摘要
以CeCl_3·7H_2O作为铈源、碳酸氢铵作为沉淀剂、乙二胺作为络合剂,采用水热法制备了三角星状二氧化铈微结构。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱仪(XPS)、拉曼光谱(Raman)、荧光分光光度计(PL)、紫外可见近红外分光光度计(UV-Vis)和综合物性测量系统(PPMS)等对此CeO_2样品的晶相、形貌、表面化学组分、缺陷、光学和磁学性质做了相关研究,分析并提出了三角星状二氧化铈微结构生长机理。结果表明,制备的Ce O_2具有室温铁磁性,其室温铁磁性与样品中Ce^(3+)和氧空位有关。样品对波长小于400 nm的紫外光有很强的吸收,但对波长大于400 nm的可见光有很好的透过性,这表明样品能很好的用做紫外吸收剂。
Trigonometry-star-like CeO_2 microstructures were successfully synthesized by hydrothermal method using CeCl_3·7H_2O as cerium source,NH_4HCO_3 as precipitant and ethylenediamine as the complexing agent. The crystal phases,morphology,surface chemical component,defects,optical and magnetic properties of the as-synthesized CeO_2 were studied by X-ray diffraction( XRD),scanning electron microscope( SEM), X-ray photoelectron spectroscopy( XPS), Raman spectrometer( Raman),fluorescence spectrophotometer( PL),Ultraviolet-visible-near-infrared spectrophotometer( UV-Vis) and comprehensive physical measurement system( PPMS). Growth mechanism of trigonometry-star-like CeO_2 microstructures was put forward. The results show that the as-synthesized trigonometry-star-like CeO_2 microstructures has room temperature ferromagnetism,which is likely associated with Ce^(3+)and oxygen vacancies. The as-synthesized sample has a strong absorption to ultraviolet light,however,but it has good permeability for visible light. This indicates that the sample can be well used as ultraviolet absorber.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2015年第12期3612-3616,共5页
Journal of Synthetic Crystals
基金
安徽省自然科学基金(1508085SME219)
安徽大学大学生科研训练计划项目
关键词
CEO2
水热合成
形貌
光学性质
铁磁性
CeO2
hydrothermal synthesis
morphology
optical property
ferromagnetism
