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The centrosymmetric structure of Co2Al9 (space group P21/c, Pearson symbol mP22), the isotypic structures of Rh2Al9 and Ir2Al9 and the slightly distorted acentric structures of Rh2Ga9 and Ir2Ga9 (space group Pc) were reinvestigated from single crystal X‐ray diffraction data. The structure of Rh2Ga9 represents a new structure type. The difference between the aluminides and the gallides originates in the details of atomic interactions investigated by the electron localization function and band structure calculations.
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Boström et al. (2005) studied this question.
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