Abstract
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 (102–109 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.
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Acknowledgments
The first author acknowledges the Foundation for Science and Technology (FCT-Portugal, Grant SFRH/BPD/14988/2004). This work was also supported in part by the Treaty of Windsor (Anglo-Portuguese) Programme (Action B-24/06).
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Salak, A.N., Ferreira, V.M., Vieira, L.G. et al. Dielectric relaxation and microwave loss in the La(Mg1/2Ti1/2)O3–(Na1/2Bi1/2)TiO3 perovskite ceramics. Journal of Materials Research 22, 2676–2684 (2007). https://doi.org/10.1557/JMR.2007.0365
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DOI: https://doi.org/10.1557/JMR.2007.0365