Eu~(3+)激活的LaNb(Ta)复合卤氧化物的合成和光谱特性

采用真空气体输运技术制备了Eu0 .0 6La0 .94 M2 O6X(M =Nb ,Ta ;X =Cl,Br) ,测定了它们的晶体结构及光谱 ,研究了其光谱性质与晶体结构的关系 ,不同金属阳离子和卤素配体对铕光谱性质的影响及其变化规律。

The effect of stoichiometry on nonlinear optical properties of LiNbO3

From the chemical bond viewpoint, second-order nonlinear optical (NLO) tensor coefficients of LiNbO3 have been investigated. The single-bond contributions to the second-order NLO susceptibility and the linear susceptibility were determined. The tensor values thus calculated are in good agreement with experimental data. Based on theoretical results of LiNbO3 with Li/Nb = 1, we also have calculated linear and nonlinear optical properties of nonstoichiometric samples with Li/Nb < 1. In the calculation, we find that the Li-O bond is an important type of chemical bond in these LiNbO3 samples, which have large NLO contributions to the total nonlinearities. The refractive indices and second-order NLO tensor coefficients have been determined as a function of the stoichiometry.

液/液界面电化学分析在双水相萃取中的应用

用循环伏安法(CV)研究了聚乙二醇(PEG)-6000/磷酸钾(K_3PO_4)双水相体系中各种组分对麦迪霉素推动质子在水/硝基苯(W/NB)界面上转移行为的影响.用液/液界面电化学分析技术检测了麦迪霉素在双水相体系中的分配情况,发现了麦迪霉素在双水相体系中的选择性分配,其分配系数大于44.测定的线性范围为50～800μg/mL,回收率大于93%.