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New Gadolinium Based Ferroelectric Phases Derived from the Tetragonal Tungsten Bronze (TTB)

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Substitution of Pb with Gd in the Pb2KNb5O15 phases leads to a new composition of solid solution with chemical composition Pb2(1 − x)GdxK1 + xNb5O15 (0 ≤ x ≤ 1) which crystallizes with TTB type structure. Powders are pressed and heated into ceramics and their compaction is about 90%. Thermal evolution of the real part of the dielectric permittivity presents different behavior according to the composition. The dielectric permittivity of compounds with Gd composition above x = 0.30 shows two anomalies. The first one appears at TC and is associated to the ferroelectric-paraelectric phase transition. The origin of the last one at which occurs at T1 is up to now unknown. Domain structure should exhibit strong changes both with temperature and composition.
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Keywords: Niobate; domains; ferroelectric; phase transition; solid solution

Document Type: Research Article

Affiliations: 1: Faculty of Sciences, University Cadi Ayyad, Laboratory of Mineral Solid State Chemistry, Bd. My Abdallah, B.P. 2390, Marrakech (Morocco) 2: Faculty of Sciences and Technics, University Cadi Ayyad, B.P. 549, Marrakech (Morocco) 3: University of Toulon and Var, L2MP(UMR CNRS 6137), 83957 La Garde, France

Publication date: January 1, 2003

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