Dielectric characterization of the (1-x)La(Mg1/2Ti1/2)O-3-xBaTiO(3) microwave ceramics


The dielectric properties of the perovskite mixed system La(Mg1/2Ti1/2)O-3-BaTiO3 were studied at radio, microwave and far infrared frequency ranges in respect of potential microwave application. The room temperature values of relative permittivity, dielectric loss and temperature coefficient of the resonant frequency were estimated by different methods. The permittivity and the thermo-stability coefficient were found to follow a simple hyperbolic-type dependence on composition. The dielectric response of air- and oxygen-sintered ceramics was compared and analysed. The origin of the dielectric loss and frequency dispersion in BaTiO3-rich compositions of the system is discussed.



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Salak, AN; Seabra, MP; Ferreira, VM; Ribeiro, JL; Vieira, LG

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