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Rb2NaTF6 and Cs2NaTF6 fluorides, with T = Yb, Er, Ho, Y, Tb and Sm, belong to the cubic system [space group Fm3m (O^{5}_{h})]. Lattice parameters (near to 9 Å), indices, intensities and spacings are tabulated for the whole series. They are ordered perovskites. The cations are in parameterless positions. The parameters of the F- ions have been determined in Rb2NaErF6 and Cs2NaErF6.

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