Abstract:The theoretical calculation of orientation dependence of the electromechanical coupling factor for the thicknessextensional mode, k,, in KNbO3 crystal has shown that it is as high as 69% for the 49.5" rotated X-cut about the Y-axis, which is the highest among known piezoelectricS. To experimentally confirm this, the i m m c e responses of the thickness-extemional mode vibrators are measured and the related constants at^ evaluated. The measured coupling factor is as high as 70%. The strain vs electric-field beh… Show more
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