Pb(Mg_1/3Nb_2/3)O₃-Pb(Fe_1/2Nb_1/2)O₃-PbTiO₃ (PMN-PFN-PT) single crystal was grown successfully by slow cooling method. Structure, domain configuration and frequency dependent dielectric properties of [001]-oriented as-grown single crystal had been analyzed. X-ray diffraction and polarized Raman spectra analyzed indicated a pure perovskite phase with tetragonal symmetry at room temperature. Domain configuration of the poled [001]-oriented PMN-PFN-PT was observed for the first time using a polarized light microscopy (PLM). Domain on (001) face exhibited a straight stripe-like morphology with domain size on the scale of 10um, and the extinction of 90^o domains at P/A:0^o revealed a tetragonal structure. Dielectric permittivity of [001]-oriented single crystal at room temperature exhibited a strong dependence with frequency and decreased sharply with increasing frequency.

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