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Physics of the Solid State

, Volume 50, Issue 9, pp 1740–1746 | Cite as

Radiation defect formation in strontium and calcium fluoride crystals doped by divalent cadmium and zinc ions

  • A. V. Egranov
  • E. A. Radzhabov
  • A. I. Nepomnyashchikh
  • V. F. Ivashechkin
  • I. E. Vasil’eva
Proceedings of the XIII Feofilov Symposium “Spectroscopy of Crystals Doped by Rare-Earth and Transition-Metal Ions” (Irkutsk, July 9–13, 2007)

Abstract

Ionization radiation is shown to reduce impurity ions to the univalent state in strontium and calcium fluoride crystals doped by divalent cadmium and zinc ions. In this case, a univalent ion is surrounded by eight equivalent fluorine ions and exhibits cubic symmetry O h . At room temperature, the symmetry of the center is revealed to be sequentially lowered to C 3v and then to C 2v owing to the addition to the nearest environment of the impurity univalent ion of one or two anion vacancies, respectively, which are intrinsic defects not forming in undoped strontium and calcium fluoride crystals. Stable intrinsic defects are assumed to form through the separation of anion vacancy-interstitial fluorine ion pairs in the electric field induced by the reduced impurity ions. This electric field lowers the energy barrier to thermal separation of charged intrinsic defects.

PACS numbers

78.40.Ha 78.55.Hx 

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Copyright information

© Pleiades Publishing, Ltd. 2008

Authors and Affiliations

  • A. V. Egranov
    • 1
  • E. A. Radzhabov
    • 1
  • A. I. Nepomnyashchikh
    • 1
  • V. F. Ivashechkin
    • 1
  • I. E. Vasil’eva
    • 1
  1. 1.Vinogradov Institute of Geochemistry, Siberian BranchRussian Academy of SciencesIrkutskRussia

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