First principles calculation of chemical shifts in ELNES/NEXAFS of titanium oxides

Masato Yoshiya, Isao Tanaka, Kenji Kaneko, Hirohiko Adachi

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

First principles molecular orbital calculations of three titanium oxides are made in order to quantify the absolute transition energies of ELNES/NEXAFS at the O K and Ti L2,3 edges and to clarify the origin of their chemical shifts. The absolute transition energies as well as their chemical shifts at two edges are satisfactorily reproduced using clusters composed of 24 to 63 atoms when Slater's transition state method is employed allowing temporary spin-polarization. The O K edge shows a positive shift with the increase of the formal number of d electrons per Ti ion. The shift can be mainly ascribed to the variation of the energy of the t2g-like band, although the energy of the O 1s core-orbital varies slightly. On the other hand, the Ti L2,3 edge shows negative shift, which is found to be explained by the balance of energies of the Ti 2p and the t2g-like band. The magnitude of the chemical shifts is not significantly altered by the manner of the octahedral linkage.

Original languageEnglish
Pages (from-to)3217-3228
Number of pages12
JournalJournal of Physics Condensed Matter
Volume11
Issue number16
DOIs
Publication statusPublished - Apr 26 1999
Externally publishedYes

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Titanium oxides
Chemical shift
titanium oxides
chemical equilibrium
Orbital calculations
Spin polarization
Molecular orbitals
shift
energy
Ions
Atoms
Electrons
linkages
molecular orbitals
titanium dioxide
orbitals
polarization
atoms
ions
electrons

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

First principles calculation of chemical shifts in ELNES/NEXAFS of titanium oxides. / Yoshiya, Masato; Tanaka, Isao; Kaneko, Kenji; Adachi, Hirohiko.

In: Journal of Physics Condensed Matter, Vol. 11, No. 16, 26.04.1999, p. 3217-3228.

Research output: Contribution to journalArticle

Yoshiya, Masato ; Tanaka, Isao ; Kaneko, Kenji ; Adachi, Hirohiko. / First principles calculation of chemical shifts in ELNES/NEXAFS of titanium oxides. In: Journal of Physics Condensed Matter. 1999 ; Vol. 11, No. 16. pp. 3217-3228.
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