X-ray absorption spectroscopy identification of Mn-doped Bi 3.25La0.75Ti3O12 ceramics
In this work, x-ray absorption spectroscopy was performed to characterize Mn-doped Bi 3.25 La 0.75 Ti 3 O1 2 (BLT) ceramics with various MnO 2 dopants. The x-ray absorption near-edge structure (XANES) was analyzed in combination with first principle calculation of Mn K-edge to identify atomic positi...
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| Main Authors: | , , , , |
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| Format: | Journal |
| Published: |
2018
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| Online Access: | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84891819734&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/48294 |
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| Institution: | Chiang Mai University |
| Summary: | In this work, x-ray absorption spectroscopy was performed to characterize Mn-doped Bi 3.25 La 0.75 Ti 3 O1 2 (BLT) ceramics with various MnO 2 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 Mn 4+ substituting on Ti 4+ -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 Mn 4+ and O 2- ions in ab-axis are almost equal and decrease with increasing Mn-doping contents. This is strong evidence that Mn 4+ substituting on Ti 4+ 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. |
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