Abstract
The Sr 1.32Mn 0.83Cu 0.17O 3 compound has been prepared by solid state reaction in an evacuated sealed silica tube at 1000 °C. The crystal structure of Sr 1.32Mn 0.83Cu 0.17O 3 was studied by means of electron diffraction, high resolution electron microscopy and was refined from X-ray powder diffraction data ( R I=0.042, R P=0.016). The compound belongs to the A 3 m+3 n A′ n B 3 m+ n O 9 m+6 n family of hexagonal perovskites. Its incommensurate composite structure ( a=9.5964(1) Å, c=2.6001(1) Å, q =0.66159(3) c ∗ , superspace group R 3 ̄ m(00γ)0s) consists of the modulated [(Mn,Cu)O 3] ∞ and [Sr] ∞ subsystems. The repeat period along the [(Mn,Cu)O 3] ∞ chains of the BO 6 octahedra and the A′O 6 trigonal prisms is equal to 99 polyhedra and can be represented as a sequence of 1×(3 oct+1 prism) and 9×(2 oct+1 prism) or 10×(2 oct+1 prism) . Mn is located at the octahedral sites, whereas the trigonal prismatic sites are randomly occupied by Mn and Cu.
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