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

TL;DR

This study reports the synthesis and characterization of a low-temperature sintered 65PMN-35PT ceramic, revealing its ferroelectric, dielectric, and microstructural properties suitable for electroceramic applications.

Contribution

It introduces a modified columbite method for synthesizing single-phase 65PMN-35PT at 875°C, with detailed analysis of its structural and ferroelectric properties.

Findings

Single-phase tetragonal 65PMN-35PT confirmed by X-ray diffraction

Dielectric relaxor behavior near 457 K transition temperature

Achieved polarization values of approximately 25.9 and 20.1 micro-C cm-2

Abstract

A single-phase 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 about 2 micro-m. 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 micro-C 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.