Temperature behavior of the 6.05-eV band in optical absorption spectra of oxygen-deficient corundum / Vaǐnshteǐn I.A., Kortov V.S. // Physics of the Solid State. - 2000. - V. 42, l. 7. - P. 1259-1265.

ISSN:

10637834

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Article

Abstract:

The effect of temperature on the 6.05-eV absorption band in α-Al2O3 has been studied in the 80-515 K region. The data obtained are analyzed in terms of a one-coordinate model with strong electron-phonon coupling. This band is shown to be formed by two peaks at 5.91 and 6.22 eV (Υ = 293 K) originating from absorption at the F+ and F centers, respectively. An analysis of the experimental temperature dependences has allowed us to calculate the energies of effective phonons responsible for the broadening and shift of the peaks. The energies calculated agree with the data obtained in other studies and lie in the region of corundum acousticvibration frequencies. The Huang-Rhys factors have been evaluated for both centers and found to be close to the estimates made by other authors. The results are discussed in detail and compared with independent data on optical absorption and luminescence of anion centers in colored and irradiated α-Al2O3 single crystals. © 2000 MAIK "Nauka/Interperiodica".

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Affiliations	Ural State Technical University, ul. Mira 19, Yekaterinburg, 620002, Russian Federation
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Correspondence Address	Vaǐnshteǐn, I.A.; Ural State Technical University, ul. Mira 19, Yekaterinburg, 620002, Russian Federation; email: wia@dpt.ustu.ru
Language of Original Document	English
Abbreviated Source Title	Phys. Solid State
Source	Scopus