Title :
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
Abstract :
The dielectric and piezoelectric properties of Pb1-3/2xLaxTiO3 (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; Pb1-3/2xLaxTiO3 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;
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
DOI :
10.1109/KORUS.1999.876217
