학술논문
Local structure and evolution of phase transformation in Bi0.4871Na0.4871La0.0172TiO3–BaTiO3 materials.
Document Type
Article
Author
Source
Subject
*TITANATES
*X-ray absorption near edge structure
*BARIUM titanate
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*
Language
ISSN
0272-8842
Abstract
Lead-free bismuth sodium lanthanum titanate and barium titanate (Bi 0.4871 Na 0.4871 La 0.0172 TiO 3 –BaTiO 3 ; ((1-x)BNLT-xBT) ceramic system, where x = 0.00, 0.02, 0.04, 0.06, 0.08, and 0.10, were synthesized by a modified two-step mixed oxide method. The global structure was investigated by X-ray diffraction (XRD), while the local structure was elucidated by X-ray absorption near edge structure (XANES). The XRD results indicated a rhombohedral perovskite crystal structure for x < 0.04 and a tetragonal perovskite crystal structure for x ≥ 0.04. The Ti K-edge XANES spectra indicated a change in local structure around the Ti atom, which corresponds to an evolution of phase transition from rhombohedral to tetragonal structure in BNLT-BT system with increasing BaTiO 3 content. A comparison between the measured and simulated spectra was obtained and discussed in details. [ABSTRACT FROM AUTHOR]