Dielectric and piezoelectric properties of La-modified lead titanate ceramics

Author

Lee, J.S. ; Kim, M.S. ; An, B.G. ; Mun, N.C. ; Park, S.J. ; Yang, S.S.

Author_Institution

Ulsan Univ., South Korea

Volume

2

fYear

1999

fDate

1999

Firstpage

523

Abstract

The dielectric and piezoelectric properties of Pb_1-3/2xLa_xTiO₃ (PLT) ceramics, with varying the composition in the range of x=0.05~0.25, have been investigated. The substitution of La atoms into Pb-site was found to enhance the grain growth and densification of PLT ceramics. With increasing x, the lattice anisotropy (c/a) was decreased, resulting in a lowering of the Curie point. Energy-trapped thickness vibration mode resonators with dimension of 6×4×0.3 mm showed better characteristics in the 3rd harmonic resonance at around 25 MHz than in the fundamental resonance at around 8 MHz. Their piezoelectric coupling coefficients at the 3rd resonance were about 10%, and the electromechanical quality factor reached 3500 when x=0.15

Keywords

Q-factor; crystal resonators; densification; ferroelectric Curie temperature; grain growth; lanthanum compounds; lead compounds; permittivity; piezoceramics; powder technology; sintering; (PbLa)TiO₃; Curie point lowering; La substitution effect; Pb_1-3/2xLa_xTiO₃ ceramics; densification; dielectric properties; electromechanical quality factor; energy-trapped thickness vibration mode resonator; fundamental resonance; grain growth; impedance characteristics; lattice anisotropy; permittivity; piezoelectric coupling coefficients; piezoelectric properties; temperature dependence; third harmonic resonance; Anisotropic magnetoresistance; Ceramics; Dielectrics; Frequency; Lattices; Lead; Powders; Resonance; Titanium compounds; Vibrations;

fLanguage

English

Publisher

ieee

Conference_Titel

Science and Technology, 1999. KORUS '99. Proceedings. The Third Russian-Korean International Symposium on

Conference_Location

Novosibirsk

Print_ISBN

0-7803-5729-9

Type

conf

DOI

10.1109/KORUS.1999.876217

Filename

876217