Growth and electrical performance of Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3-Pb(Fe_(1/2)Nb_(1/2))O_3 single crystals

摘要

For the first time, we have grown ferroelectric single crystals Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3-Pb(Fe_(1/2)Nb_(1/2))O_3 (PMN-PT-PFN) from the melt by the simple slow cooling process. The chemical composition of the single crystals PMN-PT-PFN (0.59/0.31/0.10) is near the morphotropic phase boundary (MPB). X-ray diffraction (XRD) was used to study phase structure of the as-grown crystals, energy dispersive X-ray spectrometer (EDS) and electron probe micro-analyzer (EPMA) were employed to confirm the chemical composition and element distribution of the as-grown crystals, respectively. The ferroelectric, dielectric and piezoelectric properties of the as-grown PMN-PT-PFN (0.59/0.31 /0.10) single crystal oriented along the (001) axis were measured, which showed that the remnant polarization (P_r), coercive electric fields (E_c), the Curie temperature (T_c) and the piezoelectric coefficient (d_(33)) were 50.2 μC/cm~2, 13.9 kV/cm, 158 ℃ and about 1800 pC/N, respectively. All the results indicated that the PMN-PT-PFN (0.59/0.31/0.10) single crystals are promising for applying to field of high frequency.