Title :
Electromechanical properties of fine-grain, 0.7 Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-0.3PbTiO/sub 3/ ceramics
Author :
Wang, Haifeng ; Jiang, Bei ; Shrout, Thomas R. ; Cao, Wenwu
Author_Institution :
Mater. Res. Inst., Pennsylvania State Univ., University Park, PA, USA
fDate :
7/1/2004 12:00:00 AM
Abstract :
A fine grain, relaxor-based piezoelectric ceramic 0.7 Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-0.3PbTiO/sub 3/ (PMN-30% PT) has been investigated, which was fabricated using the columbite precursor method. The complete set of electromechanical properties of the piezoceramic at room temperature is determined using a combination of ultrasonic and resonance techniques. This fine-grain ceramic (grain size /spl les/ 2.5 /spl mu/m) exhibits ultra-high dielectric permittivity (/spl epsi//sub 33//sup T/ //spl epsi//sub 0/ /spl sim/ 7000) and a high coupling coefficient k/sub 33/ (= 0.78). Ultrasonic spectroscopy was used to measure the dispersion of the phase velocity and attenuation for the longitudinal wave propagating in the poling direction. Lower attenuation and smaller velocity dispersion were observed compared to modified Pb(Zr/sub x/Ti/sub 1-x/)O/sub 3/ (PZT-5H) ceramics. The measurement results show that this fine-grain PMN-30% PT ceramic is a very good material for making ultrasonic array transducers.
Keywords :
dielectric polarisation; elastic constants; grain size; lead compounds; permittivity; piezoceramics; piezoelectricity; relaxor ferroelectrics; ultrasonic absorption; ultrasonic dispersion; ultrasonic propagation; ultrasonic velocity; 293 to 298 K; PbMg/sub 0.3/O/sub 3/Nb/sub 0.6/O/sub 3/-PbTiO/sub 3/; columbite precursor method; coupling coefficient; dielectric permittivity; electromechanical properties; grain size; longitudinal wave propagation attenuation; phase velocity dispersion; poling direction; relaxor-based piezoelectric ceramics; resonance method; room temperature; ultrasonic array transducers application; ultrasonic method; ultrasonic spectroscopy; Attenuation; Ceramics; Dielectrics; Grain size; Niobium; Piezoelectric materials; Resonance; Temperature; Ultrasonic transducer arrays; Ultrasonic variables measurement;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2004.1320751
