Abstract
Abstract The crystal structures of BiNdSr 2 O 6 and BiLuSr 2 O 6 have been investigated using both X-ray powder diffraction method and electron microscopy: selected area electron diffraction and high resolution transmission electron microscopy connected with crystallographic image processing and multislice image simulation technique. Both crystal structures have been refined from the X-ray data by the Rietveld method in P12 1 / n 1 space group giving atomic arrangements known earlier from the single crystal data for BiNdSr 2 O 6 , and the following lattice parameters: a =5.9433(2) A, b =6.0976(3) A, c =8.4966(3) A, β =90.207(3)°, and a =5.8564(2) A, b =5.9245(2) A, c =8.3151(4) A, β =90.094(4)°; for BiNdSr 2 O 6 and BiLuSr 2 O 6 , respectively. Electron microscopy studies confirmed these results, but additionally for BiNdSr 2 O 6 allowed to find the superstructure with the following superstructure unit cell: a s =6.097(2) A, b s =14.609(3) A, c s =10.368(2) A, α =90°, β =90°, γ =90.26(2)°; and with a unit cell volume three times larger than the basic one.
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