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Temperature dependence of the piezoelectric shear coefficient of PMN-PT, LiNbO3 and PZT transducers Open Access


Other title
Piezoelectricity at cryogenic temperatures
Temperature dependence of d15
Measuring d15 at cryogenic temperatures
PZT, PMN-PT, LiNbO3 transducers
Piezoelectic coefficient
Temperature dependence of piezoelectric
Type of item
Degree grantor
University of Alberta
Author or creator
Bukhari, Syed Asad Manzoor
Supervisor and department
Condense Matter Physics
Examining committee member and department
Marsiglio, Frank (Physics)
Davis, John (Physics)
Beamish, John (Physics)
Freeman, Mark (Physics)
Department of Physics

Date accepted
Graduation date
Master of Science
Degree level
Piezoelectric transducers are widely used as sensitive detectors of stress and to generate nanometer scale displacements. However, their piezoelectric coefficients often decrease substantially at cryogenic temperatures, limiting their performance in, e.g., low temperature STMs (scanning tunneling microscopes), biomedical imaging and space applications. It’s important these days to understand the behavior of sensors and actuators at low temperatures because of their use at these temperatures. We have recently used PZT (lead zirconate titanate) shear transducers to measure the elastic modulus of solid 4He at very low strains and to plastically deform the helium at high strains. From our elastic measurements, we inferred a shear piezoelectric coefficient d15 = 1.0× 10^(-10) m/V below 1 K. This is about 6 times smaller than the room temperature value for PZT and comparable to d15 for single crystal LiNbO3 transducers (7.0×10^(-11) m/V). We have now developed a capacitive technique and have directly measured the temperature dependence of d15 for ceramic (PZT) and single crystal LiNbO3 and PMN-PT (lead magnesium niobium-lead titanate) shear transducers. PMN-PT has an extremely large d15 at room temperature (4.0×10^(-9) m/V) but it decreases rapidly below 100K. LiNbO3 has the smallest room temperature d15, but it is nearly temperature independent. At 4 K, these three types of transducers d15 have similar piezoelectric shear coefficients.
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