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

Published online by Cambridge University Press:  31 January 2011

M. Avdeev ,
M. P. Seabra  and
V. M. Ferreira
M. Avdeev
Affiliation:
Department of Ceramic and Glass Engineering/UIMC, University of Aveiro, 3810–193 Aveiro, Portugal
M. P. Seabra
Affiliation:
Department of Ceramic and Glass Engineering/UIMC, University of Aveiro, 3810–193 Aveiro, Portugal
V. M. Ferreira
Affiliation:
Department of Ceramic and Glass Engineering/UIMC, University of Aveiro, 3810–193 Aveiro, Portugal
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Extract

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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Articles
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Journal of Materials Research , Volume 17 , Issue 5 , May 2002 , pp. 1112 - 1117
Copyright
Copyright © Materials Research Society 2002

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