【摘要】 应用正交试验法,较系统地研究了PbMoO₄晶体生长工艺参数与晶体质量之间的关系。采用自行设计和制造的浮称自动等径生长装置,从而保证了生长条件的重复性。通过测试样品的透光率、双折射梯度、光束发散度和信噪比,以评定样品的光学均匀性,这对于材料的实际应用是十分重要的。在晶体生长的工艺参数中,以配料组成对晶体质量的影响最为显著,其次为拉速,温度梯度和转速的作用较小。通过岩相分析和电子探针分析确认,当配料组成从化学计量向PbO偏离时容易导致晶体中出现散射小晶粒;向MoO₃偏离时影响更为严重,使熔体产生组分过冷。已应用获得的最佳生长条件生长出高质量晶体,并用此晶体制造了声光偏转器和声光调制器。更多还原

【Abstract】 This work aims at investigation on the relationship between growth parameters andquality of crystal. One of the distinguishing features of this investigation is the use of cross examinationmethod in which a mathematic treatment is used to arrange the order of examination andto process the experimental data. Another feature of this investigation is the highly re-producible growth conditions of the diameter obtained by the use of the automatically con-trolled bouyancy balance designed by the authors. Light transmission, birefringent gra-dient, divergency and S/N ratio of the transmitted light beam have been used to evaluatethe crystal homogeneity because of their importance from the practical point of view.Among growth parameters, the batch composition has been found to play a decisive rolein crystal quality.Secondary to it, is the pulling rate.The effects of temperature gradientand the rotating rate prove to be rather small. By means of petrography and electron-probe microanalysis it has been affirmed thatthe crystalline particles of Pb₂MoO₅ appear to scatter in the crystal when the batch com-position deviates from stoichiometry to PbO rich region.On the other hand, if the com-position deviates to MoO₃ rich region, partial supercooling of the melt takes place cau-sing severe detriment to the quality of crystals. The authors succeeded in obtaining the optimum growth parameters for the growth ofhigh quality single crystals, which have satisfactorily met the severe requirements of theacousto-optical deflectors and modulators.更多还原