Abstract: Relaxor ferroelectric single crystal Pb(Mg_1/3Nb_2/3)O₃-38%PbTiO₃ (PMNT62/38) was grown
directly from melt by a modified Bridgman technique. The XRD analysis confirms that PMNT62/38 single crystal has a tetragonal structure at room
temperature. The ε_r-T peak at T_c and little dispersion over measured temperature range indicate that the PMNT62/38 single crystal is
a normal ferroelectric. The full set of electromechanical properties was determined by using an impedance resonance technique, the Curie temperature
being about 174℃, piezoelectric constant d₃₃～300pC/N, and permittivity ε₃₃～734 and ε₁₁～4301. Electric-mechanical coupling coefficients measured are k₃₃ 84.6%, k_t 60.8%,
k₃₁ 44.5% and k₁₅ 45.9%.

Key words: PMN-PT single crystal, impedance resonance technique, electromechanical properties