Extended X-ray absorption fine structure and X-ray diffraction studies of Mn-doped PZN-PZT ceramics

• Main Authors: Athipong Ngamjarurojana, La Ongnuan Srisombat, Rattikorn Yimnirun, Supon Ananta
• Format: Journal
• Published: 2018
• Subjects: Materials Science; Physics and Astronomy
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=79955693655&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/50942
• Institution: Chiang Mai University

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 MnO2concentrations 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.