1,10-邻菲(口罗)啉荧光光度法测定微量元素硒

研究了痕量元素硒的荧光强度测试新方法,进行了最佳条件实验.该法有良好的线性关系(r=0.9991),检测限是1.0×10-9mol·L-1,RSD(n=6)为0.47%,回收率在92.6%～106.9%之间.     

Ba掺杂多铁BiFeO_3陶瓷的制备及性能

采用固相法成功地制备出了Ba掺杂多铁BiFeO3(BFO)的Bi1-x Bax FeO3(x=0.1,0.15,0.2,0.3)陶瓷,研究了Ba掺杂含量对陶瓷结构、铁电、漏电以及磁性的影响,制得的陶瓷为菱形扭曲的钙钛矿结构,属于R3c空间群,Ba掺杂含量较高时会转变为赝立方结构;随着Ba掺杂含量的升高,铁电电滞回线的矩形度变好,漏电流密度减小.当x=0.3时,电滞回线的矩形度最好,漏电流密度最小,其值为8×10-6 A/cm2,与纯相BFO陶瓷相比,下降了两个数量级.磁性测试表明,Bi1-x Bax FeO3陶瓷具有饱和的磁滞回线,随Ba掺杂浓度的增加,其剩余磁性经历了一个先增大后下降的过程,其最大剩余磁化强度可达9emu/g.Ba掺杂显著地改善了BFO陶瓷的铁电性和磁性.     

多铁复合纳米陶瓷BaTiO3-CoFe2O4的制备及性能研究

采用溶胶-凝胶法和化学共沉淀法制备了BaTiO3-CoFe2O4两相复合纳米粉体,利用固态烧结法制备出BaTiO3-CoFe2O4多铁性复合陶瓷.XRD测试和实验结果表明,两相复合陶瓷中同时含有四方相的BaTiO3陶瓷和立方相的CoFe2O4陶瓷.复合纳米陶瓷具有较好的铁电性和铁磁性,为进一步研究其磁电耦合效应及应用奠定了良好的基础.     

Synthesis and Multiferroic Properties of BiFeO3 Nanotubes

Highly ordered BiFeO3（BFO） nanotubes with about 200nm in diameter and 60μm in length are fabricated by a sol-gel AAO template method. A perovskite-type structure of BFO is confirmed in the nanotubes by transmission electron microscopy and selected area electron diffraction analysis. The coexistence of ferroelectric and ferromagnetic ordering of these BFO nanotubes at room temperature is demonstrated, giving a remnant polarization of 26μC/cm2, a low coercive electric field of 60kV/cm, and a magnetization of 0.18emu/g. In addition, it is found that the leakage behavior of these nanotubes is dominated by the ohmic contact mechanism.