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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2017: 2.31

SCImago Journal Rank (SJR) 2017: 1.440
Source Normalized Impact per Paper (SNIP) 2017: 1.059

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1945-3027
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Volume 99, Issue 10

Issues

Letter. Identification of hydrogen defects linked to boron substitution in synthetic forsterite and natural olivine

Jannick Ingrin / István Kovács
  • Geological and Geophysical Institute of Hungary, Budapest, Stefánia Street 14, H-1143, Hungary
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Etienne Deloule / Etienne Balan
  • Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie, Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7590, IRD UMR 206, MNHN, F-75005, Paris, France
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Marc Blanchard
  • Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie, Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7590, IRD UMR 206, MNHN, F-75005, Paris, France
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/ Simon C. Kohn / Joerg Hermann
Published Online: 2014-10-14 | DOI: https://doi.org/10.2138/am-2014-5049

Abstract

Experimental and theoretical evidence for the coupled substitution of B and H in synthetic forsterite and a natural olivine is presented. The intensities of OH bands at 3704 cm-1 (//z), 3598 cm-1 (//x,y), and 3525 cm-1 (//x) in a heterogeneous B-doped synthetic forsterite crystal matches the zoning of B concentration measured by ion probe. The two anti-symmetric stretching vibrations of BO3 groups occur at 1301 cm-1 (//x) and 1207 cm-1 (//z) for the 10B and at 1256 and 1168 cm-1 for the 11B isotope. A microscopic model of the mixed (B,H) defect that accounts for experimental observations is obtained from quantum mechanical calculations. The BO3 group lies on the (O3-O1-O3) face of the vacant Si site and the H atom is bonded to the O2 atom at the remaining apex. The occurrence of the same OH bands associated with v3 BO3 vibrations in a natural olivine sample from Pakistan confirms the occurrence of this defect in nature. The three diagnostic OH bands can be used as a signature of H associated with boron substitution in olivine and forsterite, leading to a quantitative analysis of their contribution to H-defects.

Keywords: Olivine; forsterite; FTIR; hydrogen; H-defects; boron; 10B; 11B; BO3

About the article

Received: 2014-05-12

Accepted: 2014-06-08

Published Online: 2014-10-14

Published in Print: 2014-10-01


Citation Information: American Mineralogist, Volume 99, Issue 10, Pages 2138–2141, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2014-5049.

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© 2014 by Walter de Gruyter Berlin/Boston. This work is licensed under the MSA License. (view license)

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