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Physics and Chemistry of Minerals

, Volume 35, Issue 1, pp 1–9 | Cite as

Temperature-jump induced cation exchange kinetics in (Co0.1Mg0.9)2SiO4 olivine: an in situ optical spectroscopic study

  • Jianmin ShiEmail author
  • Stefan G. Ebbinghaus
  • Klaus Dieter Becker
Original Paper

Abstract

In the olivine crystal structure, cations are distributed over two inequivalent octahedral sites, M1 and M2. Kinetics of cation exchange between the two octahedral sites in (Co0.1Mg0.9)2SiO4 single crystal have been studied in the temperature range from 600 to 800°C by monitoring the time evolution of the absorbance of Co2+ ions in M1 or M2 sites using optical spectroscopy after rapid temperature jumps. It was found from such temperature-jump induced relaxation experiments that with increasing temperature the absorbance of Co2+ ions in the M1 site decreases while that in the M2 site increases. This indicates a tendency of Co2+ cations to populate the M2 site with increasing temperatures and vice versa. The experimental relaxation data can be modeled using a triple exponential equation based on theoretical analysis. Activation energies of 221 ± 4 and 213 ± 10 kJ/mol were derived from relaxation experiments on the M2 site and M1 site, respectively, for the cation exchange processes in (Co0.1Mg0.9)2SiO4 olivine. Implications for cation diffusion at low temperatures are discussed.

Keywords

Kinetics Olivine Cation distribution Optical spectroscopy Temperature jump Diffusion 

Notes

Acknowledgments

The authors would like to thank Dr. S. Kipp, M. Schrader, S. Dlugocz and A. Tiefnig for their help during this work. Thanks are also due to Prof. P. G. Jones’s group for performing single crystal diffraction experiments and Dr. J. Koepke, University of Hanover, for electron microprobe analysis. Financial support from Deutsche Forschungsgemeinschaft (DFG) is greatly acknowledged.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Jianmin Shi
    • 1
    Email author
  • Stefan G. Ebbinghaus
    • 2
  • Klaus Dieter Becker
    • 1
  1. 1.Institute of Physical and Theoretical ChemistryBraunschweig University of TechnologyBraunschweigGermany
  2. 2.Solid State Chemistry, Institute of PhysicsUniversity of AugsburgAugsburgGermany

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