Structure and physical properties of the new layered ternary chalcogenides Ta/sub 2/NiS/sub 5/ and Ta/sub 2/NiSe/sub 5/

Journal Article · Wed Oct 23 00:00:00 EDT 1985 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic00216a027· OSTI ID:5906336

Sunshine, S A; Ibers, J A

Two new ternary chalcogenides have been prepared and characterized. Both Ta/sub 2/NiS/sub 5/ (D/sub 2h//sup 17/-Cmcm; a = 3.415 (1), b = 12.146 (3), c = 15.097 (4) A) and Ta/sub 2/NiSe/sub 5/ (C/sub 2h//sup 6/-C2/c; a = 3.496 (1), b = 12.829 (3), c = 15,641 (4) A; ..beta.. = 90.53 (1)/sup 0/) crystallize as layered structures with four formula units per cell. These layers contain octahedral tantalum atoms and tetrahedral nickel atoms each coordinated by chalcogen atoms. These polyhedra join via shared edges to form zigzag chains along the c axis. Electrical conductivity and magnetic susceptibility measurements show these materials to be diamagnetic semiconductors. The description of the structures as Ta/sup 4 +/Ni/sup 2 +/Q/sup 2 -/ (Q = S, Se) with pairing of nickel and tantalum electrons is consistent with these physical properties. 21 references, 4 figures, 6 tables.

• Research Organization: Northwestern Univ., Evanston, IL
• OSTI ID: 5906336
• Journal Information: Inorg. Chem.; (United States), Vol. 24:22
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL SELENIDES
CRYSTAL STRUCTURE
PHYSICAL PROPERTIES
NICKEL SULFIDES
TANTALUM SELENIDES
TANTALUM SULFIDES
BOND ANGLE
BOND LENGTHS
EXPERIMENTAL DATA
LAYERS
SEMICONDUCTOR DEVICES
CHALCOGENIDES
DATA
DIMENSIONS
INFORMATION
LENGTH
NICKEL COMPOUNDS
NUMERICAL DATA
REFRACTORY METAL COMPOUNDS
SELENIDES
SELENIUM COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
TANTALUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties