R-line luminescence from trace amounts of Cr3+ in aluminum oxide and its dependence on sample hydration

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12 Scopus citations

Abstract

The R-line luminescence is observed in the Raman spectra of α- and γ-Al2O3 with chromium concentrations of less than 1 ppm. The same signals were previously used to monitor the setting reaction of dental cements. With laser excitation <690 nm, the R-line luminescence can be observed in the optical spectra of most commercial products containing α-Al2O3. It is found that the intensities of R-line signals are related to the degree of hydration of the α-Al2O3 sample, which can be explained by the formation of additional octahedral sites for Cr3+ near the sample surface involving oxygen atoms from the Al2O3 matrix and from absorbed water molecules.

Original languageEnglish (US)
Pages (from-to)1055-1058
Number of pages4
JournalApplied Spectroscopy
Volume56
Issue number8
DOIs
StatePublished - Aug 2002
Externally publishedYes

Keywords

  • Aluminum oxide
  • Dehydration
  • Luminescence
  • R-lines
  • Rehydration

ASJC Scopus subject areas

  • Instrumentation
  • Spectroscopy

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