【摘要】 从ＰｂＯ和ＷＯ３混合粉末的高温熔体中生长的钨酸铅（ＰｂＷＯ４）晶体有两种相似的结构见诸文献，然而采用通常的粉末ＸＲＤ法判定结构有一定困难．为此，本文在对两种结构的振动模式进行了群论分析的基础上，采用激光散射法测定不同几何配置下的Ｒａｍａｎ谱，判定了从化学计量熔体中生长的钨酸铅晶体的结构为白钨矿结构．更多还原

【Abstract】 Abstract Two types of structure of lead tungstate scintillating crystals grown from high temperature melt of the mixed powders of PbO and WO 3 have been reported in the literatures.One is of space group C 6 4h I4 1/a,i.e.the scheelite structure,and the other D 4 4h P4/nnc.It is not easy to determine its exact structure by the X ray powder diffraction technique.On the bases of measuring its Raman spectra under different geometrical configurations and analyzing its vibration modes in the two different structures by the group theory the scheelite structure of the crystals grown from a stoichiometric melt was determined in the present paper.更多还原