Synthesis and characterization of new novel ternary niobium and tantalum tellurides
Background information, general remarks, and an introduction to the area of ternary group V tellurides are given in Chapter 1. The synthesis, single crystal structure determination and physical characterization of the new infinite chain compound Ta[sub 4]SiTe[sub 4] are described in Chapter 2. The compound crystallizes in the space group Pbam with Z = 2, a = 10.52, b = 18.275, c = 4.799 [angstrom]. X-ray powder diffraction results indicate the existance of a group of isostructural compounds with Si replaced by Cr, Fe, Co, and Ni and Ta by Nb. The temperature dependence of the electrical resistivity and magnetic susceptibility of the compounds Ta[sub 4]MTe[sub 4] (M = Cr, Fe, Co, Ni) show they are metals with strong scattering typical telluride TaFe[sub 1.25]Te[sub 3]. The compound crystallizes in the space group with Z = 2, a = 7.436(1), b = 3.638(1), c = 10.008(1) [angstrom], and [beta] = 109.17(1). Electrical resistivity and magnetic susceptibility measurements show the compound is an antiferromagnetic metal with a Neel temperature of 200 K. Chapter 4 describes a neutron powder diffraction and single crystal magnetic susceptibility study of the magnetic structure of TaFe[sub 1.25]Te[sub 3]. The magnetic supercell corresponds to a doubling along a and c. Both experiments suggest the moments lie in the mirror plane perpendicular to b.
- Research Organization:
- Cornell Univ., Ithaca, NY (United States)
- OSTI ID:
- 7207565
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
CHALCOGENIDES
CRYSTAL STRUCTURE
NIOBIUM COMPOUNDS
NIOBIUM TELLURIDES
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SYNTHESIS
TANTALUM COMPOUNDS
TANTALUM TELLURIDES
TELLURIDES
TELLURIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS