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Structure of the Paraelectric Phase at 923 K. -The ferroelectric phase transition of the title compound occurring at 890 K is characterized by high-temperature powder XRD, electron diffraction, HREM, second-harmonic generation, DSC, and dielectric and electrical conductivity measurements. The phase transition from a polar ferroelectric form (space group R3c) to a centrosymmetric paraelectric form (space group R3c) is reversible and of first order. The structural parameters of the paraelectric phase are refined by the Rietveld method from XRD data at 923 K in the space group R3c with Z = 6. -(LAZORYAK, B. I.; MOROZOV, V. A.; BELIK, A. A.; STEFANOVICH, S. Y.; GREBENEV, V. V.; LEONIDOV, I. A.; MITBERG, E. B.; DAVYDOV, S. A.; LEBEDEV*, O. I.; VAN TENDELOO, G.; Solid State Sci. 6 (2004) 2, 185-195; EMAT, Univ. Antwerp, B-2020 Antwerpen, Belg.; Eng.) -W. Pewestorf 43-005

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