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Optical absorption of Co2+ in gel-derived aluminosilicate glass-ceramics

✍ Scribed by Xiulan Duan; Duorong Yuan; Xiufeng Cheng; Xinqiang Wang

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
130 KB
Volume
28
Category
Article
ISSN
0925-3467

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✦ Synopsis

Pure and Co 2+ -doped aluminosilicate gels were prepared by the sol-gel method from two different aluminum salts, aluminum-isopropoxide and aluminum nitrate, and heat-treated at 40-1200 °C. Visible and near-infrared (NIR) absorption spectra of the heated samples were studied. When the heat-treatment temperature was 1100 °C, Co 2+ -doped aluminosilicate samples, obtained by using aluminum-iso-propoxide, crystallized to Al 2 O 3 nanocrystals and exhibited a broad absorption band in the range of 1200-1600 nm, which is characteristic of tetrahedral Co 2+ ions in crystals. The existence of the broad absorption band has allowed us to consider this kind of material as possible candidate for passive Q-switched materials in the NIR region. While the sample prepared from aluminum nitrate was amorphous when heated to 1200 °C.

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