Abstract
By X-ray powder diffraction, the structure of polycrystalline lead-free oxides K4Bi2Nbl0O30 and Na2Sr4Nb10O30 was refined with an emphasis on ordering in the A-sites of the tetragonal tungsten bronze crystal lattice. It was shown that the studied oxides have different types of cationic ordering, which does not change at ferroelectric phase transition. The results are consistent with the piezoresponse force microscopy data.
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