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- Title
COLORING OF TOPAZ BY COATING AND DIFFUSION PROCESSES: AN X-RAY PHOTOEMISSION STUDY OF WHAT HAPPENS BENEATH THE SURFACE.
- Authors
Gabasch, Harald; Klauser, Frederik; Bertel, Erminald; Rauch, Thomas
- Abstract
Surface-treated topaz has become a viable alternative to topaz colored by irradiation. Unlike irradiation, which modifies the entire gemstone, coloration by chemical modification is limited to the near-surface region. The treatment techniques are well established, but less is known about how the processes involved create the desired appearance. In this study, X-ray photoemission spectroscopy in combination with sputter depth profiling proved successful in characterizing two fundamentally different coloration mechanisms of chemically treated topaz: colored coatings and diffusion-induced coloration. INSET: BOX A: XPS ANALYSIS.
- Subjects
TOPAZ; IRRADIATION; X-rays; PHOTOEMISSION; GEMS &; precious stones; SURFACE coatings
- Publication
Gems & Gemology, 2008, Vol 44, Issue 2, p148
- ISSN
0016-626X
- Publication type
Article
- DOI
10.5741/GEMS.44.2.148