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Our previous efforts [1–7] were focused on designing, constructing and investigating miniature shock wave ferroelectric generators (FEGs) based on Pb(Zr0.52Ti0.48)O3 (PZT 52/48) poled ferroelectric ceramics (that is widely used in modern technology). In this paper, we extended our efforts to development of FEGs utilizing different type of ferroelectric materials, i.e. Pb(Zr0.95Ti0.05)O3 (PZT 95/5)...
First demonstrated in the 1950's, ferroelectric generators (FEG) have been shown to be versatile compact pulsed-power sources. An FEG works by subjecting a ferroelectric ceramic to a high-pressure shock-wave typically produced by a high-explosive charge. The resulting compression causes the ferroelectric to release the electric charge stored within its crystal structure. Most explosively-driven FEG...
In this paper a piezoelectric composite based micromachined ultrasound transducer (PC-MUT) technology is presented for fabrication of PMN-PT single crystal piezoelectric composite transducers. Micromachined PMN-PT single crystal 1-3 composites with resonance frequencies of 15 MHz-75 MHz were fabricated and characterized with coupling coefficient of 0.67-0.79. Transducers with a frequency of 75 MHz...
Micromachining of bulk piezoelectric substrates for fabrication of high frequency, broadband piezoelectric composite transducers is reported in this paper. A deep reactive ion etching process was developed for bulk PMN-PT single crystal etching with an aspect ratio of >8. A piezoelectric composite with a resonance of 75 MHz was fabricated and the electromechanical coupling coefficient was measured...
The design concept for a single-active layer ultrasound transducer array for simultaneous sub- and second-harmonic imaging of contrast agents was tested for feasibility. Using PMN-PT single crystal in a 1-3 composite, multiple matching layers and a back plate, a design for imaging at 2, 4 and 8 MHz was implemented in a series of transducers. The effects of array pitch and piezocomposite thickness...
Summary form only given. Explosively driven ferroelectric generators (FEGs) are reliable, compact, high voltage sources that utilize high pressures to liberate charge trapped in the crystal structure of ferroelectric materials. For the active ferroelectric element most FEG designs use commercial lead zirconate-titanate (PZT) compositions designed for either precision actuators or naval sonar transducers...
Relaxor piezoelectric single crystal, lead magnesium niobate-lead titanate (PMN-PT), has potential to greatly improve both piezoelectric actuator and transducer applications. High-quality PMN-PT single crystals with the diameter over 50 mm have been successfully grown along different crystallographic directions by the Bridgman technique at TRS. As a solid solution system, PMN-PT inevitably exhibits...
Various transverse length extensional modes of single crystal piezoelectrics were evaluated for high power capabilities and compared with the longitudinal "33" mode. Both bar and tube geometries, and d31 and d32 piezoelectric modes were explored. The elastic, piezoelectric and dielectric properties were evaluated under dynamic conditions using a matrix of stress, temperature and electric...
Relaxor ferroelectric single crystal, PMN-PT, has great potential to be an innovative piezoelectric material in both actuator and transducer applications. Large-size PMN-PT single crystals with diameter of 40-50 mm have been successfully grown along different crystallographic directions, including <111>, <110> and <001>, by Bridgman technique at TRS Technologies. The current status...
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