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The structure of Co 2 Al 5 ( hP 28, P 6 3 / mmc ) was refined by means of Rietveld method. The shortest Co–Al distance amounts 2.338 Å. Co 2 Al 5 shows a homogeneity range between Co 29 Al 71 and Co 27.5 Al 72.5 at 1125 K. The concentration dependence of lattice parameters was also measured. The axial ratio c / a increases with increasing mole fraction of aluminum.
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Burkhardt et al. (1998) studied this question.
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