运用燃烧法制备出单相(Y,Ce)_2Zr_2O_7纳米粉体,利用X射线衍射(X-ray Diffraction,XRD)与扫描电子显微镜(Scanning Electron Microscope,SEM)等分析表征手段,研究了Y/Ce比、燃烧剂、烧结温度对晶体结构和粉体形貌以及颗粒大小的影响.同...运用燃烧法制备出单相(Y,Ce)_2Zr_2O_7纳米粉体,利用X射线衍射(X-ray Diffraction,XRD)与扫描电子显微镜(Scanning Electron Microscope,SEM)等分析表征手段,研究了Y/Ce比、燃烧剂、烧结温度对晶体结构和粉体形貌以及颗粒大小的影响.同时,通过荧光光谱(Photoluminescence,PL)对Eu^(3+)离子掺杂的纳米粉体的发光性能进行了研究.结果表明,利用燃烧法可以快速高效地获得不同Y/Ce比的单相(Y,Ce)_2Zr_2O_7纳米粉体,Ce^(3+)离子的掺杂可以有效改善粉体分散性,且对晶体能带结构有一定影响,进而影响粉体的荧光性能.展开更多
Hematite (α-Fe2O3) nanopowder was synthesized from 0.1 mol·L-1 FeCl3 solution by sonochemical hydrolysis method, and characterized by X-ray diffraction (XRD), transmission electron micrograph (TEM), Fourier tran...Hematite (α-Fe2O3) nanopowder was synthesized from 0.1 mol·L-1 FeCl3 solution by sonochemical hydrolysis method, and characterized by X-ray diffraction (XRD), transmission electron micrograph (TEM), Fourier transform infrared (FTIR), Fourier transform Raman (FT-Raman) and X-ray photoelectron spectroscopy (XPS). The results showed that the spherical, well-dispersed α-Fe2O3 nanopowder was obtained with the average size of 20 nm. The possible mechanism for the formation of α-Fe2O3 nanoparticals was also discussed.展开更多
Four different hematite (-Fe2O3) nanopowders with various morphologi es have been synthesized in the presence of surfactant (HPC) via hydrothermal ro ute at 180 ℃, using four kinds of iron salts, Fe2(SO4)3, FeC2O4, F...Four different hematite (-Fe2O3) nanopowders with various morphologi es have been synthesized in the presence of surfactant (HPC) via hydrothermal ro ute at 180 ℃, using four kinds of iron salts, Fe2(SO4)3, FeC2O4, FeSO4 and (NH4 )3Fe(C2O4)3, as precursor materials. The products were characterized by means of X-ray diffraction (XRD), transmission electron micrograph (TEM), Fourier transf orm infrared spectroscopy (FTIR) and magnetization measurements. The hysteresis measurements show that the products exhibit weak ferromagnetic property at room temperature. It is concluded that the different precursor materials and the pres ence of the surfactant are important factors that exert significant effects on t he morphologies and magnetic properties of the products.展开更多
文摘运用燃烧法制备出单相(Y,Ce)_2Zr_2O_7纳米粉体,利用X射线衍射(X-ray Diffraction,XRD)与扫描电子显微镜(Scanning Electron Microscope,SEM)等分析表征手段,研究了Y/Ce比、燃烧剂、烧结温度对晶体结构和粉体形貌以及颗粒大小的影响.同时,通过荧光光谱(Photoluminescence,PL)对Eu^(3+)离子掺杂的纳米粉体的发光性能进行了研究.结果表明,利用燃烧法可以快速高效地获得不同Y/Ce比的单相(Y,Ce)_2Zr_2O_7纳米粉体,Ce^(3+)离子的掺杂可以有效改善粉体分散性,且对晶体能带结构有一定影响,进而影响粉体的荧光性能.
文摘Hematite (α-Fe2O3) nanopowder was synthesized from 0.1 mol·L-1 FeCl3 solution by sonochemical hydrolysis method, and characterized by X-ray diffraction (XRD), transmission electron micrograph (TEM), Fourier transform infrared (FTIR), Fourier transform Raman (FT-Raman) and X-ray photoelectron spectroscopy (XPS). The results showed that the spherical, well-dispersed α-Fe2O3 nanopowder was obtained with the average size of 20 nm. The possible mechanism for the formation of α-Fe2O3 nanoparticals was also discussed.
文摘Four different hematite (-Fe2O3) nanopowders with various morphologi es have been synthesized in the presence of surfactant (HPC) via hydrothermal ro ute at 180 ℃, using four kinds of iron salts, Fe2(SO4)3, FeC2O4, FeSO4 and (NH4 )3Fe(C2O4)3, as precursor materials. The products were characterized by means of X-ray diffraction (XRD), transmission electron micrograph (TEM), Fourier transf orm infrared spectroscopy (FTIR) and magnetization measurements. The hysteresis measurements show that the products exhibit weak ferromagnetic property at room temperature. It is concluded that the different precursor materials and the pres ence of the surfactant are important factors that exert significant effects on t he morphologies and magnetic properties of the products.
