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- W2124518785 abstract "Abstract A series of Sr n (Nb, Ti) n O3n+2 structures with n = 4, 4.5, 5, 6 and 7 were studied by transmission electron microscopy. These structures are composed of infinite two-dimensional slabs of the distorted perovskite structure that are n (Ti, Nb)O6 octahedra thick and extend parallel to the {110}perrovskite plane. The slabs are displaced with respect to each other by the translation vector ½[011]perovskite. All members of the Sr n (Nb, Ti) n O3n+2 series have an orthorhombic basic lattice with a ≈ a perovskite and c ≈ 2 1/2 a perovskite, while the long b axis increases systematically with increasing n value. The compounds with n = 4, 5, 6 and 7 were observed to undergo a commensurate ← incommensurate phase transition on cooling in the temperature range 150–250°C. The wave-vector of the incommensurate modulation is parallel to [100] direction of the basic orthorhombic lattice and is close but not exactly equal to ½a∗. The n = 5 incommensurate phase further transformed at 180°C to a monoclinic structure with the space group P1121/b (No. 14). For the n = 4. 6 and 7 compounds, no lock-in transition was observed down to −170°C. For the compound with n = 4.5, the transition from orthorhombic to monoclinic structure P1121/b occurred on cooling at 390°C. All transitions observed in the Sr n (Nb, Ti) n O3n+2 compounds were attributed to tilting of the (Ti, Nb)O6 octahedra." @default.
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- W2124518785 date "2000-02-01" @default.
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- W2124518785 title "A structural study of the layered perovskite-derived Sr<sub><i>n</i></sub>(Ti, Nb)<sub><i>n</i></sub>O<sub>3<i>n</i></sub>+2 compounds by transmission electron microscopy" @default.
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- W2124518785 doi "https://doi.org/10.1080/01418610008212060" @default.
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