LaAlO_3∶0.05Eu^(3+)微晶的水热合成与表征  

Hydrothermal Synthesis and Characterization of LaAlO_3∶0.05Eu^(3+) Microcrystals

作　　者：王晓丽[1] 杨智[1] 

机构地区：[1]云南师范大学化学化工学院,昆明650500

出　　处：《高等学校化学学报》2013年第1期36-39,共4页Chemical Journal of Chinese Universities

摘　　要：通过水热反应合成了六角形LaAlO3∶0.05Eu3+微晶样品,采用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、能量色散X射线(EDX)和荧光光谱(PL)对产物进行表征,讨论了反应温度和NaOH浓度对LaAlO3合成的影响.XRD分析表明,所合成的样品属三方晶系(空间群R3c),对LaAlO3∶0.05Eu3+样品的X射线粉末衍射数据进行Rietveld精修,最终R因子为Rp=6.79%,Rwp=8.96%;其晶胞参数为a=b=0.53636(2)nm,c=1.3101(1)nm.SEM分析表明,LaAlO3∶0.05Eu3+微晶具有六角形形貌,颗粒较均匀,平均尺寸约为4!m.PL分析表明,LaAlO3∶0.05Eu3+微晶的特征发射为Eu3+的5D0→7F1跃迁发射.Uniform hexagonal microcrystals of LaA1O3 ： 0. 05Eu^3＋ of trigonal system were synthesized by a sim- ple hydrothermal method and the effects of temperature and the concentration of NaOH solution were investiga- ted. The obtained samples were characterized by scanning electron microscopy （SEM） , energy dispersive X- ray spectrometry （ EDX）, X-ray diffraction （XRD） and photoluminescence （PL） spectra. The diffraction data of LaAlO^3＋： 0. 05Eu^3＋ samples were refined by the Rietveld method using GSAS program on the basis of the strutural model of LaA103. The agreement factors are Rp = 6.79% and Rwp = 8.96%. Its lattice parameters are a=b =0. 53636（2） nm and c= 1. 3101（ 1 ） nm. SEM image exhibits the uniform hexagonal shapes of the as- synthesized LaA1O3 ： 0.05Eu^3＋ microerystals with an average diameter of about 4 μm. The PL spectrum shows that the characterization emission of LaA1O3： 0. 05Eu^3＋ is attributed to the 5D0→^7F1 magnetic dipole transition of Eu^3＋.

关 键 词：LaAlO3∶0.05Eu3+ 水热合成 发光性质 

分 类 号：O611.4[理学—无机化学]