| Preparation and Optical Properties of Transparent Glass-Ceramics Containing Cobalt(II) Ions. (1998) | |||||||||
Abstract | |||||||||
| Transparent glass-ceramics containing ZnAl2O4:Co(2+) and LiGa5O8:Co(2+) crystallites have been prepared by heat treatment of glasses in the zinc aluminosilicate and lithium gallate silicate systems, respectively. Crystalline LiGa5O8 was already precipitated in an as-prepared specimen, while ZnAl2O4:Co(2+) precipitated from the glass upon heat treatment. The crystallite size varies from about 5 to 20 nm with increasing heat treatment temperature for both systems, and glass-ceramics containing crystallites of less than about 10 nm are transparent. The low-temperature optical absorption and emission spectra are compared with those of single crystals, indicating that almost all of the Co(2+) ions replace Zn(2+) ions in the ZnAl2O4 system, while some of the Co(2+) ions are incorporated into the LiGa5O8 system, although the amount of Co(2+) which remains in the glass matrix is rather large in the latter system. | |||||||||
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