Nanocrystalline TiO_(2) powder was prepared by sol-gel process.The structures of the as-prepared and the TiO_(2) powder heat-treated at different temperatures were studied by thermogravimetric analyzer,differential th...Nanocrystalline TiO_(2) powder was prepared by sol-gel process.The structures of the as-prepared and the TiO_(2) powder heat-treated at different temperatures were studied by thermogravimetric analyzer,differential thermal analysis,x-ray diffraction,and Raman spectra.As the powder was heat-treated at 350℃,it turned into tetragonal anatase structure.A structural transformation from anatase to rutile type occurred and the grains of the powder grew drastically when the powder was heat-treated at above 550℃.The structural transformation from anatase to rutile type completed at 750℃.The Raman spectra of TiO_(2) nanocrystalline powder were also studied.展开更多
The structure and optic properties of PbTiO\-3 nanocrystalline powder/epoxy composites are studied under different electric fields during solidification. X\|ray diffraction (XRD), scattered light, ultraviolet optic ab...The structure and optic properties of PbTiO\-3 nanocrystalline powder/epoxy composites are studied under different electric fields during solidification. X\|ray diffraction (XRD), scattered light, ultraviolet optic absorption and second harmonic generation (SHG) of the composites are measured. Results show that the electric field has a great effect on the properties of nanocomposites. The mechanism of electric field production is discussed.展开更多
Recently, much attention has been paid to the nonlinear properties because of theirpotential uses in optical functional devices, such as optical modulators, optical switches,fiber laser, and optical memories. Since Ja...Recently, much attention has been paid to the nonlinear properties because of theirpotential uses in optical functional devices, such as optical modulators, optical switches,fiber laser, and optical memories. Since Jain and Lind first reported high nonlinear opticalproperties of CdS<sub>x</sub>Se<sub>1-x</sub> quantum-dot doped glasses in 1983, nanometer semiconductormicrocrystals within glass matrix have been widely studied in which the electron and holeare quantum-confined by a deep potential well.展开更多
基金Supported by the Natural Science Foundation of Guangdong Province of China under Grant No.930222"211"Science Foundation of Zhongshan University.
文摘Nanocrystalline TiO_(2) powder was prepared by sol-gel process.The structures of the as-prepared and the TiO_(2) powder heat-treated at different temperatures were studied by thermogravimetric analyzer,differential thermal analysis,x-ray diffraction,and Raman spectra.As the powder was heat-treated at 350℃,it turned into tetragonal anatase structure.A structural transformation from anatase to rutile type occurred and the grains of the powder grew drastically when the powder was heat-treated at above 550℃.The structural transformation from anatase to rutile type completed at 750℃.The Raman spectra of TiO_(2) nanocrystalline powder were also studied.
文摘The structure and optic properties of PbTiO\-3 nanocrystalline powder/epoxy composites are studied under different electric fields during solidification. X\|ray diffraction (XRD), scattered light, ultraviolet optic absorption and second harmonic generation (SHG) of the composites are measured. Results show that the electric field has a great effect on the properties of nanocomposites. The mechanism of electric field production is discussed.
基金Guangdong Provincial Natural Science Foundation and Postdoctoral Science Foundation of Guangdong.
文摘Recently, much attention has been paid to the nonlinear properties because of theirpotential uses in optical functional devices, such as optical modulators, optical switches,fiber laser, and optical memories. Since Jain and Lind first reported high nonlinear opticalproperties of CdS<sub>x</sub>Se<sub>1-x</sub> quantum-dot doped glasses in 1983, nanometer semiconductormicrocrystals within glass matrix have been widely studied in which the electron and holeare quantum-confined by a deep potential well.
