Title :
Increased operating temperature range in La-modified Pb(Mg1/3 Nb2/3)O3-PbTiO3 relaxor ferroelectric-based transducers
Author :
Fielding, J.T., Jr. ; Shrout, T.R. ; Jang, S.J.
Author_Institution :
Mater. Res. Lab., Pennsylvania State Univ., University Park, PA, USA
Abstract :
The large E-field induced strains and electromechanical coupling in PMN-based relaxors have been utilized in actuator and transducer applications. The effect of La3+ modifications on the field-dependent dielectric and piezoelectric properties was investigated for several (1-x)PMN-(x)PT compositions with transition regions near room temperature. The effect of La3+ modifications, increasing the width of the micro-macro polar transition range (ΔT), defined as the difference between the temperature of maximum permittivity (Tmax) and the depolarization temperature (Td), results in a broader temperature range for obtaining large induced electromechanical coupling factors with negligible hysteresis
Keywords :
dielectric hysteresis; dielectric relaxation; electric field effects; ferroelectric devices; ferroelectric materials; ferroelectric transitions; lanthanum compounds; lead compounds; permittivity; piezoelectric materials; piezoelectric transducers; La-modified Pb(Mg13/Nb23/)O3-PbTiO3 relaxor ferroelectric-based transducers; PMN-based relaxors; PMN:La-PbTiO3; PbMgO3NbO3:La-PbTiO3; actuator; depolarization temperature; dielectric properties; electromechanical coupling; increased operating temperature range; large E-field induced strains; maximum permittivity; micro-macro polar transition range width; negligible hysteresis; piezoelectric properties; transition regions; Dielectric constant; Dielectric losses; Dielectric measurements; Impedance; Niobium; Performance evaluation; Polarization; Pyroelectricity; Temperature distribution; Temperature measurement;
Conference_Titel :
Applications of Ferroelectrics, 1994.ISAF '94., Proceedings of the Ninth IEEE International Symposium on
Conference_Location :
University Park, PA
Print_ISBN :
0-7803-1847-1
DOI :
10.1109/ISAF.1994.522324
