闪烁单晶钨酸锌的坩埚下降法生长  

Growth of Scintillation Crystal ZnWO_4 by Bridgman Method

作　　者：赵学洋[1] 张敬富[1] 方义权 胡旭波[1] 向军涛[1] 潘建国[1] 陈红兵[1] 

机构地区：[1]宁波大学材料科学与工程研究所,新型功能材料及其制备科学国家重点实验室培育基地,宁波315211

出　　处：《人工晶体学报》2014年第10期2475-2480,共6页Journal of Synthetic Crystals

基　　金：973计划前期研究专项(2011CB612306);国家自然科学基金(21171102);宁波大学王宽城幸福基金

摘　　要：通过高温固相反应或湿化学法合成ZnWO4多晶料,采用垂直坩埚下降法生长出φ25 mm×60 mm的透明完整钨酸锌单晶。应用X射线粉末衍射分析证实了所制备钨酸锌多晶与单晶的结晶物相,测试了钨酸锌单晶的紫外可见透射光谱、光致发射光谱和X射线激发发射光谱,讨论了此闪烁单晶的氧气氛退火效应。结果表明,该单晶的透射光谱在400-800 nm波长区域呈现典型光学透过性,其吸收截止边位于380 nm左右,在紫外激发光或X射线激发作用下,此单晶具有峰值波长位于470 nm的荧光发射;此单晶经980℃温度下的氧气氛退火处理,其晶体着色有所变浅而光学透过性得以明显改善。ZnWO4polycrystalline material were prepared by solid-state sintering process or wet-chemical method. A transparent ZnWO4 single crystal with size of φ25 mm × 60 mm were grown by vertical Bridgman method. ZnWO4 polycrystalline material and as-grown single crystal were characterized with crystalline phase by X-ray powder diffraction. The spectral properties of the crystal wafers were investigated by means of optical transmittance,photoluminescence and X-ray stimulated luminescence spectra. The annealing effect of the single crystal in oxygen atmosphere was also discussed by comparing the optical spectra of the crystal wafers before and after annealing treatment. The results show a typical optical transmittance in 400-800 nm wavelength range with an absorption edge of 380 nm or so. The single crystal exhibits a fluorescence emission with central wavelength at 470 nm under violet photonic stimulation or X-ray excitation. The crystal colouration could alleviate and optical transmittance could improve significantly after the single crystal was annealled in oxygen atmosphere at 980 ℃.

关 键 词：闪烁晶体 钨酸锌 单晶生长 坩埚下降法 

分 类 号：O78[理学—晶体学]