Title :
Investigation of the dielectric and piezoelectric properties of PMN and PMN-PT materials for ultrasonic transducer applications
Author :
Brown, L.F. ; Carlson, R.L. ; Sempsrott, J.M. ; Stranford, G.T. ; Fitzgerald, J.J.
Author_Institution :
Dept. of Electr. Eng., South Dakota State Univ., Brookings, SD, USA
Abstract :
The dielectric and piezoelectric properties of lead magnesium niobate, Pb(Mg1/3Nb2/3)O3 (PMN), and the solid solution systems with lead titanate, PbTiO3 (PT), are of importance for investigating the viability of these relaxor ferroelectric materials for sensor/actuator applications. Fundamental investigations of the relationship between the synthesis and processing, atomic-level chemical structure, and the electrical properties of PMN and PMN/PT have been initiated. This presentation summarizes the results of recent investigations of the dielectric and piezoelectric properties of (1-x)PMN-xPT across a compositional range which includes the morphotropic phase boundary (0⩽x⩽0.5). Measurements include the dielectric constant (K), dielectric loss tangent (tanδe), thickness-mode piezoelectric strain constant (d33), longitudinal sound velocity (v1), mechanical quality factor (Qm), and the thickness-mode electromechanical coupling factor (kt) as functions of both frequency and temperature. These results are being used with various spectroscopic studies including powder XRD, solid state NMR and EPR spectroscopy, to further investigate the atomic level information of PMN and PMN-PT. The viability of these materials for electrostrictive ultrasonic transducers is being further investigated
Keywords :
Q-factor; X-ray diffraction; dielectric losses; electrostriction; ferroelectric materials; ferroelectric transitions; lead compounds; nuclear magnetic resonance; paramagnetic resonance; permittivity; piezoceramics; piezoelectric transducers; solid solutions; ultrasonic transducers; ultrasonic velocity; EPR spectroscopy; PMN; PMN-PT materials; PMN-PbTiO3; Pb(Mg1/3Nb2/3)O3; PbMgO3NbO3-PbTiO3; PbTiO3; atomic-level chemical structure; dielectric constant; dielectric loss tangent; dielectric properties; electrical properties; electrostrictive ultrasonic transducers; lead magnesium niobate; lead titanate; longitudinal sound velocity; mechanical quality factor; morphotropic phase boundary; piezoelectric properties; powder XRD; processing; relaxor ferroelectric materials; sensor/actuator applications; solid state NMR; synthesis; thickness-mode electromechanical coupling factor; thickness-mode piezoelectric strain constant; ultrasonic transducer applications; Dielectric constant; Dielectric loss measurement; Lead; Magnesium; Niobium compounds; Relaxor ferroelectrics; Solids; Spectroscopy; Strain measurement; Titanium compounds;
Conference_Titel :
Ultrasonics Symposium, 1997. Proceedings., 1997 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-4153-8
DOI :
10.1109/ULTSYM.1997.663084
