Polarized Raman study on phase transitions of the nanodomains in 0.24Pb(In_1/2Nb_1/2)O₃–0.43Pb(Mg_1/3Nb_2/3)O₃–0.33PbTiO₃ ferroelectric single crystal

ABSTRACT: At room temperature, 0.46PIN-0.23PMN-0.33PT single crystals with compositions near the morphotropic phase boundary (MPB) can be induced ferroelectric phase transition by applying an electric field along the direction of [001]_c, and the phase change can also explain the origin of the excellent piezoelectric properties of the relaxation ferroelectric single crystal. In the phase boundary components, relaxation properties of single crystal and possible phase structure cause the structure of heterogeneity and uncertainty, and in the process of domain engineering, domain induced polarization rotation and the metastable phase, such as photograph, monoclinic which play an important role on the characteristics of piezoelectric materials. Firstly, the local lattice structure and phase transitions of unpoled 0.24PIN-0.43PMN-0.33PT single crystal were studied by Micro-Raman spectroscopy at room temperature. A total of 11 Raman active modes were ascertained using the Gauss line shape approximation, which deduces that 0.43PIN-0.26PMN-0.33PT single crystal with morph tropic phase boundary (MPB) composition has monoclinic symmetry. Then M_B-M_C monoclinic phase transition induced by electric field was studied, from the point of view of energy, the M_C monoclinic phase structure is more stable than M_B monoclinic phase structure.