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

• Main Authors: Kanchiang K., Pramchu S., Wongsaenmai S., Yimnirun R., Laosiritaworn Y.
• Format: Conference or Workshop Item
• Language: English
• Published: Taylor and Francis Inc. 2014
• Online Access: http://www.scopus.com/inward/record.url?eid=2-s2.0-84901420565&partnerID=40&md5=898ff0be0a902d8b15cf73e12e8006ce; http://cmuir.cmu.ac.th/handle/6653943832/4799
• 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 ((K0.5Na 0.5)0.935Li0.065)NbO3. From the structural relaxation, Mn3+ is substituted on Nb5+ 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 O2- 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.