Workshop for AI-Powered Materials Discovery at Great Plains

Growth and characterization of PMN-PT crystals by vertical gradient freeze (VGF) technology

Not scheduled

20m

University of South Dakota

Future Directions in AI for Particle Physics, Nuclear Physics, and Materials Science

Speaker

Dr Guojian Wang (Luxium solutions)

Description

Relaxor ferroelectric Lead Magnesium Niobate-Lead Titanate (PMN-PT) crystal has been used in various applications such as medical ultrasound imaging, SONAR, micro-actuation, and energy harvesting due to its high electromechanical coupling coefficient and high piezoelectric coefficient. However, the high cost of PMN-PT stems from low crystal growth yield and limits the wider its application. Vertical gradient freeze (VGF) is a crystal growth method requiring relatively simple equipment and producing high quality crystals with low dislocation densities and less impurity striations and facets. This method has been extensively used to grow semiconductor and optical crystals. Here, we report the growth of ϕ 6” PMN-PT crystals by vertical gradient freeze (VGF) technology. COMSOL was used to simulate the furnace thermal field to help increase the furnace simulation to optimize the furnace geometry and increase the efficiency of experiment. The crystal structure, dielectric and piezoelectric properties of grown crystals were studied.

This project is supported by Office of Naval Research (ONR) Contract N00014-21-C-1037, and Luxium Solutions.