Dielectric relaxation anal microwave loss in the La(Mg1/2Ti1/2)O-3-(Na1/2Bi1/2)TiO3 perovskite ceramics
authors Salak, AN; Ferreira, VM; Vieira, LG; Ribeiro, JL; Pullar, RC; Alford, NM
nationality International
journal JOURNAL OF MATERIALS RESEARCH
keywords BI2O3-ZNO-NB2O5 CUBIC PYROCHLORE; FERROELECTRIC RELAXOR; NA0.5BI0.5TIO3; FREQUENCY
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 (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.
publisher CAMBRIDGE UNIV PRESS
issn 0884-2914
year published 2007
volume 22
issue 10
beginning page 2676
ending page 2684
digital object identifier (doi) 10.1557/JMR.2007.0365
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000250033800007
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journal impact factor 1.495
5 year journal impact factor 1.716
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