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Title: Synthesis, crystal and electronic structure, and physical properties of the new lanthanum copper telluride La{sub 3}Cu{sub 5}Te{sub 7}

The new lanthanum copper telluride La{sub 3}Cu{sub 5-x}Te{sub 7} has been obtained by annealing the elements at 1073 K. Single-crystal X-ray diffraction studies revealed that the title compound crystallizes in a new structure type, space group Pnma (no. 62) with lattice dimensions of a=8.2326(3) A, b=25.9466(9) A, c=7.3402(3) A, V=1567.9(1) A{sup 3}, Z=4 for La{sub 3}Cu{sub 4.86(4)}Te{sub 7}. The structure of La{sub 3}Cu{sub 5-x}Te{sub 7} is remarkably complex. The Cu and Te atoms build up a three-dimensional covalent network. The coordination polyhedra include trigonal LaTe{sub 6} prisms, capped trigonal LaTe{sub 7} prisms, CuTe{sub 4} tetrahedra, and CuTe{sub 3} pyramids. All Cu sites exhibit deficiencies of various extents. Electrical property measurements on a sintered pellet of La{sub 3}Cu{sub 4.86}Te{sub 7} indicate that it is a p-type semiconductor in accordance with the electronic structure calculations. -- Graphical abstract: Oligomeric unit comprising interconnected CuTe{sub 3} pyramids and CuTe{sub 4} tetrahedra. Display Omitted Research highlights: {yields} La{sub 3}Cu{sub 5-x}Te{sub 7} adopts a new structure type. {yields} All Cu sites exhibit deficiencies of various extents. {yields} The coordination polyhedra include trigonal LaTe{sub 6} prisms, capped trigonal LaTe{sub 7} prisms, CuTe{sub 4} tetrahedra and CuTe{sub 3} pyramids. {yields} La{sub 3}Cu{sub 5-x}Te{sub 7} is a p-type semiconductor.
Authors:
;  [1] ;  [1]
  1. Department of Chemistry, University of Waterloo, Waterloo, ON, Canada N2L 3G1 (Canada)
Publication Date:
OSTI Identifier:
21494215
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 184; Journal Issue: 3; Other Information: DOI: 10.1016/j.jssc.2011.01.002; PII: S0022-4596(11)00003-X; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANNEALING; COPPER TELLURIDES; ELECTRICAL PROPERTIES; ELECTRONIC STRUCTURE; LANTHANUM TELLURIDES; MONOCRYSTALS; ORTHORHOMBIC LATTICES; SEMICONDUCTOR MATERIALS; SPACE GROUPS; SYNTHESIS; TEMPERATURE RANGE 1000-4000 K; X-RAY DIFFRACTION CHALCOGENIDES; COHERENT SCATTERING; COPPER COMPOUNDS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; CRYSTALS; DIFFRACTION; HEAT TREATMENTS; LANTHANUM COMPOUNDS; MATERIALS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SCATTERING; SYMMETRY GROUPS; TELLURIDES; TELLURIUM COMPOUNDS; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS