1. The Behavior and Properties of New Piezoelectric Crystals at High Temperature (150 to 900C)
Maurício Pereira da Cunha
Dept. of Electrical & Computer Engineering
Lab. for Surface Science and Technology
University of Maine, Orono, ME, 04469
Major efforts: extraction of langatate acoustic constants from high temperature (HT) measurements; establishment of thin film electrodes to withstand temperature up to 1000°C; surface acoustic wave (SAW) device fabrication and test up to 1000°C; and investigation of temperature behavior of selected orientations.
Cutting LGT boule to a specific orientation.
Measurement & extraction of acoustic constants up to 1100°C using Resonant Ultrasound Spectroscopy (RUS)
Cross section of layered HT electrode
Wafers before and after optical polishing
HT SAW electrodes and devices
RUS system and furnace at UMaine
Calculation of SAW properties for temperature behavior characterization
Furnace for testing devices
SAW long-term, 6 month
Tracking a resonant peak with varying temperature
Fabricated SAW devices to verify temperature behavior of selected orientation