A Raman spectroscopic study on the active site of sodium cations in the structure of Na2Ti3O7 during the adsorption of Sr2+ and Ba2+ cations

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Title A Raman spectroscopic study on the active site of sodium cations in the structure of Na2Ti3O7 during the adsorption of Sr2+ and Ba2+ cations
Author Liu, Hongwei; Yang, Dongjiang; Waclawik, Eric R.; Ke, Xuebin; Zheng, Zhanfeng; Zhu, Huaiyong; Frost, Ray L.
Journal Name Journal of Raman Spectroscopy
Year Published 2010
Place of publication United Kingdom
Publisher John Wiley & Sons Ltd.
Abstract A detailed study on the structural deformation of trititanate nanofibers after the adsorption of divalent strontium (Sr) and barium (Ba) cationswas conducted by using Raman spectroscopy, X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that the Raman bands at 309 cm−1 corresponding to very long Ti–O bonds (2.2 Å) and at 883 cm−1 corresponding to the very short Ti–O bonds (1.7 Å) decreased in intensity after the adsorption of Ba2+ and Sr2+ cations. Additionally, the band at 922 cm−1 corresponding to an intermediate length Ti–O bond was observed to weaken with the adsorption of divalent cations, indicating that the TiO6 octahedra in Na2Ti3O7 aremore regular. These results suggest that the active sodium (Na+) cations in Na2Ti3O7 should be located at the corner of the TiO6 octahedral slabs, i.e. the plane (003). This was further confirmed by a large decrease of diffraction intensity of the plane (003) observed in the XRD pattern.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1002/jrs.2634
Volume 41
Issue Number 12
Page from 1792
Page to 1796
ISSN 0377-0486
Date Accessioned 2011-07-18
Date Available 2011-08-12T06:21:52Z
Language en_AU
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Physical Chemistry
URI http://hdl.handle.net/10072/39976
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1x

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