Propagation Characteristics of Surface Acoustic Waves on K₃Li₂Nb₅O₁₅

The contour maps of the phase velocity v f , the temperature coefficient of delay (TCD), the electromechanical coupling coefficient K 2 , and the power flow angle (PFA) of surface acoustic waves (SAWs) on K 3 Li 2 Nb 5 O 15 are presented for Euler angles (φ, θ, ψ) with φ=0, 10°, 20°, 30°, and 40°, and -180° ≤φ, θ< 180°. These maps computed by Campbell and Jonnes' method reveal that SAWs on K 3 Li 2 Nb 5 O 15 with Euler angles (4°, 49°, 92°), (33°, 76°, 126°), and (30°, 86°, 151°) have v f of 3255 m/s, 3383 m/s, and 3728 m/s, K 2 of 0.0115, 0.0147, and 0.0045, the values of first-order TCD of 0.02 ppm/°C, 0.05 ppm/°C, and 0.04 ppm/°C, and PFAs of 0.005°, 4.7°, and 5.1°, respectively.