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Crystal Structure of Dielectric Ceramics in the La(Mg0.5Ti0.5)O3–BaTiO3 System

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Abstract

The crystal structure of microwave dielectric ceramics in the (1 − x)La(Mg0.5Ti0.5)O3 (LMT)–xBaTiO3 (BT) (0 ≤ x ≤ 0.9) system has been refined by Rietveld method using x-ray powder diffraction data. LMT and BT were found to form a solid solution in the whole compositional range. The increase of BaTiO3 content results in the following sequence of structure transformations of those solid solutions: P21/n (a−a−c+, B-site ordered) → Pbnm (a−a−c+) → I4/mcm (a0a0c−) → Pm3m (a0a0a0). These structural changes are related to the disappearance of B-site cation ordering (x > 0.1), in-phase tilting (x > 0.3), and antiphase tilting (x > 0.5), respectively.

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Authors and Affiliations

  1. Department of Ceramic and Glass Engineering/UIMC, University of Aveiro, 3810-193, Aveiro, Portugal

    M. Avdeev, M. P. Seabra & V. M. Ferreira

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  1. M. Avdeev
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  2. M. P. Seabra
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  3. V. M. Ferreira
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Avdeev, M., Seabra, M.P. & Ferreira, V.M. Crystal Structure of Dielectric Ceramics in the La(Mg0.5Ti0.5)O3–BaTiO3 System. Journal of Materials Research 17, 1112–1117 (2002). https://doi.org/10.1557/JMR.2002.0164

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  • DOI: https://doi.org/10.1557/JMR.2002.0164

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