Tuesday, March 1, 2005, 10:30 am — Seminar Room, Bldg. 725
Analysis of the pre-edge structure in K edge spectra of transition metal atoms reveals information about electronic and atomic structures of transition metal oxides. In addition to the valence and coordination number of metal atoms one can determine the lattice local distortion near metal atom sites and distribution of 4d metal atoms in solid solutions. Information obtained by the pre-edge structure analysis is somewhat complementary to that obtained by Bragg diffraction and EXAFS. Combined processing of the data of these three experiments allows to determine such subtle details of atomic motion as two and three-body correlations.
In this talk I will discuss:
- The origin of the pre-edge structure in K spectra of transition metal atoms in oxides.
- Quantitative determination of the lattice local distortions by the pre-edge structure analysis.
- Applications of the method proposed for studies of phase transitions and local lattice distortions in ferroelectric crystals with perovskite structure.
- Lead zirconate-titanate (PZT) solid solutions.
- Combined processing of Bragg diffraction and XAFS data for lead titanate cubic phase
Hosted by: Anatoly Frenkel
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