub 0.8}S has sulfur defect, and therefore should be written as BaNb{sub 0.8}S{sub 3-{delta}}. XANES experiments of Nb K-edges and XPS experiments proved that the oxidation state of Nb is the same in BaNb{sub 0.8}S{sub 3-{delta}} and BaNbS{sub 3}. To understand their structures, the electronic and physical properties of the BaMX{sub 3} (M = V, Nb, X = S; M = Ta, X = S, Se) phases are compared. In spite of their structural similarity, they exhibit rather different physical properties. It has been known that BaVS{sub 3} is a metal and undergoes a metal to semiconductor transition at 130 K, and this phase shows the ferro/antiferromagnetic transition at a lower temperature. However, BaNbS{sub 3} and BaTaS{sub 3} are diamagnetic semiconductors at room temperature. The major factor stabilizing the semiconducting state for BaTaX{sub 3} and BaNbS{sub 3} may be a large spin-orbit coupling rather than a structural distortion.

• OSTI ID: 75769
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 115; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
BARIUM SULFIDES
CHEMICAL PREPARATION
CRYSTAL DEFECTS
L-S COUPLING
NIOBIUM SULFIDES
PHASE STUDIES
PHOTOELECTRON SPECTROSCOPY
PHYSICAL PROPERTIES
SEMICONDUCTOR MATERIALS
STOICHIOMETRY
X-RAY SPECTROSCOPY