Complete Set of Material Constants 
of 〈011〉-Poled Rhombohedral Single-Crystal 
0.25Pb(In1/2Nb1/2)O3-0.47Pb(Mg1/3Nb2/3)O3-0.28PbTiO3
The complete set of elastic, dielectric, and piezoelectric constants of a 0.25Pb(In1/2Nb1/2)O3-0.47Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 ternary relaxor ferroelectric single crystal after 〈011〉 poling was determined by ultrasonic and resonance methods. It exhibited a rhombohedral structure as determined by powder x-ray diffraction (XRD) and x-ray fluorescence (XRF) analysis. The electromechanical coupling factor k15 and piezoelectric coefficient d15 for shear mode are 0.93 pC/N and 2658 pC/N, and k32 and d32 for transverse mode are 0.91 pC/N and -1337 pC/N, respectively. More importantly, the rhombohedral to orthorhombic phase-transition temperature is much higher than that of PZN-0.07PT or PMN-0.29PT.