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

Jannick Ingrin, István Kovács, Etienne Deloule, Etienne Balan, Marc Blanchard, Simon C. Kohn, Joerg Hermann

Research output: Contribution to journalArticle

17 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)2138-2141
Number of pages4
JournalAmerican Mineralogist
Volume99
Issue number10
DOIs
Publication statusPublished - Oct 1 2014

Keywords

  • B
  • B
  • BO
  • FTIR
  • H-defects
  • Olivine
  • boron
  • forsterite
  • hydrogen

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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