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Polymorphism and properties of Bi2W1 − x Mo x O6 aurivillius phases

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Abstract

A continuous series of Bi2W1 − x Mo x O6 solid solutions between the n = 1 Aurivillius phases Bi2WO6 and Bi2MoO6 with a polar orthorhombic structure (γ-phase) have been prepared by solid-state reactions at 850 (0 < x ≤ 0.3) and 530–640°C (0.3 ≤ x < 1), and their thermal and electrical properties have been studied throughout their stability region, between room temperature and 960°C, with the aim of gaining detailed insight into their polymorphism. The results demonstrate that the tungsten-rich (0 ≤ x ≤ 0.2) materials undergo a ferroelectric and a reconstructive phase transition like bismuth tungstate, Bi2WO6. The temperatures of both transitions decrease with increasing molybdenum content. The molybdenum-rich materials in the composition range 0.9 ≤ x ≤ 1 are similar in properties to bismuth molybdate, Bi2MoO6. In the composition range 0.3 ≤ x ≤ 0.8, neither ferroelectric nor reconstructive phase transition was detected.

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Authors and Affiliations

  1. Faculty of Physics, Moscow State University, Moscow, 119991, Russia

    V. I. Voronkova, E. P. Kharitonova & O. G. Rudnitskaya

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  1. V. I. Voronkova
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  2. E. P. Kharitonova
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  3. O. G. Rudnitskaya
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Correspondence to V. I. Voronkova.

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Original Russian Text © V.I. Voronkova, E.P. Kharitonova, O.G. Rudnitskaya, 2011, published in Neorganicheskie Materialy, 2011, Vol. 47, No. 2, pp. 226–234.

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Voronkova, V.I., Kharitonova, E.P. & Rudnitskaya, O.G. Polymorphism and properties of Bi2W1 − x Mo x O6 aurivillius phases. Inorg Mater 47, 183–191 (2011). https://doi.org/10.1134/S0020168511010146

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