Abstract
The crystal structures of BiNdSr2O6 and BiLuSr2O6 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 P121/n1 space group giving atomic arrangements known earlier from the single crystal data for BiNdSr2O6, and the following lattice parameters: a=5.9433(2) Å, b=6.0976(3) Å, c=8.4966(3) Å, β=90.207(3)°, and a=5.8564(2) Å, b=5.9245(2) Å, c=8.3151(4) Å, β=90.094(4)°; for BiNdSr2O6 and BiLuSr2O6, respectively. Electron microscopy studies confirmed these results, but additionally for BiNdSr2O6 allowed to find the superstructure with the following superstructure unit cell: as=6.097(2) Å, bs=14.609(3) Å, cs=10.368(2) Å, 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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