摘要
采用传统的固相反应法在La空位的La2/3Ba1/3MnO3粉末中掺入第二相ZnO,制备了一系列La空位的La2/3(1-x)Ba1/3MnO3/0.33ZnO(LBMO/ZnO)和La空位掺Dy的(La(0.6-x)Dy0.4)2/3Ba1/3MnO3/0.33ZnO(LBDMO/ZnO)复合体系。Rietveld方法拟合X射线衍射(XRD)测量结果表明,LBMO/ZnO复合体系中的LBMO为单相的钙钛矿结构,LBMO的结构参数(包括晶格参数,晶胞体积)以及Mn-O键长,Mn-O-Mn键角随空位浓度的增加呈单调变化的趋势;LBDMO/ZnO复合体系中除了形成LB-MO相外,还存在DyMnO3杂相,LBDMO的结构参数以及Mn-O键长,Mn-O-Mn键角随空位浓度x的增加几乎没有发生变化。XRD和扫描电子显微镜(SEM)都表明ZnO和锰氧化物没有发生反应,ZnO可能以非晶态的形式存在于复合体系中,这将影响复合体系的电磁输运性质。
A series of composites including La2/3（1-x）Ba1/3MnO3/0.33ZnO（LBMO/ZnO）with La-site vacancies and（La（0.6-x）Dy0.4）2/3Ba1/3MnO3/0.33ZnO（LBDMO/ZnO）with La-site vacancies and doping Dy by mixing ZnO with La2/3Ba1/3MnO3 is synthesized by solid-state reaction method.The results are analyzed by Rietveld Refinement of XRD indicate that LBMO oxides are single-phase perovskite structure and their structure parameters（lattice constants,crystal volumes）,Mn-O bond length and Mn-O-Mn bond angle varying with the different La vacancy concentration have monotonic changes;manganese oxides in the LBDMO/ZnO composites have LBMO phase with impurity DyMnOz,their structure parameters, Mn-O bond length and Mn-O-Mn bond angle of LBDMO have no changes with La vacancies increasing. XRD and SEM hints that ZnO has no reaction with manganese oxides and ZnO may be amorphous in the composites, which may affect the electric and magnetic transport properties of composites.
出处
《科学技术与工程》
2009年第23期7113-7116,共4页
Science Technology and Engineering
