Dielectric relaxation anal microwave loss in the La(Mg1/2Ti1/2)O-3-(Na1/2Bi1/2)TiO3 perovskite ceramics

resumo

Dielectric response of the perovskite ceramics (1-x)La(Mg1/2Ti1/2)O3-x(Na1/2Bi1/2)TiO3 [(1-x)LMT-xNBT] (0 <= x <= 0.6) has been characterized at radio, microwave, and far infrared frequency ranges. Temperature variations of the dielectric permittivity and loss estimated by different methods were compared and analyzed. It was revealed that the low temperature dielectric response of the compositions with x >= 0.2 is frequency-dependent over a wide range (10(2)-10(9) Hz) below the resonant frequencies of the polar phonon modes. Contributions of different factors (both extrinsic and intrinsic) to the microwave dielectric loss of the ceramics were considered. The dielectric relaxation has been associated with the amount of bismuth in the system. The relaxation in LMT-NBT was considered in the context of similar effects observed in other Bi-containing, A-site disordered oxygen-octahedral compositions.

palavras-chave

BI2O3-ZNO-NB2O5 CUBIC PYROCHLORE; FERROELECTRIC RELAXOR; NA0.5BI0.5TIO3; FREQUENCY

categoria

Materials Science

autores

Salak, AN; Ferreira, VM; Vieira, LG; Ribeiro, JL; Pullar, RC; Alford, NM

nossos autores

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