【摘要】 报道了La3Ga5SiO14(LGS)同构物掺杂性改进后,用提拉法生长出A3BGa3Si2O14(A=Ca2+,Sr2+;B=Nb5+,Ta5+)系列的4种晶体。此类稀土晶体均为单轴晶,属三方晶系,32点群。采用改造过的分光光度计研究了这类晶体的透过率、旋光角、旋光率色散,并与LGS进行了比较。透射率光谱显示,ABGS类晶体在大于294 nm的可见光谱区和红外区是透明的,透过率均大于LGS。偏振光透过率曲线显示这类晶体自然旋光率较大,结果表明,这4种晶体的旋光率均大于LGS,其中SNGS旋光为最大,在波长0.30μm处,ρ=240.75(°).mm-1;在0.633μm处,ρ=34.73(°).mm-1。根据实验结果计算了这类晶体的波尔兹曼系数,与文献结果吻合很好。更多还原

【Abstract】 Four crystals with the general formula of A₃BGa₃Si₂O₁₄(A=Ca²⁺,Sr²⁺;B=Nb⁵⁺,Ta⁵⁺) grown by using the Czochralsky technique were reported.They are all uniaxial and belong to 32 point group.Their transmission,rotatory angle and specific rotation dispersion were investigated by spectrophotometer and compared with LGS.The transmission spectra show that they are transparent in the visible wavelength region beyond 294 nm and infrared region,and their transmission are all larger than that of LGS.The transmission spectra between parallel polasizers show that they have large optical activities which are larger than that of LGS.Of the four crystals,(Sr₃NbGa₃Si₂O₁₄) has the largest optical activity: 240.75（°）·mm^-1 at 0.30 μm wavelength,34.73(（°）·mm^-1) at 0.633 μm wavelength.The Boltzmann′s coefficients of these crystals were calculated,which were in good agreement with earlier measurement in other reference.更多还原