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Piezoelectric coupling factor calculations for plates of langatate driven in simple thickness modes by lateral-field-excitation

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2 Author(s)
Khan, A. ; Adv. Cerametrics Inc., Lambertville, NJ, USA ; Ballato, A.

Piezoelectric coupling factors for langatate (La/sub 3/Ga/sub 5.5/Ta/sub 0.5/O/sub 14/) single-crystals driven by lateral-field-excitation have been calculated using the extended Christoffel-Bechmann method. Calculations were made using published materials constants. The results are presented in terms of the lateral piezoelectric coupling factor as functions of in-plane (azimuthal) rotation angle for the three simple thickness vibration modes of some nonrotated, singly-rotated, and doubly-rotated orientations. It is shown that lateral-field-excitation offers the potential to eliminate unwanted vibration modes and to achieve considerably greater piezoelectric coupling versus thickness-field-excitation for the rotated cuts considered and for a doubly-rotated cut that is of potential technological interest.

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:49 ,  Issue: 7 )