Simulation of surface acoustic wave propagating characteristics in relaxor based ferroelectric single crystals poled along 011

摘要

The propagation characteristics of surface acoustic waves (SAWs) on Y-cut X propagating Pb(Inn_1/2nNbn_1/2n)On₃n-Pb(Mgn_1/3nNbn_2/3n)On₃n-xPbTiOn₃n(PIN-PMN-xPT) substrates with different PT composition (x=0.28 and 0.32) were theoretically analyzed. The calculated results indicated existence of a shear horizontal (SH) SAW with ultrahigh electromechanical coupling factor Kn²n. The variation of SAWs properties with rotated Euler angle θ was also investigated. The largest Kn²nfor the SH SAW could reach 60% when θ=45°. The Kn²nfor the SH SAW with different PT contents was calculated, and it was found that the Kn²nfor the 0.32PT substrate was larger than that for 0.28PT substrate. The influence of Mn-doping on SAW properties for YX-PIN-PMN-0.28PT substrate was also analyzed. The simulated results showed that after Mn-doping the velocity increased while the Kn²ndecreased, which confirmed the phenomenon of “hard” effect caused by Mn-doping.