Structural, dielectric, and ferroelectric characteristics of the low-temperature sintered 65PMN-35PT sample for electroceramic applications

Abstract

A single-phase 0.65PbMg1/3Nb2/3O3-0.35PbTiO3 (65PMN-35PT) ceramic was synthesized at a relatively low temperature (875 oC) using a modified columbite method. X-ray diffraction analysis confirmed the single-phase formation of perovskite 65PMN-35PT with a tetragonal structure. Morphological studies indicated that the sample consisted of small grains with a size of ≤ 2 µm. The dielectric properties of the material demonstrate its relaxor behavior near the ferroelectric transition temperature, TC = 457 K. The saturation and remnant polarization values of approximately 25.9 and 20.1 µC cm−2 were achieved for an electrically poled sample. Additionally, the poling induced a negative internal electric field of about − 0.2 kV cm−1 was detected due to the presence of ferroelectric nano-grains in this bulk 65PMN-35PT sample. These observed characteristics of the pyrochlore-free 65PMN-35PT ceramic are similar to those of its single-crystal counterpart.