ZnAl_2O_4:Cr^<3+>含有透明結晶化ガラスの微細構造と光吸収スペクトル

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The microstructure and optical properties of transparent glass-ceramics containing ZnAl_2O_4:Cr^<3+> have been examined by using X-ray diffraction, transmission electron microscopy and optical absorption measurement. The glass-ceramics were prepared by the heat teratment of glass with 20ZnO・20Al_2O_3・50SiO_2・6TiO_2・4ZrO_2・0.1Cr_2O_3 composition (mol %). ZnAl_2O_4 and ZrTiO_4 precipitated from the glass when the heat traetment temperature was above 850℃. The heat treatment below 1100℃ successfully yielded the transparent glass-ceramics. The crystallite size of ZnAl_2O_4 increased from 5 nm to 20 nm as the heat treatment temperature was increased rom 850℃ to 1100℃. At 1100℃, the ZnAl_2O_4 crystallites precipitated as a cubic form. The optical absorption spectra at toom temperature indicate that the absorption due to the 4A_2→4T_2 transition, which corresponds to the 10 Dq, takes place at the wavelength of 650 nm for the glass and at 557 to 530 nm for the glass-ceramics. This fact suggests that the ligand field strength for the Cr^3+ ion sites increases as the Cr^3+ ions are incorporated into ZnAl_2O_4. The wavelength of the absorption band due to the 4A_2→4T_2 transition increases monotonically with an increase in crystallite size. This phenomenon is explaned by taking into account the surface state of fine ZnAl_2O_4 : Cr^3+ particles and the variation of the concentration of Cr^3+ ions in ZnAl\2O_4 : Cr^3+ with heat treatment temperature.
1993-05-15

ZnAl_2O_4:Cr^<3+>含有透明結晶化ガラスの微細構造と光吸収スペクトル

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