Home Physical Sciences Coupled substitution of Fe3+ and H+ for Si in wadsleyite: A study by polarized infrared and Mössbauer spectroscopies and single-crystal X-ray diffraction
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Coupled substitution of Fe3+ and H+ for Si in wadsleyite: A study by polarized infrared and Mössbauer spectroscopies and single-crystal X-ray diffraction

  • Takaaki Kawazoe EMAIL logo , Alok Chaudhari , Joseph R. Smyth and Catherine McCammon
Published/Copyright: April 30, 2016
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American Mineralogist
From the journal American Mineralogist Volume 101 Issue 5

Abstract

Coupled substitution of Fe3+ and H+ for Si in wadsleyite was studied by polarized infrared and Mössbauer spectroscopies and single-crystal X-ray diffraction. Single crystals of Fe-bearing hydrous wadsleyite were synthesized at 16 GPa and 1870 K using a Kawai-type multi-anvil apparatus. Water and Fe contents of the sample were 0.19–0.26 wt% H2O and Fe/(Mg+Fe) of 0.099(2), respectively. Mössbauer spectra showed 13(4)% Fe3+/ΣFe and Fe3+ at the tetrahedral site with 5(3)% IVFe3+/ΣFe. Crystal structure refinement by single-crystal X-ray diffraction indicated that Fe (presumably Fe3+) occupied 4.9(5)% of the tetrahedral site. Infrared light polarized with the electric vector E//a and c was absorbed at 3477(2) cm–1 while no absorption was observed at the region in spectra with E//b. The pleochroic behavior of the 3477 cm–1 band can be interpreted as protonation of silicate oxygen O3 in Fe-bearing hydrous wadsleyite. The protonation of O3 together with the presence of Fe3+ at the tetrahedral site confirms the coupled substitution of Fe3+ and H+ for Si in Fe-bearing hydrous wadsleyite.

Keywords: Wadsleyite; hydrogen; ferric iron; polarized infrared spectroscopy; single-crystal X-ray diffraction; Mössbauer spectroscopy

Acknowledgments

We thank T. Boffa Ballaran, J. Buchen, and F. Heidelbach for their help for orienting the crystals. We are grateful to H. Keppler, R. Njul, D. Krausse, and H. Fischer for their support for IR spectroscopy, the sample polishing, the chemical analysis and manufacturing the cell assembly parts, respectively. J.R.S. thanks the U.S. National Science Foundation for support under Grant EAR 14-16979. We appreciate reviews by M. Koch-Müller and an anonymous reviewer.

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Received: 2015-11-16
Accepted: 2016-1-25
Published Online: 2016-4-30
Published in Print: 2016-5-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5625
Keywords for this article
Wadsleyite; hydrogen; ferric iron; polarized infrared spectroscopy; single-crystal X-ray diffraction; Mössbauer spectroscopy

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  19. Research Article
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