X-ray absorption spectroscopy analysis of the effect of MnO<inf>2</inf>doping on local structure of ((K<inf>0.5</inf>Na<inf>0.5</inf>)<inf>0.935</inf>Li<inf>0.065</inf>)NbO<inf>3</inf>ceramics

• Main Authors: Kanokwan Kanchiang, Sittichain Pramchu, Supattra Wongsaenmai, Rattikorn Yimnirun, Yongyut Laosiritaworn
• Format: Journal
• Published: 2018
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84901420565&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/45009
• Institution: Chiang Mai University

In this work, the extend X-ray absorption fine structure (EXAFS) analysis was performed in combination with the density functional theory (DFT) calculation to investigate local structure of Mn-doped ((K 0.5 Na 0.5 ) 0.935 Li 0.065 )NbO 3 . From the structural relaxation, Mn 3+ is substituted on Nb 5+ to produce oxygen vacancy in the longest bond length in c-axis. Further, from the EXAFS Fourier transform comparison in R-space, the bond lengths between Mn 3+ and O 2- are almost equal in both ab-and c-axis with increasing Mn-doping contents. This is strong evidence that Mn-doping played an important role in producing the polarization domains in opposite direction, which diminish remnant polarization, pinning the domains wall movement and increase coercive field. © 2014 Taylor & Francis Group, LLC.