X-ray absorption spectroscopy identification of Mn-doped Bi 3.25La0.75Ti3O12 ceramics

• Main Authors: Kanchiang K., Siriprapa P., Yimnirun R., Jiansirisomboon S., Laosiritaworn Y.
• Format: Article
• Language: English
• Published: 2014
• Online Access: http://www.scopus.com/inward/record.url?eid=2-s2.0-84891819734&partnerID=40&md5=27e765eb7e9be84d5e7a96e15eceecc6; http://cmuir.cmu.ac.th/handle/6653943832/7303
• Institution: Chiang Mai University

In this work, x-ray absorption spectroscopy was performed to characterize Mn-doped Bi3.25La0.75Ti3O12 (BLT) ceramics with various MnO2 dopants. The x-ray absorption near-edge structure (XANES) was analyzed in combination with first principle calculation of Mn K-edge to identify atomic position of Mn in BLT. The result confirms Mn4+ substituting on Ti4+-site in BLT. Further, the extended x-ray absorption fine structure (EXAFS) was examined where Mn K-edge of Mn-doped BLT was compared to that of Ti K-edge of BLT in R-space. The result shows radial distances between Mn4+ and O2- ions in ab-axis are almost equal and decrease with increasing Mn-doping contents. This is strong evidence that Mn4+ substituting on Ti4+ site can be reduced the orthorhombicity, which increase the polarization domains size and enhance remnant polarization, speed up the polarization domains movement and lessen coercive field. © 2013 Copyright Taylor and Francis Group, LLC.