Table 1.

Relationship between phase velocities and elastic constants for 3m symmetry and the measured values of phase velocities in 0.26Pb(In_1∕2Nb_1∕2)O₃–0.46Pb(Mg_1∕3Nb_2∕3)O₃–0.28PbTiO₃ single-domain single crystals.

Phase velocities	$v_l^{\left[111\right]}$	$v_s^{\left[111\right]}$	$v_l^{\left[1\overline{1}0\right]}$	$v_{s\Vert }^{\left[1\overline{1}0\right]}$	$v_{s\perp }^{\left[1\overline{1}0\right]}$	$v_l^{\left[11\overline{2}\right]}$	$v_{s\Vert }^{\left[11\overline{2}\right]}$	$v_{s\perp }^{\left[11\overline{2}\right]}$
Related constants	$c_{33}^D$	$c_{44}^E$	$c_{11}^E$	c1	c2	c3	$c_{66}^E$	c4
Measured velocities (m∕s)	4945	1610	5086	1457	3060	5017	2795	2804