Crystal structure of dielectric ceramics in the La(Mg0.5Ti0.5)O3–BaTiO3 system
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Date
2011-01-31
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Cambridge University Press
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. © Materials Research Society 2002
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Keywords
Crystal structure, Dielectric materials, X-ray diffraction, Ceramics, Phase transformations, Cations
Citation
Avdeev, M., Seabra, M., & Ferreira, V. (2002). Crystal structure of dielectric ceramics in the La(Mg0.5Ti0.5)O3–BaTiO3 system. Journal of Materials Research, 17(5), 1112-1117. doi:10.1557/JMR.2002.0164