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Dielectric and structural properties of A-cation-deficient perovskites, tetragonal tungsten bronzes and their composites in the K2Sr4(Mgx Nb10-x) Li3xO30 system

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Abstract

In the K2Sr4(MgxNb10-x) Li3xO30 system (0≤x≤1.33), two phases, one having a tetragonal tungsten bronze (TTB) structure and the other having a perovskite-type structure, are observed after calcination and sintering. The synthesis of single-phase samples, having either of these structure types, has allowed for the determination of their respective contribution to the system's dielectric properties, specifically ε′r=f (T ) and tgδ=f (T) over the temperature range −60 to 150 °C. Using X-ray and electron diffraction techniques, scanning electron microscope observations and energy dispersive spectroscopy analysis, various A-cation-deficient perovskite phases were characterized, in particular Sr0.8(Mg0.2Nb0.8)O3. The compositional ability of the TTB structure in this system is also correlated to the ε′r=f (T ) curves, which exhibit a broad maximum. © 1998 Kluwer Academic Publishers

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Authors and Affiliations

  1. Laboratoire CRISMAT/ISMRA, (CNRS-UMR 6508), 6 bd Maréchal Juin, 14050, CAEN Cedex, France

    B. Tribotte, M. Hervieu & G. Desgardin

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  1. B. Tribotte
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  2. M. Hervieu
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  3. G. Desgardin
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Tribotte, B., Hervieu, M. & Desgardin, G. Dielectric and structural properties of A-cation-deficient perovskites, tetragonal tungsten bronzes and their composites in the K2Sr4(Mgx Nb10-x) Li3xO30 system. Journal of Materials Science 33, 4609–4620 (1998). https://doi.org/10.1023/A:1004485208774

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