碲化镉粉的液相还原与氢处理法制备研究

摘要

The uniformly mixing precursor powders at nanoscale size was prepared by in-situ reaction which used cadmium chloride and tellurium dioxide as raw materials,and hydrazine hydrate as a reducing agent and a com-plexing agent.The cadmium telluride was obtained by hydrogen reduction of precursor powders during 110-400℃.Moreover,the evolution of phases and microstructures were investigated by XRD,TG,SEM etc.The results show that during the preparation of precursor the tetravalent tellurium was changed to elemental telluri-um at nanoscale size,while the ions of cadmium precipitated in the form of 2-5μm Cd(N2 H4 )x Cl2 complexes. Furthermore,the elemental tellurium and Cd(N2 H4 )x Cl2 dispersed uniformly.The single phase cadmium tellu-ride can be obtained from the precursor treated by hydrogen at 400℃ and the precursor was prepared with cad-mium chloride and tellurium dioxide mixed with a molar ratio 1∶1 .%以氯化镉和二氧化碲为原料，水合肼为还原剂和络合剂，原位制备出了纳米级混合均匀的前驱体粉末，在110~400℃氢气还原制备了碲化镉粉末，并结合X射线衍射(XRD)、热重分析(TG)、扫描电子显微镜(SEM)等分析手段研究了上述过程中物相和微观结构演变。结果表明，制备前驱体过程中四价碲被水合肼还原成纳米级的碲单质，同时镉离子以2~5μm Cd(N2 H4)x Cl2配合物的形式沉淀析出，且单质碲和Cd(N2 H4)x Cl2均匀分散；当氯化镉和二氧化碲按摩尔比1∶1进行混合时得到的前驱体经400℃氢处理后，可获得单一相组成的碲化镉粉末。