期刊
PHYSICA B-CONDENSED MATTER
卷 406, 期 13, 页码 2669-2677出版社
ELSEVIER
DOI: 10.1016/j.physb.2011.03.081
关键词
Solid state reaction; Electron microscopy; Dielectric properties; Electrical conductivity; Impedance
Bismuth ferrite (BFO) and La-substituted BFO with composition Bi1-xLaxFeO3 (x=0.05, 0.1 and 0.15) (BLFOx-0.05-0.15) ceramics were prepared using the solid state reaction route. A structural phase transition from rhombohedral phase to triclinic phase was observed for BLFOx=0.05-0.15 ceramics. Modulus spectroscopy reveals the deviation of dielectric behavior from ideal Debye characteristics and the dependence of conductivity on ion hopping in BFO and BLFOx=0.05-0.15 ceramics. The conductivity of the BFO ceramics decreases for La content of 5 mol%, followed by a subsequent increase with 10 and 15 mol% of lanthanum doping. The typical values of the activation energies at high temperature reveal the contribution of short range movement of doubly ionized oxygen vacancies to the conduction process in BFO and BLFOx=0.05 ceramics. Both short range and long range motion of oxygen vacancies are responsible for large conductivity in BLFOx=0.1 (and 0.15) ceramics. (C) 2011 Elsevier B.V. All rights reserved.
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