Combined study of KNbO3 and KTaO3 by different techniques of photoelectron and X-ray emission spectroscopy

✍ Scribed by A.V. Postnikov; B. Schneider; M. Neumann; D. Hartmann; H. Hesse; A. Moewes; E.Z. Kurmaev; M. Matteucci

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 216 KB
• Volume: 61
• Category: Article
• ISSN: 0022-3697
• DOI: 10.1016/s0022-3697(99)00291-7

✦ Synopsis

The new results of the experimental study of KNbO 3 and KTaO 3 by means of X-ray photoelectron spectroscopy, soft X-ray emission and X-ray fluorescence spectroscopy are presented. In particular, Nb M 4,5 spectra (5p; 4f 3 3d 5=2;3=2 transition) have been measured over a range of near-threshold excitation energies 206.5-240.6 eV, and Ta N 3 spectra (5d; 6s 3 4p 3=2 transition) over 399.4-420.4 eV at the Beamline 8.0 of the Lawrence Berkeley National Laboratory's Advance Light Source. These spectra were found to be strongly dependent on the excitation energy. Moreover, the O Ka X-ray emission spectra in both compounds as well as the valence-band photoelectron spectra are brought to the binding energy scale and discussed in combination. The trends in the spectra are explained on the basis of first-principles band-structure calculations, with the dipole transition matrix elements taken into account.