溶剂对Bi2WO6形貌及其γ射线屏蔽性能的影响  

Influence of solvents on morphology and γ-ray protective properties of Bi_2WO_6

作　　者：赵杨[1,2] 许云川[1,2] 周冬[1,2] 张全平[2] 郑剑[2] 李银涛[2] 周元林[2] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]西南科技大学四川省非金属复合与功能材料重点实验室一省部共建国家重点实验室培育基地,四川绵阳621010

出　　处：《强激光与粒子束》2017年第4期71-76,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金委员会-中国工程物理研究院联合基金项目(11176026);四川省非金属复合与功能材料国家重点实验室开放基金项目(14zx7170;15zx7159;14tdfk04)

摘　　要：通过简单的溶剂热法,在不添加任何表面活性剂的情况下,系统地研究吡啶、甘露醇、聚乙二醇和乙二醇四种溶剂对Bi_2WO_6辐射防护材料的影响。并利用XRD,SEM,TEM,HRTEM和DRS等分析技术对Bi_2WO_6晶体的组成、形貌、比表面积和禁带宽度等进行了表征。实验结果表明,溶剂对防护材料的形貌、光致发光性能和辐射防护性能有较大影响。选用吡啶作为溶剂,有利于材料形成不规则纳米球,提高其结晶度、光致发光强度及γ射线屏蔽率。该形貌下PS/Bi_2WO_6材料对^(155)Eu和^(22)Na混合点源的105.310keV的γ射线屏蔽率达54.17%,已高于传统防护材料PbWO_4。Bismuth tungstate （Bi2WO6） shielding material was prepared by a simple solvothermal method without any sur- factants and the effects of pyridine, mannitol, polyethylene glycol, ethylene glycol on it were systematically researched. The crys- talline phase, compositions, morphology, surface area and band gap energy of the Bi2WO6 were characterized by X-ray diffrac- tion, scanning electron microscopy, transmission electron microscopy and high resolution transmission electron microscopy ab- sorption spectra. It was found that the solvent had a significant influence on the morphology, photoluminescence properties and radiation shielding properties of the samples. The solvent pyridine enhanced the crystallinity, photoluminescence intensity and γ- ray shielding properties. PS/Bi2WO6 of irregular nanosphere exhibited y-ray shielding rate of 54.17% at a mixed 155Eu and 22Na point source of 105. 310 keV, which was much higher than that of conventional shielding materials like PbWO4.

关 键 词：γ射线防护 钨酸铋 溶剂 形貌 光致发光 

分 类 号：O571.323[理学—粒子物理与原子核物理]