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Dielectric relaxation and microwave loss in the La(Mg1/2Ti1/2)O3–(Na1/2Bi1/2)TiO3 perovskite ceramics

Published online by Cambridge University Press:  31 January 2011

A.N. Salak ,
V.M. Ferreira ,
L.G. Vieira ,
J.L. Ribeiro ,
R.C. Pullar  and
N.McN. Alford
A.N. Salak*
Affiliation:
Department of Ceramics and Glass Engineering / Center for Research in Ceramics and Composite Materials (CICECO), University of Aveiro, 3810-193 Aveiro, Portugal
V.M. Ferreira
Affiliation:
Department of Civil Engineering / Center for Research in Ceramics and Composite Materials (CICECO), University of Aveiro, 3810-193 Aveiro, Portugal
L.G. Vieira
Affiliation:
Department of Physics, University of Minho, 4710-057 Braga, Portugal
J.L. Ribeiro
Affiliation:
Department of Physics, University of Minho, 4710-057 Braga, Portugal
R.C. Pullar
Affiliation:
Centre for Physical Electronics and Materials, Faculty of Engineering, Science and the Built Environment, London South Bank University, London SE1 0AA, United Kingdom
N.McN. Alford
Affiliation:
Centre for Physical Electronics and Materials, Faculty of Engineering, Science and the Built Environment, London South Bank University, London SE1 0AA, United Kingdom
*
a)Address all correspondence to this author. e-mail: salak@cv.ua.pt
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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.

Keywords

MicrostructureDielectric propertiesInfrared (IR) spectroscopy
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 10 , October 2007 , pp. 2676 - 2684
Copyright
Copyright © Materials Research Society 2007

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