Structure and microwave dielectric properties of La(Mg0.5Ti0.5)O-3-CaTiO3 system


(1-x)La(Mg0.5Ti0.5)O-3 (LMT)-xCaTiO(3) (CT) [0 < x < 1] ceramics were prepared from powder obtained by a nonconventional chemical route based on the Pechini method. The crystal structure of the microwave dielectric ceramics has been refined by Rietveld method using X-ray powder diffraction data. LMT and CT were found to form a solid solution over the whole compositional range. The 0.9LMT-0.1CT composition was refined using P2(1)/n space group, which allows taking into account B-site ordering. The compounds having xgreater than or equal to0.3 were found to be disordered and were refined using Pbnm space group. Microstructure evolution was also analysed. Dielectric characterization at microwave frequencies was performed on the LMT-CT ceramics. The permittivity and the temperature coefficient of resonant frequency of the solid solutions showed a non-linear variation with composition. The quality factor demonstrates a considerable decrease with the increase of CT content. (C) 2003 Elsevier Ltd. All rights reserved.




Materials Science


Seabra, MP; Avdeev, M; Ferreira, VM; Pullar, RC; Alford, NM

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