X-ray diffraction pattern of (Sr0.85Pr0.15)TiO3 sample annealed at 1400 °C. Fragments of the diffraction pattern recorded with the integration time of 300 s are shifted along the vertical axis and shown by squares. Calculated positions of the superstructure peaks are denoted by arrows.
XANES spectra of SrTiO3(Pr) samples and reference compounds of tri- and tetra-valent praseodymium recorded at the Pr -edge at 300 K. 1—Pr2Ti2O7, 2—BaPrO3, 3, 6, 7—(Sr0.95Pr0.05)TiO3 samples annealed at 1600, 1400, and 1300 °C, respectively, 4—(Sr0.7Pr0.3)TiO3 sample annealed at 1400 °C, 5—(Sr0.85Pr0.15)TiO3 sample annealed at 1400 °C.
EXAFS spectra obtained at the Pr -edge at 300 K for (Sr0.85Pr0.15)TiO3 sample annealed at 1400 °C. The dashed line shows the Fourier-filtered spectrum ( 1.3–4.0 Å, three nearest shells) and the solid line is its best theoretical fit. The raw data are shown by the dotted line.
XANES spectra recorded at the Ti -edge at 300 K for (Sr0.85Pr0.15)TiO3 sample annealed at 1400 °C (full line) and undoped SrTiO3 sample (dashed line).
Structural parameters obtained from the EXAFS data analysis ( is the distance to the -th shell, is the Debye-Waller factor for this shell) and mean interatomic distances in the perovskite structure with the lattice parameters taken from x-ray measurements. The -factor indicates the goodness of fit of the theoretical curves to the Fourier-filtered spectra.
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