A theoretical study of the energetics and IR frequencies of hydroxyl defects in forsterite

J. Spencer Braithwaite, Kate Wright, C. Richard A. Catlow

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Computer modeling techniques have been used to study the structure and energetics of H defects in Mg2SiO4 forsterite and their infrared stretching frequencies. The calculated defect binding energies indicate that OH groups will combine with cation vacancies to form neutral defect complexes. Such defect clusters are stabilized by strong hydrogen bonding. Calculated infrared stretching frequencies for OH in different environments have been determined for the first time and show two distinct groups of frequencies. The values of these frequencies, together with their directional components, are compared to experimental measurements. This comparison shows that in pure forsterite, H defects will be associated with both Si and Mg vacancies, but will not occur as isolated OH groups, in line with the results from consideration of defect energetics.

Original languageEnglish
Pages (from-to)1-1 - 1-9
JournalJournal of Geophysical Research: Solid Earth
Volume108
Issue number6
DOIs
Publication statusPublished - 10 Jun 2003
Externally publishedYes

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