Abstract
Lead magnesium niobate—lead titanate (PMN-PT) single crystals have been successfully commercialized in medical ultrasound imaging. The superior properties of PMN-PT crystals over the legacy piezoelectric ceramics lead zirconate titanate (PZT) enabled ultrasound transducers with enhanced imaging (broad bandwidth and improved sensitivity). To obtain high quality and relatively low cost single crystals for commercial production, PMN-PT single crystals were grown with modified Bridgman method, by which crystals were grown directly from stoichiometric melt without flux. For ultrasound imaging application, [001] crystal growth is essential to provide uniform composition and property within a crystal plate, which is critical for transducer performance. In addition, improvement in crystal growth technique is under development with the goals of improving the composition homogeneity along crystal growth direction and reducing unit cost of crystals. In recent years, PIN-PMN-PT single crystals have been developed with higher de-poling temperature and coercive field to provide improved thermal and electrical stability for transducer application.
Highlights
IntroductionLead magnesium niobate—lead titanate (PMN-PT) single crystals have superior dielectric and piezoelectric properties to the legacy lead zirconate titanate (PZT) polycrystalline ceramics, with electromechanical coupling factor k33 ~ 0.9, and piezoelectric charge coefficient d33 > 1500 pC/N [1,2,3,4,5]
Lead magnesium niobate—lead titanate (PMN-PT) single crystals have superior dielectric and piezoelectric properties to the legacy lead zirconate titanate (PZT) polycrystalline ceramics, with electromechanical coupling factor k33 ~ 0.9, and piezoelectric charge coefficient d33 > 1500 pC/N [1,2,3,4,5].During the past decade, significant progresses have been made on crystal growth and property characterization [6,7,8,9]
PMN-PT and PIN-PMN-PT single crystals were successfully grown with modified Bridgman method in both [001] and [011] directions
Summary
Lead magnesium niobate—lead titanate (PMN-PT) single crystals have superior dielectric and piezoelectric properties to the legacy lead zirconate titanate (PZT) polycrystalline ceramics, with electromechanical coupling factor k33 ~ 0.9, and piezoelectric charge coefficient d33 > 1500 pC/N [1,2,3,4,5]. Like PMN-PT, ternary PIN-PMN-PT crystals were successfully grown with modified Bridgman method along different crystallographic directions including the commonly used [001] and [011] directions. For both PMN-PT and PIN-PMN-PT crystals grown by the melt method, the PT content gradually increases as crystal grows because of chemical segregation [8,17,18]. Crystal growth and property characterization of PMN-PT and PIN-PMN-PT are presented. Selected properties along the growth direction of PMN-PT crystals grown by Bridgman method were characterized for the whole as-grown crystal boule to provide the full range of property variation. Property improvements of the ternary PIN-PMN-PT crystals over the binary PMN-PT are presented and discussed
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
