Electric Properties of La3+ Doped BaTiO3 Ceramics

• Published in: Ferroelectrics 2011-01, Vol.418 (1), p.150-157
• Main Authors: Wodecka-Duś, B., Czekaj, D.
• Format: Article
• Language: English
• Subjects: BLT; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Conductivity of specific materials; Dielectric properties of solids and liquids; Dielectrics, piezoelectrics, and ferroelectrics and their properties; donor-doping; electroceramics; Electronic transport in condensed matter; Exact sciences and technology; impedance spectroscopy; Insulators; Permittivity (dielectric function); Physics; piezoresistivity
• ISSN: 0015-0193; 1563-5112
• DOI: 10.1080/00150193.2011.578988

Barium titanate ceramic BaTiO 3 (BT) has been investigated extensively because of scientific interest as well as various applications to electronic devices. When pure BaTiO 3 is highly resistive at room temperature (ρ > 10 10 Ωcm). However its electrical resistivity can be dramatically lowered by some dopants, like rare earth elements [ 1 , 2 ]. In the present research lanthanum-doped BT ceramics described by the general formula Ba 1-x La x Ti 1-x/4 O 3 , for x = 0.001 and x = 0.003, was prepared by free sintering method. The electrical properties of (BLT) materials were studied by impedance spectroscopy with a Quadtech 1920-type precision LCR meter and parameters of the phase transition were determined. The equivalent circuit method was applied to fit the experimental data. The possibility of application of La-doped BT ceramics for fabrication of piezoresistive transducers sensitive for small stress load are also discussed in the present paper.