Preparation And Properties Of Nanosized Lutetium,ytterbium,dysprosium And Nanosized Cerium Hydride Under Mild Conditions

Content:1.Cerium metals were hydrogenated at 45℃under normal pressure with different methods.The crystal structure of the samples was characterized by X-ray diffraction(XRD).The specific surface areas of the nanocrystal powders were measured by Brunaiuer-Emmett-Teller(BET) method with an automatic surface area and pore size analyzer.The crystal morphology and particle size were analyzed using a transmission electron microscopy(TEM).The results showed that the product is polycrystalline CeE_2.73,and the average specific surface areas of nanocrystal powder is about 20.4 m²/g,the particles have mono-dispersive cubic shape and the grain size is about 20 nm.The as-prepared black pyrophoric solid cerium hydride easily reacts with water and with acid,to liberate hydrogen. Furthermore,the chemical reactivity of the samples was also investigated.2.A simple and easy way was reported to prepare nanometric lutetium powder by thermal decomposition of organolutetium at 200℃under vacuum.The product was characterized by transmission electron micrographs(TEM),high resolution transmission electron micrographs(HRTEM) and BET method.The results showed that the product is lutetium crystal of hexagonal system;the average grain size is about 18 nm.3.Nanometric ytterbium and dysprosium powders were prepared by thermal decomposition of organometal intermediate under vacuum.The product was characterized by transmission electron micrographs(TEM),high resolution transmission electron micrographs(HRTEM) and BET method.Furthermore,the chemical reactivity of the samples was also investigated.