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JETP Letters

, Volume 84, Issue 3, pp 161–166 | Cite as

Optimization of the conditions of synchrotron Mössbauer experiment for studying electronic transitions at high pressures by the example of (Mg, Fe)O magnesiowustite

  • A. G. Gavriliuk
  • J. F. Lin
  • I. S. Lyubutin
  • V. V. Struzhkin
Article

Abstract

The effect of the experimental conditions on the shape of the nuclear resonant forward scattering (NFS) from (Mg0.75Fe0.25)O magnesiowustite has been studied at high pressures up to 100 GPa in diamond anvil cells by the method of the NFS of synchrotron radiation from the Fe-57 nuclei at room temperature. The behavior of the system in the electronic transition of the Fe2+ ion from the high-spin to low-spin state (spin crossover) near 62 GPa is analyzed as a function of the sample thickness, degree of nonhydrostaticity, and focusing and collimation conditions of a synchrotron beam. It is found that the inclusion of dynamical beats associated with the sample thickness is very important in the approximation of the experimental NFS spectra. It is shown that the electronic transition occurs in a much narrower pressure range (±6 GPa) rather than in a broad range as erroneously follows from experiments with thick samples under strongly nonhydrostatic conditions.

PACS numbers

61.50.Ks 75.50.-y 76.80.+y 

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Copyright information

© Pleiades Publishing, Inc. 2006

Authors and Affiliations

  • A. G. Gavriliuk
    • 1
    • 3
    • 4
  • J. F. Lin
    • 2
  • I. S. Lyubutin
    • 1
  • V. V. Struzhkin
    • 3
  1. 1.Shubnikov Institute of CrystallographyRussian Academy of SciencesMoscowRussia
  2. 2.Lawrence Livermore National LaboratoryLivermoreUSA
  3. 3.Geophysical LaboratoryCarnegie Institution of WashingtonWashington DCUSA
  4. 4.Institute for High Pressure PhysicsRussian Academy of SciencesTroitsk, Moscow regionRussia

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