Affiliation:
1. China University of Petroleum
2. Beijing Information Science and Technology University
Abstract
The geometry structure, band structure and density of states of KH2PO4 (KDP) and NH4H2PO4 (ADP) single crystals were investigated by using density functional theory (DFT) method. Parameters including the phase velocity, electromechanical coupling factor and power flow angle (PFA) were calculated for KDP and ADP at X, Y, Z cuts, respectively. Our calculated data are in good agreement with the experimental results. Compared with quartz, KDP and ADP crystals are of lower phase velocities. Considering PFA, electromechanical coupling coefficients and phase velocity, it was concluded that the propagation direction of 60 of X-cut and Y-cut possess superior SAW performance for both KDP and ADP crystals.
Publisher
Trans Tech Publications, Ltd.
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