TABLE 48.1 Typical Acoustic Properties velocity Impedance km/s) kg/m2sx10°) D Material Longitudinal SI ongitudinal Shear (kg/mx10) Alcohol, methanol 1.103 0.872 Lig-25℃C rolled 3.04 8.21 0%Cu,30%Zn 40.6 18.l4 Cadmium sulphide 21.5 82 Piez crys Z-dir or oil 1.507 Liq 20C 4.03 46.6 28.21 5.01 44.6 8.93 1.658 1.845 1.113 Lig-25℃C 13.1 l1.4 Gold, hard drawn 3.24 1.20 63.8 626 2.24 n, cas 5.9 46.4 24.6 Lead 24.6 83 11.2 Lithium niobate, LiNbO 19.17 Piez crys X-dir Nickel 5.6 26.5 8.84 Polystyrene, styron 2.52 121 105 3.1 5.74 Piez crys X-dir 3.5 11.1 44.3 3.99 10.6 teel, mild 46.0 .3 24.2 12.5 Titanium 6.1 Water Liq-20℃C YAG Y,AlsO, 390 4.55 Cryst. Z-axis Zinc Zinc oxide 6.37 2.73 15.47 5.67 Piez crys Z-dir x104 §as5 FIGURE 48.1 (a)Slowness curves, basal plane, cubic crystal, silicon.(b) Slowness curves, basal plane, trigonal cryst quartz.© 2000 by CRC Press LLC TABLE 48.1 Typical Acoustic Properties Velocity Impedance (km/s) (kg/m2 s 3 106 ) Density Material Longitudinal Shear Longitudinal Shear (kg/m3 3103 ) Comments Alcohol, methanol 1.103 0.872 0.791 Liq. 25°C Aluminum, rolled 6.42 3.04 17.33 8.21 02.70 Isot. Brass, 70% Cu, 30% Zn 4.70 2.10 40.6 18.14 8.64 Isot. Cadmium sulphide 4.46 1.76 21.5 8.5 4.82 Piez crys Z-dir Castor oil 1.507 1.42 0.942 Liq. 20oC Chromium 6.65 4.03 46.6 28.21 7.0 Isot. Copper, rolled 5.01 2.27 44.6 20.2 8.93 Isot. Ethylene glycol 1.658 1.845 1.113 Liq. 25°C Fused quartz 5.96 3.76 13.1 8.26 2.20 Isot. Glass, crown 5.1 2.8 11.4 6.26 2.24 Isot. Gold, hard drawn 3.24 1.20 63.8 23.6 19.7 Isot. Iron, cast 5.9 3.2 46.4 24.6 7.69 Isot. Lead 2.2 0.7 24.6 7.83 11.2 Isot. Lithium niobate, LiNbO3 6.57 4.08 30.9 19.17 4.70 Piez crys X-dir 4.79 22.53 Nickel 5.6 3.0 49.5 26.5 8.84 Isot. Polystyrene, styron 2.40 1.15 2.52 1.21 1.05 Isot. PZT-5H 4.60 1.75 34.5 13.1 7.50 Piez ceram Z Quartz 5.74 3.3 15.2 8.7 2.65 Piez crys X-dir 5.1 13.5 Sapphire Al2O3 11.1 6.04 44.3 25.2 3.99 Cryst. Z-axis Silver 3.6 1.6 38.0 16.9 10.6 Isot. Steel, mild 5.9 3.2 46.0 24.9 7.80 Isot. Tin 3.3 1.7 24.2 12.5 7.3 Isot. Titanium 6.1 3.1 27.3 13.9 4.48 Isot. Water 1.48 1.48 1.00 Liq. 20°C YAG Y3Al15O12 8.57 5.03 39.0 22.9 4.55 Cryst. Z-axis Zinc 4.2 2.4 29.6 16.9 7.0 Isot. Zinc oxide 6.37 2.73 36.1 15.47 5.67 Piez crys Z-dir FIGURE 48.1 (a) Slowness curves, basal plane, cubic crystal, silicon. (b) Slowness curves, basal plane, trigonal crystal, quartz