Gemological modification of local natural gemstones by ion beams

Intarasiri, S.; Bootkul, D.; Yu, L.D.; Kamwanna, T.; Singkarat, S.; Vilaithong, T.

doi:10.1016/j.surfcoat.2009.02.122

Cited by 12 publications

(2 citation statements)

References 12 publications

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“…6 Many interesting properties are closely related to point defects and impurities introduced in Al 2 O 3 . [7][8][9][10][11] Ion implantation in alumina has been used to improve its optical and mechanical properties with applications in optics, optoelectronic devices, photonics, and tooling and, more recently, ion beam modification of sapphire seems to be an open field of research in the gemology industry. 9,10 For example, 7 Al 2 O 3 is a potential candidate to be used in emissive optical devices, exploiting the electronic properties of isolated impurities.…”

Section: Introductionmentioning

confidence: 99%

Site localization of Cd impurities in sapphire

et al. 2012

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By combining first-principles electronic structure calculations and existing time-differential γ -γ perturbedangular-correlation experiments we studied the site localization, the local environment, and the electronic structure of Cd impurities in sapphire (α-Al 2 O 3 ) single crystals in different charged states. The ab initio calculations were performed with the full-potential augmented plane wave plus local orbitals method and the projector augmented wave method. Comparing the calculated electric-field-gradient tensor at the Cd nuclei in the α-Al 2 O 3 host lattice and the corresponding available experimental values, we have seen that it is equally possible for Cd to replace an Al atom (in a negative charge state) or to be placed in an interstitial site (in a neutral charge state). To finally address the issue of the Cd impurity localization, we performed formation energy calculations. These results have shown that Cd placed in the substitutional Al site, in the negatively charged state, is the most probable configuration.

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Section: Introductionmentioning

confidence: 99%

Site localization of Cd impurities in sapphire

et al. 2012

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“…Many studies have dealt with understanding basic and applied aspects of ion beam modifications of sapphire but not many have focussed on developing industry-ready technology. We have reported recently that ion beam irradiation has potentials to enhance several gems in corundum family [12].…”

Section: Introductionmentioning

confidence: 99%