A_3BGa_3Si_2O_(14)类晶体的旋光特性研究  

Study on Optical Activities of A_3BGa_3Si_2O_(14) Crystals

作　　者：魏爱俭[1] 王宝林[1] 袁多荣[2] 

机构地区：[1]山东大学信息科学与工程学院,山东济南250100 [2]山东大学晶体材料国家重点实验室,山东济南250100

出　　处：《中国稀土学报》2006年第4期507-509,共3页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金资助项目(50372034);山东大学晶体材料国家重点实验室开放基金资助项目(11170005240303)

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。Four crystals with the general formula of A3BGa3Si2O14（A = Ca^2＋, Sr^2＋; B = Nb^5＋, Ta^5＋） 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 show that they have large optical paralle activities polasizers which are larger than that of LGS. Of the four crystals, Sr3NbGa3Si2O14 has the largest optical activity. 240.75 （°）· mm^-1 at 0.30μm wavelength, 34.73 （°）· mm^-1 at 0. 633μm wavelength. The Boltzmann＇s coefficients of these crystals were calculated, which were in good agreement with earlier measurement in other reference.

关 键 词：无机非金属材料 晶体生长 A3BGa3Si2O14系列晶体 旋光率 波尔兹曼系数 稀土 

分 类 号：O436.1[机械工程—光学工程] O782[理学—光学]