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

Boulineau, A.; Joubert, J.-M.; Cerny, Radovan

doi:10.1016/j.jssc.2006.07.001

Scientific article

English

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

ContributorsBoulineau, A.; Joubert, J.-M.; Cerny, Radovan

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

Affiliation entities

Faculté des sciences / Section de physique / Département de physique de la matière quantique

Research groups

Groupe Cerny

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

Article (Published version)

Identifiers

PID : unige:35495
DOI : 10.1016/j.jssc.2006.07.001

Additional URL for this publicationhttp://linkinghub.elsevier.com/retrieve/pii/S0022459606003859

Journal ISSN0022-4596

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

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