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Scientific article
English

Structural characterization of the Ta-rich part of the Ta–Al system

Published inJournal of solid state chemistry, vol. 179, no. 11, p. 3385-3393
Publication date2006
Abstract

The Ta-rich part of the Ta-Al system has been investigated. On the one hand, the accommodation of the non-stoichiometry in the σ phase has been studied by Rietveld refinement of X-ray powder data obtained from different samples on both sides of the ideal composition (Ta2Al, P42/mnm, tP30). On the other hand, the structure of the β phase has been determined ab initio from powder synchrotron data (analyzed composition Ta50.7Al49.3, refined composition Ta52.6(5)Al47.4(5) (Ta45.2(4)Al40.8(4)), stoichiometric composition Ta48Al38, mP86, P21/c, a = 9.8707(1)Å, b = 9.8766(1)Å, c = 16.3539(2), β = 116.478(1), RB = 2.6%). This phase is shown to be closely related to the group of the topologically close packed phases. In addition, phase relations have been accurately determined in the Ta-rich end of the system.

Keywords
  • Al–Ta
  • σ phase
  • Frank–Kasper phases
  • Intermetallic compound
  • Non-stoichiometry
  • Rietveld refinement
  • Ab initio powder structure determination
Research group
Citation (ISO format)
BOULINEAU, A., JOUBERT, J.-M., CERNY, Radovan. Structural characterization of the Ta-rich part of the Ta–Al system. In: Journal of solid state chemistry, 2006, vol. 179, n° 11, p. 3385–3393. doi: 10.1016/j.jssc.2006.07.001
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ISSN of the journal0022-4596
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