Abstract
The aging characteristics and influence of electric field poling on the phase transitions in (1-x)Pb (Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT) [110]-oriented single crystal were examined through temperature dependent complex capacitance study. In addition to two phase transition anomalies exhibited by the crystal in the virgin state, other phase transition instabilities were observed in the complex capacitance of the crystal under the external applied electric field. The aging behavior deviated from the linear logarithmic law and followed the stretched exponential expression typical for relaxor ferroelectrics. Moreover, aging decreased with frequency while it became faster with increase in temperature towards the paraelectric – ferroelectric structural phase transition temperature.
Highlights
Single crystals of perovskite-based solid solutions of canonical relaxor Pb(Mg1/3Nb2/3)O3 (PMN) and classical ferroelectric PbTiO3 (PT), commonly known as relaxor ferroelectrics (RFEs), are very important for ferroelectric industry due to their giant piezoelectric properties [1, 2]
It is generally agreed that the peculiar physical characteristics of RFE are attributed to the intrinsic inhomogeneity giving rise to static chemically ordered regions (CORs) and polar nanoregions (PNRs) at different length scales, exhibiting clear signatures of structural hierarchy in RFE materials [3]
The structural investigations by high-resolution synchrotron x-ray diffraction [5] and further supported by the first principle calculations [6], established that morphotropic phase boundary (MPB) in RFE perovskite oxides is a narrow region consisting of monoclinc and other mixed phases, that contribute to the possible giant piezoelectric activity through rotation of polarization vector
Summary
Single crystals of perovskite-based solid solutions of canonical relaxor Pb(Mg1/3Nb2/3)O3 (PMN) and classical ferroelectric PbTiO3 (PT), commonly known as relaxor ferroelectrics (RFEs), are very important for ferroelectric industry due to their giant piezoelectric properties [1, 2]. In spite of the extensive research carried out on (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT) single crystals and other related perovskite oxides, the phase transition behavior exhibited by the dielectric properties of these materials especially near the morphotropic phase boundary (MPB) region remains far from clear. The structural investigations by high-resolution synchrotron x-ray diffraction [5] and further supported by the first principle calculations [6], established that MPB in RFE perovskite oxides is a narrow region consisting of monoclinc and other mixed phases, that contribute to the possible giant piezoelectric activity through rotation of polarization vector. Field induced polarization rotation results in the formation of intermediate monoclinic (M) and/or othorhombic (O) phases in the MPB region with their co-existence along with rhombohedral (R) and tetragonal (T) phases at the extremities of MPB
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