Abstract
Aurivillius 's phases exhibit original [Bi 2O 2] n layers; up to now such phases exist only with bismuth. The aim of this paper is to report new related phase, containing only antimony, which is promissing because its ferroelastic properties. Synthesis, crystal growth and structure determination of the original double oxide Sb 2WO 6 has been performed. It crystallizes in the triclinic system, space group P1, with a=5.554(1), b=4.941(2), c=9.209(3) A ̊ , α=90.05(3), β=96.98(2), γ=90.20(2)°, V=250.8(7) A ̊ 3 . TEM and optical microscopy investigations allow to evidence a ferroelastic behaviour at room temperature with a phase transition in the range 300–400°C. The crystal structure of Sb 2WO 6 is built up by [WO 4] n layers of WO 6 octahedra sharing corners sandwiched by two [Sb 2O 2] n layers; it can be described as [WO 2Sb 2O 4] n thick layers held together by weak Sb...O interactions. The antimony atoms exhibit typical 3+1 one sided coordination. Via structural relationships with Sb 2O 3, VOSb 2O 4 and Bi 2WO 6, Sb 2WO 6 is related with the Aurivillius phases announcing how [Bi 2O 2] n layers with the shape encountered in red PbO can be formed or distorted.
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