Extended X-Ray Absorption Fine Structure and X-Ray Diffraction Studies of Mn-Doped PZN-PZT Ceramics

Abstract

In this work, the selected compositions of a combination between perovskite piezoelectric ceramics lead zinc niobate (PZN) and lead zirconate titanate (PZT), close to the morphotropic phase boundary (MPB) i.e. the 0.2PZN-0.8PZT, doped with MnO₂ concentrations of 0.0–0.9 wt% were fabricated by a simple solid-state reaction and a pressureless sintering techniques. X-ray diffraction (XRD) spectra from these materials reveal transformation of the tetragonal into the rhombohedral structure. The local structure of Mn was analyzed by mean of synchrotron extended X-ray absorption fine structure (EXAFS) measurements at the Mn K-edge. The correlation between the structural changes and the Mn content was analyzed and compared. The EXAFS analysis indicates that Mn ions should occupy the B-sites in PZN-PZT structure and plays a critical role for the hard ferroelectric behavior of the materials.

Keywords:

• Piezoceramics
• perovskite
• EXAFS
• X-ray diffraction

Acknowledgment

This work was supported by the Synchrotron Light Research Institute (Public Organization), Thailand (GRANT 1-2551/PS02) and the Faculty of Science, Chiang Mai University.