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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Formation of Co~(2+)-doped nanocrystals in La_2O _3-MgO-Al_2O_3-SiO_2 glass-ceramics
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Formation of Co~(2+)-doped nanocrystals in La_2O _3-MgO-Al_2O_3-SiO_2 glass-ceramics

机译：La_2O _3-MgO-Al_2O_3-SiO_2玻璃陶瓷中Co〜（2+）掺杂纳米晶的形成

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Transparent glass-ceramics were synthesized by heat-treatment of glass with a composition of 5La_2O_3-13.2MgO-28.8Al_2O _3-46SiO_2-4.5TiO_2-2.5ZrO_2-0.15CoO (LMAS) (wt.%). The activation energy of crystallization and the Avrami parameter for the LMAS glass were determined from the DTA curves at different heating rates. The most two intense bands of Raman spectrum of initial glass at ~ 810 cm-1 and ~ 900 cm~(-1) were connected with the presence of [SiO4] and [TiO4] tetrahedral, respectively. After heat-treated at 700°C/10 h+820°C/8 h, the intensity of the band for [TiO4] tetrahedral weakened, while an intensive band at ~ 800 cm -1 for the Ti-O bond appeared. Other bands were characteristics of high-silicate network and x(MgTi_2O_5)?y(Al _2TiO_5) polycrystals. The changes reflected phase separation after heat-treatment of the initial glass. The strong absorption band of glass-ceramics centered at 580 nm can be assigned to ~4A _2(~4F)→~4T_1(~4P) and the broad absorption band at 1100-1700 nm to ~4A_2(~4F)→~4T_1(~4F) transitions of tetrahedral coordinated Co~(2+) ion. Two broad emission bands, one was around 660 nm, the other was from 800 nm to 1050 nm, of glass-ceramics correspond to the ~4T_1(~4P) →~4A_2(~4F) and ~4T _1(~4P)→~4T_2(~4F) transitions of tetrahedral coordinated Co~(2+) ions. The absorption and emission features clearly demonstrated that Co~(2+) ions were incorporated into nanocrystals and located in tetrahedral sites.
机译：通过热处理具有5La_2O_3-13.2MgO-28.8Al_2O_3-46SiO_2-4.5TiO_2-2.5ZrO_2-0.15CoO（LMAS）（wt。％）的组成的玻璃来合成透明玻璃陶瓷。 LMAS玻璃的结晶活化能和Avrami参数由不同加热速率下的DTA曲线确定。初始玻璃在〜810 cm-1和〜900 cm〜（-1）的拉曼光谱的最大两个强带分别与四面体[SiO4]和[TiO4]存在。在700°C / 10 h + 820°C / 8 h进行热处理后，[TiO4]四面体的能带强度减弱，而出现Ti-O键的〜800 cm -1的强能带。其他能带是高硅酸盐网络和x（MgTi_2O_5）？y（Al _2TiO_5）多晶的特征。变化反映了初始玻璃热处理后的相分离。可以将以580 nm为中心的玻璃陶瓷的强吸收带指定为〜4A _2（〜4F）→〜4T_1（〜4P），将1100-1700 nm的宽吸收带指定为〜4A_2（〜4F）→〜4T_1四面体配位的Co〜（2+）离子的（〜4F）跃迁。玻璃陶瓷的两个宽发射带，一个在660 nm附近，另一个在800 nm至1050 nm之间，对应于〜4T_1（〜4P）→〜4A_2（〜4F）和〜4T _1（〜4P）→四面体配位Co〜（2+）离子的〜4T_2（〜4F）跃迁。吸收和发射特征清楚地表明，Co〜（2+）离子被掺入纳米晶体中并位于四面体位置。

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