摘要
以硝酸铅和钨酸钠为原料,以聚乙二醇-400为分散剂,采用沉淀法制备出不同形貌的钨酸铅微晶。采用X射线衍射(XRD)、扫描电镜(FESEM)测试、能量分散光谱(EDS)、荧光光谱(PL)对样品进行了表征。结果表明:在80℃烘干后,得到结晶性能良好的纯相PbWO4;随着聚乙二醇-400量的增加,钨酸铅微晶形貌由塔状变向梭子状转变,且分散性良好、无团聚发生;PbWO4微晶在350～650 nm范围内具有较宽的发射谱带,由三组主要的发光峰构成,分别在430 nm、465 nm左右的蓝色发光峰和560 nm左右的弱的黄绿色发光峰。最后研究了PEG-400在PbWO4微晶生长阶段的控制作用,并提出了PbWO4有序微晶结构的形成机理。
Lead tungstate microcrystals with different morphologies were prepared by precipitation method,using lead nitrate and natrium tungstate as starting materials and polyglycol-400 as surfactant.The sample were characterized by XRD,FESEM,EDS and PL.Results of X-ray diffraction（XRD） and FESEM indicated that the pure lead tungstate microcrystals were obtained after being heat-treated at 80 ℃;As the PEG-400 content increasing,the morphology of lead tungstate changed from the tower into a shuttle,well dispersed and no reunion;the luminescence spectra of the PbWO4 microcrystals exhibit a wide band of 350-650 nm,the emission band was composed of three main emission,the blue light emission at 430 nm and 465 nm,the weak greenish-yellow light emission at 560 nm.Finally,the control function of the PEG-400 in growth stage of PbWO4 microcrystals was investigated and the formation mechanism of the ordered PbWO4 microcrystals was proposed.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2012年第2期401-406,共6页
Journal of Synthetic Crystals
基金
浙江省国际科技合作项目(2008C14088)
浙江省重点科技创新团队资金(2009R50010)资助项目
浙江省科技厅项目(2012C31G2040043)
关键词
钨酸铅
微晶
表面活性剂
形成机理
lead tungstate
microcrystal
surfactant
formation mechanism
