Increased operating temperature range in La-modified Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/ relaxor ferroelectric-based transducers

The large E-field induced strains and electromechanical coupling in PMN-based relaxors have been utilized in actuator and transducer applications. The effect of La/sup 3+/ modifications on the field-dependent dielectric and piezoelectric properties was investigated for several (1-x)PMN-(x)PT composi...

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Bibliographic Details
Main Authors: Fielding, J.T., Shrout, T.R., Jang, S.J.
Format: Conference Proceeding
Language:English
Subjects:
Dielectric constant
Dielectric losses
Dielectric measurements
Impedance
Niobium
Performance evaluation
Polarization
Pyroelectricity
Temperature distribution
Temperature measurement
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Summary:The large E-field induced strains and electromechanical coupling in PMN-based relaxors have been utilized in actuator and transducer applications. The effect of La/sup 3+/ 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 La/sup 3+/ modifications, increasing the width of the micro-macro polar transition range (/spl Delta/T), defined as the difference between the temperature of maximum permittivity (T/sub max/) and the depolarization temperature (T/sub d/), results in a broader temperature range for obtaining large induced electromechanical coupling factors with negligible hysteresis.
DOI:10.1109/ISAF.1994.522324