共搜索到678条信息,每页显示10条信息,共68页。用时:0小时0分0秒406毫秒
共沉淀法制备Nd3+:Y2O3透明陶瓷 张剑平1,罗军明1,邓莉萍1 (1.南昌航空大学材料科学与工程学院,南昌,330063) 摘要:以Y2O3为基质材料,掺杂不同含量的Nd3+添加PEG和(NH4)2SO4为分散剂,采用共沉淀法制备出性能良好的Nd3+:Y2O3纳米粉.对前驱体和不同温度下煅烧后的粉体进行差热热重,X射线衍射,比表面积和透射电镜等分析.结果表明,前驱体产物为Y2(OH)5(NO3)·nH2O时,Nd3+完全固溶于Y2O3的立方晶格中,Nd3+:Y2O3粉体大小均匀,近似球形.随着煅烧温度的升高,颗粒逐渐长大,900℃煅烧2h后颗粒尺寸约为40~60nm;粉体在1700℃和真空度为1×10-3Pa条件下烧结6h得到的Nd3+:Y2O3透明陶瓷的透光率接近78%. 关键词:共沉淀法; Nd3+:Y2O3; 透明陶瓷; 透光率; co-precipitation......
......
solution. Key words: thermal barrier coatings; nanopowder; rare-earth co-doped zirconia; alcohol/water solvent; reverse co-precipitation 4.0%~4.5%Y2O3-ZrO2(YSZ,摩尔分数)是目前广泛应用的热障涂层(TBCs)材料.当其工作温度长期高于1 200... of Powder Metallurgy, Central South University, Changsha 410083, China) Abstract: 0.6%La2O3-4.473%Y2O3-ZrO2(LaYSZ, mole fraction) composite ceramic nanopowder was synthesized by reverse co......
January 2011; accepted 22 September 2011 Abstract: Lutetium oxide nanocrystals codoped with Tm3+ and Yb3+ were synthesized by the reverse-like co-precipitation method, using ammonium hydrogen carbonate... of the upconversion luminescence is suggested to be the consequence of reducing number of OH- groups and the enlarged nanocrystal size. Key words: Lu2O3:Yb3+,Tm3+ nanocrystal; co-precipitation method......
-Cr-V alloy powders were prepared by co-precipitation and thermal decomposition method. X-ray diffraction (XRD) and infrared spectroscopy (IR) were used to analyze phase and crystal structure... words: co-precipitation and thermal decomposition method; superfine powders; substitutional solid solution; spherical-like 超细粉末是20世纪发展起来的新型材料,通常泛指粒度在1~100 nm范围内的微小固体颗粒[1].伴随超细化产生的表面效应,量子尺寸效应和宏观量子隧道效应......
Luminescent characterization of rare earth Dy3+ ion doped TiO2 prepared by simple chemical co-precipitation methodMohamed Zikriya1,C.G.Renuka11. Department of Physics, Bangalore University摘 要:Pure and rare-earth ion (Dy3+) doped TiO2 nanomaterials were prepared through a chemical coprecipitation method. The chemical composition, micro structure......
Luminescent characterization of rare earth Dy3+ ion doped TiO2 prepared by simple chemical co-precipitation methodMohamed Zikriya1,C.G.Renuka11. Department of Physics, Bangalore University摘 要:Pure and rare-earth ion (Dy3+) doped TiO2 nanomaterials were prepared through a chemical coprecipitation method. The chemical composition, micro structure......
value was obtained. Based on the thermodynamics analysis results, the precipitation mechanism was also analyzed. The results show that pH value is a very important factor which determines the co...-doped tin oxide; thermodynamic analysis; co-precipitation 湿法共沉淀制备锑掺杂纳米二氧化锡的方法通常是将一定比例的SnCl4和SbCl3的混合溶液和氨水加入盛有去离子水的容器中,在适当的反应温度,反应时间,pH值及剧烈搅拌下得到锡锑氢氧化物前驱体;然后,在一定温度和气氛下将前驱体煅烧得到均匀锑掺杂二......
, FU Bing, ZHU Li-ping, CHEN Xue-yu, YANG Jin-yu. Co-precipitation synthesis and optical properties of Eu3+ doped La3PO7 phosphors[J]. The Chinese Journal of Nonferrous Metals, 2017, 27(5): 974-980. [22...-conversion luminescence properties; co-precipitation method; color purity; luminescence mechanism Foundation item: Projects(213610007, 51776046) supported by the Natural Science Foundation of China......
ultrasonic co-precipitation method (Sample B) or co-precipitation method (Sample A). The crystal structure and particle size distribution of the prepared samples were examined by X-ray diffraction (XRD... (308 mA·h/g) of Sample B is 25 mA·h/g higher than that of Sample A (283 mA·h/g). Key words: Al/Co co-doped α-Ni(OH)2; ultrasonic co-precipitation method; proton diffusion coefficient; charge-transfer......