High-pressure syntheses of TaS/sub 3/, NbS/sub 3/, TaSe/sub 3/, and NbSe/sub 3/ with NbSe/sub 3/-type crystal structure
Journal Article
·
· J. Solid State Chem.; (United States)
- Osaka Univ., Japan
Transition metal trichalcogenides TaSe/sub 3/, TaSe/sub 3/, NbSe/sub 3/ and NbS/sub 3/ were prepared under the reaction conditions of 2 GPa, 700/sup 0/C, 30 min. NbSe/sub 3/ is exactly the same as that obtained in the usual sealed-tube method. The other products are modifications of each usual phase. They have crystal structures very similar to that of NbSe/sub 3/. The lattice parameters are a = 10.02 angstrom, b = 3.48 angstrom, c = 15.56 angstrom, ..beta.. = 109.6/sup 0/ for TaSe/sub 3/, a = 9.52 angstrom, b = 3.35 angstrom, c = 14.92 angstrom, ..beta.. = 110.0/sup 0/ for TaS/sub 3/, and a = 9.68 angstrom, b = 3.37, c = 14.83 angstrom, ..beta.. = 109.9/sup 0/ for NbS/sub 3/. In spite of the similarity in their crystal structures, these high-pressure phases show a variety of electrical transport properties. TaSe/sub 3/ is a superconductor having T/sub c/ at 1.9 K. TaSe/sub 3/ is a semiconductor with two transitions at 200 and 250 K. NbS/sub 3/ is a semiconductor with E/sub a/ = 180 MeV.
- OSTI ID:
- 5227372
- Journal Information:
- J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 41:3; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
CHALCOGENIDES
CHEMICAL PREPARATION
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EXPERIMENTAL DATA
GRAPHS
HIGH PRESSURE
INFORMATION
LATTICE PARAMETERS
METALS
NIOBIUM COMPOUNDS
NIOBIUM SELENIDES
NIOBIUM SULFIDES
NUMERICAL DATA
PHYSICAL PROPERTIES
SCATTERING
SELENIDES
SELENIUM COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
TANTALUM COMPOUNDS
TANTALUM SELENIDES
TANTALUM SULFIDES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION
360601* -- Other Materials-- Preparation & Manufacture
CHALCOGENIDES
CHEMICAL PREPARATION
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EXPERIMENTAL DATA
GRAPHS
HIGH PRESSURE
INFORMATION
LATTICE PARAMETERS
METALS
NIOBIUM COMPOUNDS
NIOBIUM SELENIDES
NIOBIUM SULFIDES
NUMERICAL DATA
PHYSICAL PROPERTIES
SCATTERING
SELENIDES
SELENIUM COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
TANTALUM COMPOUNDS
TANTALUM SELENIDES
TANTALUM SULFIDES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION