Surface and thickness effect on the ferroelectric, dielectric and pyroelectric properties of Mn-doped Pb(Mg1/3Nb2/3)O3–0.28PbTiO3 single crystals

Abstract

Ferroelectric, dielectric and pyroelectric properties of Mn-doped Pb(Mg1/3Nb2/3)O3–0.28PbTiO3 (PMN-0.28 PT) single crystals has been investigated with surfaces of different roughness, and thickness in the range of 487–16 μm. The crystals were grown by modified Bridgman method and treated by mechanical lapping and chemical mechanical polishing (CMP) for different thickness and surface. The experimental results indicate that the lapping process deteriorates the ferroelectric, dielectric, and pyroelectric performances by introducing domain reorientation and damage into the surface, which can be substantially reduced by polishing process. The surface state exhibits greater impact on the ferroelectric, dielectric and pyroelectric performances when the sample thickness becomes smaller. By lapping, the 109° and 71° domain reorientation occurs along with the generation of non-ferroelectric damage layer, the surface stress and defects.