Cr^<3+>イオンを含む透明結晶化ガラスの光学的性質と作製

概要

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Transparent glass-ceramics containing ZnAl_2O_4: Cr^<3+> have been prepared by heat treatment of the glass with a composition of 20・ZnO20Al_2O_3・50SiO_2・ 6TiO_2・4Zr0_2・0.1Cr_2O_3 (molar ratio). X-ray diffraction analyses indicated that ZnAl_2O_4 microcrystals with a crystallite size of 5 to 30 nm precipitated in the specimens heat-treated at 850゜ to 1150℃. Cr^<3+> ions were incorporated into the ZnAl_2O_4 phase in the transparent glass-ceramics as demonstrated by the lattice constants determined from the X-ray diffraction. The emission due to the ^2E→^4A_2 transition was observed at room temperature for all the heat-treated specimens under the excitation of light at wavelength 507 nm from a Xe lamp, representing that Cr^<3+> ions replaced the Al^<3+> ions in the ZnAl_2O_4 microcrystals. The emission spectra were similar to that of single crystalline Cr^<3+>-doped spinel.
社団法人日本セラミックス協会の論文
1993-01-01