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Title: Two new titanium molybdenum arsenides: Ti{sub 2}MoAs{sub 2} and Ti{sub 3}MoAs{sub 3}, ternary substitution variants of V{sub 3}As{sub 2} and {beta}-V{sub 4}As{sub 3}

The title compounds were prepared by arc-melting pre-annealed mixtures of Ti, Mo, and As. Both Ti{sub 2}MoAs{sub 2} and Ti{sub 3}MoAs{sub 3} adopt structures formed by the corresponding binary vanadium arsenides, V{sub 3}As{sub 2} and {beta}-V{sub 4}As{sub 3}. Ti{sub 2}MoAs{sub 2} crystallizes in the tetragonal space group P4/m, with a=9.706(4) A, c=3.451(2) A, V=325.1(3) A{sup 3} (Z=4), and Ti{sub 3}MoAs{sub 3} in the monoclinic space group C2/m, with a=14.107(3) A, b=3.5148(7) A, c=9.522(2) A, {beta}=100.66(3){sup o}, V=464.0(2) A{sup 3} (Z=4). In both cases, the metal atoms form infinite chains of trans edge-condensed octahedra, and the As atoms are located in (capped) trigonal prismatic voids. While most metal atom sites exhibit mixed Ti/Mo occupancies, the Mo atoms prefer the sites with more metal atom and fewer As atom neighbors. Ti{sub 2}MoAs{sub 2} and Ti{sub 3}MoAs{sub 3} are metallic entropy-stabilized materials that decompose upon annealing at intermediate temperatures.
Authors:
 [1] ;  [1] ;  [1] ;  [2]
  1. Department of Chemistry, University of Waterloo, Waterloo, Ont., N2L 3G1 (Canada)
  2. Department of Chemistry, University of Waterloo, Waterloo, Ont., 2L 3G1 (Canada). E-mail: kleinke@uwaterloo.ca
Publication Date:
OSTI Identifier:
20784884
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 179; Journal Issue: 2; Other Information: DOI: 10.1016/j.jssc.2005.11.007; PII: S0022-4596(05)00520-7; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANNEALING; ELECTRONIC STRUCTURE; MELTING; MOLYBDENUM ARSENIDES; MONOCLINIC LATTICES; SPACE GROUPS; TITANIUM COMPOUNDS; VANADIUM COMPOUNDS