Journal
PHYSICA B-CONDENSED MATTER
Volume 371, Issue 2, Pages 337-342Publisher
ELSEVIER
DOI: 10.1016/j.physb.2005.10.131
Keywords
donor doping; space-charge polarisation; DC conductivity; dielectric loss
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In this paper, structural and electrical studies of A-site lanthanum-substituted Sr1-xLaxBi2Nb2O9; x = 0.0-0.5 ceramics are reported. The introduction of lanthanum produces pore-free microstructure upto x = 0.3. A diffuse ferroelectric to paraelectric phase transition is observed in the doped samples and positive temperature coefficient of resistance (PTCR) is observed in x = 0.0. 0.4 and 0.5 samples whereas x = 0.1-0.3 samples show negative temperature coefficient of resistance (NTCR). Curie temperature decreases continuously with increase in lanthanum content. (c) 2005 Elsevier B.V. All rights reserved.
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