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A first principles study on optical transparency mechanism in Dy doped alpha-SiAlON ceramics
KTH, School of Biotechnology (BIO), Theoretical Chemistry.
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2009 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 106, no 9Article in journal (Refereed) Published
Abstract [en]

Dy doped alpha-SiAlON ceramics prepared by the hot-pressing method show a high optical transmittance value, >70%, in the infrared region of 1.5-4.5 mu m. First principles calculations have been carried out to reveal the underlying transparency mechanism. It is found that the valence shell of doped Dy atoms interacts strongly with the doping states of alpha-SiAlON, resulting in the increase in the optical gap from 0.4 to 1.1 eV, which suppresses the photoabsorption in the wavelength region longer than 1.0 mu m and leads to the good transparency property. The calculated optical transmission spectra are in good agreement with the corresponding experiments.

Place, publisher, year, edition, pages
2009. Vol. 106, no 9
Keyword [en]
phase-transformations, kinetics, calcium
Identifiers
URN: urn:nbn:se:kth:diva-19026DOI: 10.1063/1.3253727ISI: 000272555700030Scopus ID: 2-s2.0-70450269245OAI: oai:DiVA.org:kth-19026DiVA: diva2:337073
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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