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

The propagation characteristics of surface acoustic waves (SAWs) on Y-cut X propagating Pb(In 1/2 Nb 1/2 )O 3 -Pb(Mg 1/3 Nb 2/3 )O 3 -xPbTiO 3 (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 K 2 . The variation of SAWs properties with rotated Euler angle θ was also investigated. The largest K 2 for the SH SAW could reach 60% when θ=45°. The K 2 for the SH SAW with different PT contents was calculated, and it was found that the K 2 for 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 K 2 decreased, which confirmed the phenomenon of “hard” effect caused by Mn-doping.