Structure, electrical transport, and magnetic properties of the misfit layer compound (PbS) sub 1. 13 TaS sub 2

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Journal of Solid State Chemistry; (USA)

DOI:https://doi.org/10.1016/0022-4596(90)90190-9· OSTI ID:6667571

Wulff, J; Meetsma, A; Van Smaalen, S; Haange, R J; De Boer, J L; Wiegers, G A ^[1]

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1. Materials Science Centre of the Univ., Groningen (Netherlands)

(PbS){sub 1.13}TaS{sub 2}, formerly designated PbTaS{sub 3}, has been found by single-crystal x-ray diffraction to be a misfit layer compound characterized by two face-centered orthorhombic unit cells each with space group Fm2m. One belongs to the PbS part of the structure (a = 5.825 {angstrom}, b = 5.779 {angstrom}, c = 23.96 {angstrom}, Z = 8), the other belongs to the TaS{sub 2} part of the structure (a{prime} = 3.304 {angstrom}, b{prime} = 5.779 {angstrom}, c{prime} = 23.96 {angstrom} Z = 4). The corresponding axes are parallel; the ratio of the lengths of the misfit a axes, a/a{prime} is irrational, but close to 7/4. The compound is built of alternately double layers of PbS with distorted NaCl-type structure and TaS{sub 2} sandwiches, with Ta in distorted trigonal prisms of sulfur. Along the c axes of length 23.96 {angstrom}, four units are stacked; units of the same type but ({1/2})c apart are displaced with respect to each other over ({1/2})b. The symmetry of the complete structure is analyzed in terms of a four-dimensional superspace group. The electrical transport and magnetic properties are related to those of 2H-TaS{sub 2}. The conduction is metallic and strongly anisotropic, the in-plane resistivity being about 10{sup 5} smaller than the resistivity along the c axis. The Hall coefficient, with positive sign, corresponds with an electron donation from PbS to TaS{sub 2}. The Seebeck coefficient is negative like that in other intercalates of 2H-TaS{sub 2}. The compound is Pauli-paramagnetic.

• OSTI ID: 6667571
• Journal Information: Journal of Solid State Chemistry; (USA), Journal Name: Journal of Solid State Chemistry; (USA) Vol. 84:1; ISSN JSSCB; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
DATA ANALYSIS
DIFFRACTION
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
HALL EFFECT
INFORMATION
LEAD COMPOUNDS
LEAD SULFIDES
MAGNETIC PROPERTIES
MAGNETISM
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
PARAMAGNETISM
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SCATTERING
SEEBECK EFFECT
SULFIDES
SULFUR COMPOUNDS
TANTALUM COMPOUNDS
TANTALUM SULFIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION