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Synthesis and Properties of Nickel-Containing Niobates.-Phase equilibria in the systems NiO-Nb 2 O 5 (A) and SrCO 3 -NiO-Nb 2 O 5 (B) are studied by means of complex physico-chemical methods. The formation of Ni 4 Nb 2 O 9 in system (A) is found. This high-temperature modification of nickel niobate crystallizes in the rhombic system. Solid solutions (Sr 1−x Nix) 4 Nb 2 O 9 (0 ≤ x ≤ 0.25) and (Sr 1−x Nix) 6 Nb 2 O 11 (x = 0.17) are formed in the ternary system (B). -(PODKORYTOV, A. L.; PANTYUKHINA, M. I.; SHTIN, S. A.; ZHUKOVSKII, V. M.; Zh. Neorg. Khim. 44 (1999) 5, 855-858; Ural. gos. univ. im. Gor'kogo, Ekaterinburg 620083, Russia; RU)

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Synthesis and Properties of (Sr 1−x Mx) 2 Nb 2 O 7 (M: Cu, Ni) Solid Solutions. -The title solid solutions are obtained by solid state reaction of SrCO 3 , NiO, and Nb 2 O 3 (700-1200 • C). They possess a layered perovskite-type structure and display a mixed electronic-ionic character of conductivity. Phase equilibria relations and kinetic regularities of formation of the solid solutions are studied. -(PODKORYTOV, A. L.; PANTYUKHINA, M. I.; SHTIN, S. A.; ZHUKOVSKII, V. M. ; Neorg. Mater. 36 (2000) 12, 1516-1518 Ural. gos. univ. im. Gor'kogo, Ekaterinburg 620083, Russia; RU)

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