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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 (Ta 2 Al, P4 2 /mnm, tP30). On the other hand, the structure of the β phase has been determined ab initio from powder...
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