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EDXRF quantitative analysis of chromophore chemical elements in corundum samples
- Source :
- Analytical and bioanalytical chemistry. 395(7)
- Publication Year :
- 2009
-
Abstract
- Corundum is a crystalline form of aluminum oxide (Al2O 3) and is one of the rock-forming minerals. When aluminum oxide is pure, the mineral is colorless, but the presence of trace amounts of other elements such as iron, titanium, and chromium in the crystal lattice gives the typical colors (including blue, red, violet, pink, green, yellow, orange, gray, white, colorless, and black) of gemstone varieties. The starting point for our work is the quantitative evaluation of the concentration of chromophore chemical elements with a precision as good as possible to match the data obtained by different techniques as such as optical absorption photoluminescence. The aim is to give an interpretation of the absorption bands present in the NIR and visible ranges which do not involve intervalence charge transfer transitions (Fe2+ → Fe3+ and Fe2+ → Ti 4+), commonly considered responsible of the important features of the blue sapphire absorption spectra. So, we developed a method to evaluate as accurately as possible the autoabsorption effects and the secondary excitation effects which frequently are sources of relevant errors in the quantitative EDXRF analysis. © 2009 Springer-Verlag.
- Subjects :
- Photoluminescence
Absorption spectroscopy
Chemistry
Analytical chemistry
chemistry.chemical_element
Corundum, EDXRF, PL , Absorption bands
Corundum
Chromophore
engineering.material
Intervalence charge transfer
Biochemistry
Analytical Chemistry
Chromium
FIS/01 - FISICA SPERIMENTALE
engineering
Sapphire
Gemstone
Subjects
Details
- ISSN :
- 16182650
- Volume :
- 395
- Issue :
- 7
- Database :
- OpenAIRE
- Journal :
- Analytical and bioanalytical chemistry
- Accession number :
- edsair.doi.dedup.....41f53cc02455538bce9f9b863d4fe108