Structural and electrical studies in La-substituted SrBi2Nb2O9 ferroelectric ceramics (original) (raw)

Abstract

In this paper, structural and electrical studies of A-site lanthanum-substituted Sr 1Àx La x Bi 2 Nb 2 O 9 ; x ¼ 0:020:5 ceramics are reported. The introduction of lanthanum produces pore-free microstructure upto x ¼ 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 ¼ 0:0, 0.4 and 0.5 samples whereas x ¼ 0:120:3 samples show negative temperature coefficient of resistance (NTCR). Curie temperature decreases continuously with increase in lanthanum content.

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