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Crystal structure, local structure, and defect structure of Pr-doped SrTiO3
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Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

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).


Generic image for table
Table I.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Crystal structure, local structure, and defect structure of Pr-doped SrTiO3