Publication: Gemological modification of local natural gemstones by ion beams
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Issued Date
2009
Resource Type
File Type
application/pdf
ISSN
2578972
Other identifier(s)
2-s2.0-67349212893
Rights Holder(s)
มหาวิทยาลัยศรีนครินทรวิโรฒ
Bibliographic Citation
Surface and Coatings Technology. Vol 203, No.17-18 (2009), p.2788-2792
Suggested Citation
Intarasiri S., Bootkul D., Yu L.D., Kamwanna T., Singkarat S., Vilaithong T. Gemological modification of local natural gemstones by ion beams. Surface and Coatings Technology. Vol 203, No.17-18 (2009), p.2788-2792. doi:10.1016/j.surfcoat.2009.02.122 Retrieved from: https://hdl.handle.net/20.500.14740/6387
Abstract
Ion implantation was applied as an effective method to gemological modification of Thai local natural corundum including sapphire and ruby for enhancement of the essential qualities of the gemstones. Oxygen and nitrogen ions at medium and low energies to various fluences were implanted to the natural gemstones. The heavy ion irradiation modifies the color to desirable colors and improves the color distribution, transmission and lustre. These modifications lead to the improvement of quality of gemstones and thus the market value. Possible mechanisms of these modifications have been proposed. The main cause for these modifications could be the changes in oxidation states of impurity metals, induction of charge transfer from one metal cation to other and the production of color centres. © 2009 Elsevier B.V. All rights reserved.
Subject(s)
Color distributions
Fluences
Gemological modification
Gemstone
Heavy ion irradiations
Impurity metals
Low energies
Market values
Metal cations
Nitrogen ions
Oxidation state
Charge transfer
Chemical modification
Color
Hematite
Ion bombardment
Ion exchange
Ion implantation
Oxygen
Ruby
Sapphire
Corundum
Fluences
Gemological modification
Gemstone
Heavy ion irradiations
Impurity metals
Low energies
Market values
Metal cations
Nitrogen ions
Oxidation state
Charge transfer
Chemical modification
Color
Hematite
Ion bombardment
Ion exchange
Ion implantation
Oxygen
Ruby
Sapphire
Corundum