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3 . -The title phase is synthesized from stoichiometric mixtures of Bi2O3, MgO, and TiO2 (5-6 GPa, 1270-1370 K) and characterized by powder XRD, EDX, and SEM. The compound crystallizes in the orthorhombic space group Pnnm with Z = 8 and exhibits a superstructure associated with both the antiferroelectric-like displacements of Bi 3+ cations and the antiphase tilting of oxygen octahedra. A relation of the crystal structure of the title phase to that commonly accepted for antiferroelectric perovskite PbZrO3 is discussed. -(KHALYAVIN*, D. D.; SALAK, A. N.; VYSHATKO, N. P.; LOPES, A. B.; OLEKHNOVICH, N. M.; PUSHKAREV, A. V.; MAROZ, I. I.; RADYUSH, Y. V.; Chem. Mater. 18 (2006) 21, 5104-5110; Dep. Ceram. Glass Eng., Univ. Aveiro, P-3810 Aveiro, Port.; Eng.) -W. Pewestorf 02-020

The starting ternary compounds CuInS 2 and CuSbS 2 and alloys of the CuSbS 2 -CuInS 2 system with the molar fractions of CuInS 2 (x) equal to 0. 05, 0.15, 0.25, 0.375, 0.50, 0.625, 0.75, 0.85, and 0.95 were prepared and the phase relations in this system were investigated by X-ray powder diffraction, optical microscopy, scanning electron microscopy, and differential thermal analysis. It was shown that the T-x phase diagram of the CuInS 2 -CuSbS 2 system has a eutectic character with the eutectic temperature of 807 K. The alloys of the CuSbS 2 -CuInS 2 system with the molar fraction of CuInS 2 in the range from 0.038 to 0.941 at room temperature are two-phased, and the limits of solubility are 0.059 molar fractions for CuSbS 2 in CuInS 2 and 0.038 molar fractions for CuInS 2 in CuSbS 2 .

Alloys of the (CuBiSe2)1–x(CuInSe2)x system with molar part of CuInSe2 (x) equal to 0.05, 0.15, 0.25, 0.375, 0.50, 0.625, 0.75, 0.85, and 0.95 were prepared and the phase relations in this system above 600 K were investigated by using of X‐ray powder diffraction, microstructure studies, and differential thermal analysis. It was established, that the T–x phase diagram of the CuInSe2–CuBiSe2 system has a peritectic character with the peritectics temperature of 837 K. The limits of solubility from both sides of the system do not exceed 0.05 molar parts of the corresponding ternary compound. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)