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Structure,room-temperature magnetic and optical properties of Mn-doped TiO_2 nano powders prepared by the sol-gel process
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作者 丁芃 刘发民 +4 位作者 周传仓 钟文武 张嬛 蔡鲁刚 曾乐贵 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第11期667-672,共6页
TiO2 nano powders with Mn concentration of 0 at%-12 at% were synthesized by the sol-gel process, and were annealed at 500 ℃ and 800 ℃ in air for 2 hrs. X-ray diffraction (XRD) measurements indicate that the Mn-TiO... TiO2 nano powders with Mn concentration of 0 at%-12 at% were synthesized by the sol-gel process, and were annealed at 500 ℃ and 800 ℃ in air for 2 hrs. X-ray diffraction (XRD) measurements indicate that the Mn-TiO2 nano powders with Mn concentration of 1 at% and 2 at% annealed at 500 and 800 ℃ are of pure anatase and rutile, respectively. The scanning electron microscope (SEM) observations reveal that the crystal grain size increases with the annealing temperature, and the high resolution transmission electron microscopy (HRTEM) investigations further indicate that the samples are well crystallized, confirming that Mn has doped into the TiO2 crystal lattice effectively. The room temperature ferromagnetism, which could be explained within the scope of the bound magnetic polaron (BMP) theory, is detected in the Mn-TiO2 samples with Mn concentration of 2 at%, and the magnetization of the powders annealed at 500 ℃ is stronger than that of the sample treated at 800 ℃. The UV-VIS diffuse reflectance spectra results demonstrate that the absorption of the TiO2 powders could be enlarged by the enhanced trapped electron absorption caused by Mn doping. 展开更多
关键词 Mn-doped tio2 nano powders sol-gel process room-temperature magnetic properties diffuse reflectance spectra
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In-situ Preparation of Al/TiAl_3(P) Composite by Direct Reaction between Molten Al and TiO_2 Powder
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作者 Yuyong CHEN Ziyong CHEN Qu SHU and Geying AN(National Defense Precision Hot Processing Lab., Harbin Institute of Technology Harbin 150006, China) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1998年第6期569-570,共2页
TiAl3 particle reinforced pure Al composite has been made by direct reaction among molten Al, TiO2 and a flux. The composite exhibits high Synthetically properties. The strength and hardness are higher than those of p... TiAl3 particle reinforced pure Al composite has been made by direct reaction among molten Al, TiO2 and a flux. The composite exhibits high Synthetically properties. The strength and hardness are higher than those of pure Al matrix by 71.5% and 134% respectively However, the elongation is 20.36%, slightly lower than that of the Al matrix. 展开更多
关键词 tio TiAl In-situ Preparation of Al/TiAl3 Composite by Direct Reaction between Molten Al and tio2 Powder
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Emulsive properties of nanometer TiO_2 ultrafine powder in oil-water system
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作者 WANG BaohuiDepartment of Petrochemical Engineering and Center of Analysis and Testing, Daqing Petroleum Institute, Anda 151400, China 《Chinese Science Bulletin》 SCIE EI CAS 1997年第21期1847-1848,共2页
INVESTIGAORS recognized the role of finely divided insoluble solid particles in stabilizing oil-water emulsions in the 1920s. The work has been extensively done since the 1980s. Butthe studies only focused on particle... INVESTIGAORS recognized the role of finely divided insoluble solid particles in stabilizing oil-water emulsions in the 1920s. The work has been extensively done since the 1980s. Butthe studies only focused on particles with the parameter up to micrometer size rather than thoseof nanometer size. In this letter, emulsive properties, including the type, ability and mecha- 展开更多
关键词 tio Emulsive properties of nanometer tio2 ultrafine powder in oil-water system
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