학술논문
Leaky surface acoustic waves in single-crystal AlN substrate
Document Type
Conference
Author
Source
Proceedings. IEEE Lester Eastman Conference on High Performance Devices, 2004. High Performance Devices High Performance Devices, 2004. Proceedings. IEEE Lester Eastman Conference on. :213-222 2004
Subject
Language
Abstract
We report on the velocity V and the electromechanical coupling coefficient K/sup 2/ of the first and the second leaky surface acoustic waves in various propagation directions in the a-plane AlN single-crystal. For c-propagation direction, the second leaky wave exhibited the velocity of 11016 m/s and K/sup 2/ of 0.45%. For this direction, the temperature coefficient of frequency was found to be -30 ppm//spl deg/C. A near match of the velocities of the plane and leaky waves in the a-plane AlN allowed us to establish analytical relationships between the piezoelectric and elastic constants. A full set of elastic and piezoelectric constants of AlN has been evaluated by fitting the measured and calculated dependencies of velocities and electromechanical coupling coefficients on the propagation direction for both Rayleigh and leaky waves.