Title :
Lithium tetraborate transducers
Author :
Ballato, Arthur ; Kosinski, John ; Lukaszek, Ted
Author_Institution :
US Army Electron. Technol. & Devices Lab., Fort Monmouth, NJ, USA
Abstract :
Lithium tetraborate is a tetragonal material of considerable promise for frequency control and signal processing applications. It exhibits piezoelectric coupling values that fall between those of lithium niobate and quartz, but possesses orientations for which the temperature coefficient of frequency and delay time is zero for bulk and surface acoustic waves. The properties of two doubly rotated bulk wave resonator orientations having first- and second-order temperature coefficients equal to zero are discussed. These are suitable for shear and compressional wave transducers in applications where very low temperature sensitivity is required simultaneously with moderately strong piezocoupling coefficients.<>
Keywords :
crystal resonators; frequency control; lithium compounds; piezoelectric materials; piezoelectric thin films; piezoelectric transducers; Li/sub 2/B/sub 4/O/sub 7/ transducers; bulk acoustic waves; compressional wave transducers; crystal cuts; doubly rotated bulk wave resonator orientations; first order temperature coefficient; frequency control; low temperature sensitivity; orientations; piezoelectric coupling values; second-order temperature coefficients; shear wave transducers; strong piezocoupling coefficients; surface acoustic waves; temperature coefficient of delay time; temperature coefficient of frequency; tetragonal material; zero temperature coefficient; Acoustic signal processing; Acoustic transducers; Acoustic waves; Delay effects; Frequency control; Lithium niobate; Piezoelectric transducers; Propagation delay; Surface acoustic waves; Temperature sensors;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
