Physics of the Solid State

, Volume 54, Issue 5, pp 975–979 | Cite as

XAFS studies of the local structure and charge state of the Pr impurity in SrTiO3

Proceedings of the XIX All-Russian Conference on Physics of Ferroelectrics (VKS-XIX) Moscow, Russia, June 19–23, 2011

Abstract

Solid solutions of (Sr1 − xPrx)TiO3 have been studied using X-ray methods. It has been shown that, with an increase in the praseodymium concentration, the temperature of the structural phase transition to the phase with space group I4/mcm increases and, at x ≥ 0.15, the structure at 300 K is tetragonal. X-ray absorption fine structure (XAFS) spectroscopy studies have revealed that Pr ions are predominantly in the charge state 3+ and occupy the Sr sites. No indications of the off-centering of Pr atoms at the Sr sites have been revealed. The local environment of Pr atoms is characterized by a strong relaxation of the oxygen atoms, the value of which corresponds to the difference between the ionic radii of Pr3+ and Sr2+. It has been found that, in the second shell, there occurs a significant repulsion of the Pr3+ and Ti4+ ions, which is responsible for the weak dependence of the lattice parameter in the solid solution on the praseodymium concentration.

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References

  1. 1.
    V. V. Lemanov, Ferroelectrics 226, 133 (1999).CrossRefGoogle Scholar
  2. 2.
    A. Durán, E. Martínez, J. A. Díaz, and J. M. Siqueiros, J. Appl. Phys. 97(10), 104109 (2005).ADSCrossRefGoogle Scholar
  3. 3.
    A. Durán, F. Morales, L. Fuentes, and J. M. Siqueiros, J. Phys.: Condens. Matter 20(8), 085219 (2008).ADSCrossRefGoogle Scholar
  4. 4.
    R. Ranjan, R. Hackl, A. Chandra, E. Schmidbauer, D. Trots, and H. Boysen, Phys. Rev. B: Condens. Matter 76(22), 224109 (2007).ADSCrossRefGoogle Scholar
  5. 5.
    R. Ranjan, R. Garg, R. Hackl, A. Senyshyn, E. Schmidbauer, D. Trots, and H. Boysen, Phys. Rev. B: Condens. Matter 78(9), 092102 (2008).ADSCrossRefGoogle Scholar
  6. 6.
    R. Garg, A. Senyshyn, H. Boysen, and R. Ranjan, Phys. Rev. B: Condens. Matter 79(14), 144122 (2009).ADSCrossRefGoogle Scholar
  7. 7.
    A. I. Lebedev, I. A. Sluchinskaya, V. N. Demin, and I. Manro, Izv. Akad. Nauk, Ser. Fiz. 60(10), 46 (1996).Google Scholar
  8. 8.
    A. M. Glazer, Acta Crystallogr., Sect. A: Cryst. Phys., Diffr., Theor. Gen. Crystallogr. 31, 756 (1975).ADSCrossRefGoogle Scholar
  9. 9.
    R. D. Shannon, Acta Crystallogr., Sect. A: Cryst. Phys., Diffr., Theor. Gen. Crystallogr. 32, 751 (1976); http://abulafia.mt.ic.ac.uk/shannon/ ADSCrossRefGoogle Scholar
  10. 10.
    A. I. Lebedev, I. A. Sluchinskaya, A. Erko, A. A. Veligzhanin, and A. A. Chernyshov, Phys. Solid State 51(5), 991 (2009).ADSCrossRefGoogle Scholar

Copyright information

© Pleiades Publishing, Ltd. 2012

Authors and Affiliations

  1. 1.Moscow State UniversityMoscowRussia
  2. 2.Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung (BESSY)BerlinGermany

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