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Selected-area electron-diffraction patterns and x-ray diffraction powder patterns were taken of crushed single crystals of Pb 3 MgNb 2 O 9 . Although the x-ray patterns did not indicate any deviation from the cubic perovskite structure, the single-crystal electron-diffraction patterns showed additional spots which were attributed to a superlattice. Those superlattices which are compatible with the experimental data were derived. The diffuse phase transition of Pb 3 MgNb 2 O 9  and the direction in which the spontaneous polarization occurs may be explained by the proposed  B -site ordering.

Ordering of Mg and Nb in the octahedral positions of the “cubic” perovskite structure of Pb 3 MgNb 2 O 9