Abstract
A series of Bi 2(Ga x Al 1− x ) 4O 9 solid solutions (0≤ x≤1), prepared by mechanochemical processing of Bi 2O 3/Ga 2O 3/Al 2O 3 mixtures and subsequent annealing, was investigated by XRD, EDX, and 27Al MAS NMR. The structure of the Bi 2(Ga x Al 1− x ) 4O 9 solid solutions is found to be orthorhombic, space group Pbam (No. 55). The lattice parameters of the Bi 2(Ga x Al 1− x ) 4O 9 series increase linearly with increasing gallium content. Rietveld refinement of the XRD data as well as the analysis of the 27Al MAS NMR spectra show a preference of gallium cations for the tetrahedral sites in Bi 2(Ga x Al 1− x ) 4O 9. As a consequence, this leads to a far from random distribution of Al and Ga cations across the whole series of solid solutions.
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