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

Boulineau, A.
Joubert, J.-M.
Published in Journal of Solid State Chemistry. 2006, vol. 179, no. 11, p. 3385-3393
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–Taσ phaseFrank–Kasper phasesIntermetallic compoundNon-stoichiometryRietveld refinementAb initio powder structure determination
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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. https://archive-ouverte.unige.ch/unige:35495

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Deposited on : 2014-04-08

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