Journal
MATERIALS CHARACTERIZATION
Volume 62, Issue 10, Pages 1000-1006Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2011.07.013
Keywords
Barium titanate; Dopant; Soft chemical synthesis; Microstructure; Electrical properties
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Funding
- Ministry of Science and Technological Development Republic of Serbia [111 45021]
- Lithuanian Research Funding Institution-Faculty of Physics, Vilnius and COST [539]
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Pure and lanthanum doped barium titanate (BT) ceramics were prepared by sintering pellets at 1300 degrees C for 8 h, obtained from nanopowders synthesized by the polymeric precursor method. XRD results showed formation of a tetragonal structure. The presence of dopants changed the tetragonal structure to pseudo-cubic. The polygonal grain size was reduced up to 300 nm with addition of lanthanum as a donor dopant. Determined dielectric properties revealed that lanthanum modified BT ceramics possessed a diffused ferroelectric character in comparison with pure BT that is a classical ferroelectric material. In doped BT phase transition temperatures were shifted to lower temperatures and dielectric constant values were much higher than in pure BT. A modified Currie Weiss law was used to explore the connection between the doping level and degree of diffuseness of phase transitions. Impedance spectroscopy measurements were carried out at different temperatures in order to investigate electrical resistivity of materials and appearance of a PTCR effect. (C) 2011 Elsevier Inc. All rights reserved.
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