TQ171.112 2003053903Er<sup>3+</sup>和Yb<sup>3+</sup>共掺碲酸盐玻璃的光谱性质=Spectroscopicproperties of Er<sup>3+</sup> and Yb<sup>3+</sup> codoped tellurite glasses[刊,...TQ171.112 2003053903Er<sup>3+</sup>和Yb<sup>3+</sup>共掺碲酸盐玻璃的光谱性质=Spectroscopicproperties of Er<sup>3+</sup> and Yb<sup>3+</sup> codoped tellurite glasses[刊,中]/杨建虎（中科院上海光机所.上海（201800））,戴世勋…//光学学报.—2003,23（2）.—210-215研究了Er<sup>3+</sup>和Yb<sup>3+</sup>共掺碲酸盐玻璃的吸收和荧光光谱性质,分析了碲酸盐玻璃中Er<sup>3+</sup>的上转换发光机制,应用Judd-Ofelt理论计算了玻璃的强度参量Ω<sub>t</sub>（t=2,4,6）,分别为Ω<sub>2</sub>=4.74×10<sup>-20</sup>cm<sup>2</sup>,Ω<sub>4</sub>=1.46×10<sup>-20</sup>展开更多
Removal of brittle materials in the brittle or ductile mode inevitably causes damaged or strained surface layers containing cracks, scratches or dislocations. Within elastic deformation, the arrangement of each atom c...Removal of brittle materials in the brittle or ductile mode inevitably causes damaged or strained surface layers containing cracks, scratches or dislocations. Within elastic deformation, the arrangement of each atom can be recovered back to its original position without any defects introduced. Based on surface hydroxylation and chemisorption theory, material removal mechanism of quartz glass in the elastic mode is analyzed to obtain defect-free surface. Elastic contact condition between nanoparticle and quartz glass surface is confirmed from the Hertz contact theory model. Atoms on the quartz glass surface are removed by chemical bond generated by impact reaction in the elastic mode, so no defects are generated without mechanical process. Experiment was conducted on a numerically controlled system for nanoparticle jet polishing, and one flat quartz glass was polished in the elastic mode. Results show that scratches on the sample surface are completely removed away with no mechanical defects introduced, and microroughness(Ra) is decreased from 1.23 nm to 0.47 nm. Functional group Ce — O — Si on ceria nanoparticles after polishing was detected directly and indirectly by FTIR, XRD and XPS spectra analysis from which the chemical impact reaction is validated.展开更多
文摘TQ171.112 2003053903Er<sup>3+</sup>和Yb<sup>3+</sup>共掺碲酸盐玻璃的光谱性质=Spectroscopicproperties of Er<sup>3+</sup> and Yb<sup>3+</sup> codoped tellurite glasses[刊,中]/杨建虎（中科院上海光机所.上海（201800））,戴世勋…//光学学报.—2003,23（2）.—210-215研究了Er<sup>3+</sup>和Yb<sup>3+</sup>共掺碲酸盐玻璃的吸收和荧光光谱性质,分析了碲酸盐玻璃中Er<sup>3+</sup>的上转换发光机制,应用Judd-Ofelt理论计算了玻璃的强度参量Ω<sub>t</sub>（t=2,4,6）,分别为Ω<sub>2</sub>=4.74×10<sup>-20</sup>cm<sup>2</sup>,Ω<sub>4</sub>=1.46×10<sup>-20</sup>
基金Projects(51305450,51275521)supported by the National Natural Science Foundation of China
文摘Removal of brittle materials in the brittle or ductile mode inevitably causes damaged or strained surface layers containing cracks, scratches or dislocations. Within elastic deformation, the arrangement of each atom can be recovered back to its original position without any defects introduced. Based on surface hydroxylation and chemisorption theory, material removal mechanism of quartz glass in the elastic mode is analyzed to obtain defect-free surface. Elastic contact condition between nanoparticle and quartz glass surface is confirmed from the Hertz contact theory model. Atoms on the quartz glass surface are removed by chemical bond generated by impact reaction in the elastic mode, so no defects are generated without mechanical process. Experiment was conducted on a numerically controlled system for nanoparticle jet polishing, and one flat quartz glass was polished in the elastic mode. Results show that scratches on the sample surface are completely removed away with no mechanical defects introduced, and microroughness(Ra) is decreased from 1.23 nm to 0.47 nm. Functional group Ce — O — Si on ceria nanoparticles after polishing was detected directly and indirectly by FTIR, XRD and XPS spectra analysis from which the chemical impact reaction is validated.
