四硼酸锂单晶的非弹性光散射

The Raman spectrum of lithium Diborate (Li2B2O7:LBO) has been determined. Thedifferent internal modes have been analyzed. It is proved that the Raman spectra consist of BO3triangular and BO4 tetrahedron internal modes. Because of the effect of delocalization of electron.the LBO crystal has nonliner characters, but from the B-O streching vibration, it can be seen thatits nonliner characters is not strong.

Li_2B_4O_7单晶的加速坩埚旋转Bridgman生长

本文的工作首次应用加速坩埚旋转(ACRT)的 Bridgman(BR)方法生长了 Li_2B_4O_7(LBO)晶体,获得直径为52mm,长为60mm 的宏观完整单晶。ACRT 将 LBO 晶体生长速度提高到 BR 生长速度的1.5～2倍。并增强了生长系统抵御熔体中温度波动的能力。与 BR^(?) 生长的固液界面相比,ACRT 所产生的强迫对流没有对固液界面的形状产生明显的影响。本工作还对实际坩埚内的液流进行了模拟观察。