Titanium local structure in tektite probed by X-ray absorption fine structure spectroscopy

Ling Wang, Akira Yoshiasa, Maki Okube, Takashi Takeda

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The local structure of titanium in tektites from six strewn fields was studied by Ti K-edge X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) in order to provide quantitative data on Ti-O distance and Ti coordination number. The titanium in tektites possessed different coordination environment types. XANES spectra patterns revealed resemblance to high-temperature TiO2-SiO2 glass and TiO2 anatase. All samples showed that the valence of Ti is 4+. Based on the Ti-O distances, coordination numbers and radial distribution function determined by EXAFS analyses, the tektites were classified into three types: type I, Ti occupies a four-coordinated tetrahedral site with Ti-O distances of 1.84-1.79 Å; type II, Ti occupies a five-coordinated trigonal bipyramidal or tetragonal pyramidal site with Ti-O distances of 1.92-1.89 Å; type III, Ti occupies a six-coordinated octahedral site with Ti-O distances of 2.00-1.96 Å. Although Ti occupies the TiO6 octahedral site in most titanium minerals under ambient conditions, some tektites have four-and five-coordinated Ti. This study indicated that the local structure of Ti might change in impact events and the following stages.

Original languageEnglish
Pages (from-to)885-890
Number of pages6
JournalJournal of Synchrotron Radiation
Volume18
Issue number6
DOIs
Publication statusPublished - 2011 Nov

Keywords

  • XAFS
  • local structure
  • tektite
  • titanium

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Instrumentation

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