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New fluorite-related quaternary rare earth oxides Ln $${\text{Ln}}_{2}^{\prime }$$ Ln 2 ′ MO7 (Ln = Nd, Gd, Tb; Ln′ = Lu and Y; M = Nb, Sb, Ta) were prepared. They crystallize in an orthorhombic superstructure of cubic fluorite with space group C2221. The results of the Rietveld analysis indicate that there exists some disordering of the Ln and Ln′ atoms at the eight-coordinate site and...
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