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Identification of Local Phase of Nanoscale BaTiO3 Powders by High-Resolution Electron Energy Loss Spectroscopy

Published online by Cambridge University Press:  06 August 2013

Sun-Min Moon ,
Xiaohui Wang  and
Nam-Hee Cho
Sun-Min Moon
Affiliation:
Department of Materials Science and Engineering, Inha University, Incheon 402-751, Republic of Korea
Xiaohui Wang
Affiliation:
Department of Materials Science and Engineering, Tsinghua University, Baijing 100084, China
Nam-Hee Cho*
Affiliation:
Department of Materials Science and Engineering, Inha University, Incheon 402-751, Republic of Korea
*
*Corresponding author. E-mail: nhcho@inha.ac.kr
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Abstract

The electron energy loss spectroscopy (EELS) technique was applied to investigate the local variation in the phase of barium titanate (BaTiO3) ceramics. It was found that the fine structure of the titanium L2,3 edge and their satellite peaks were sensitively varied with the tetragonal–cubic phase transition. The peak splitting of Ti-L3 edge of tetragonal-phased BaTiO3 ceramics was widened because of the increased crystal field effect compared with that of cubic-phased BaTiO3. In case of nanoscale BaTiO3 powders, the L3 edge splitting of the core region was found to be smaller than that of the shell region. The energy gap between peaks t2g and eg varied from 2.36 to 1.94 eV with changing the probe position from 1 to 20 nm from the surface. These results suggest that the EELS technique can be used to identify the local phase of sintered BaTiO3 ceramics.

Keywords

BaTiO3phaseEELSnanopowdertetragonalcubic
Type
Research Article
Information
Microscopy and Microanalysis , Volume 19 , Supplement S5: IUMAS , August 2013 , pp. 123 - 126
Copyright
Copyright © Microscopy Society of America 2013 

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