Ta L-3-edge XANES study of perovskite oxynitrides ATaO(2)N (A = Ca, Sr, Ba)

Title
Ta L-3-edge XANES study of perovskite oxynitrides ATaO(2)N (A = Ca, Sr, Ba)
Author(s)
김영일백승민[백승민]
Keywords
X-RAY-ABSORPTION; VISIBLE-LIGHT IRRADIATION; ELECTRONIC-PROPERTIES; WIDE-RANGE; WATER; BATAO2N; SPECTROSCOPY; PHOTOCATALYSTS; NANOCRYSTALS; OXIDATION
Issue Date
201402
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.587, pp.251 - 254
Abstract
X-ray absorption near edge structure (XANES) spectroscopy was performed at the Ta L-3-edge to probe the bonding nature of tantalum and the conduction band minimum in d(0) perovskites KTaO3, CaTaO2N, SrTaO2N, and BaTaO2N. The Ta L-3 absorption edge energy (E-0) varied from 9882.2 to 9883.6 eV in the manner, KTaO3 > BaTaO2N > SrTaO2N >= CaTaO2N. These chemical shifts and the Ta-O/N bond covalency were discussed based on the bonding geometry, electronegativity of the anion, and the electronegativity of dodecahedral cation. Deconvolution of the XANES white line peak allowed for the determinations of Ta 2p -> 5d and 2p -> continuum transition energies, from which we infer that the band gap window gradually shifts to lower energy region, going from BaTaO2N to SrTaO2N to CaTaO2N. (C) 2013 Elsevier B. V. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/33156http://dx.doi.org/10.1016/j.jallcom.2013.10.155
ISSN
0925-8388
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이과대학 > 화학생화학부 > Articles
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