磁性离子Fe掺杂钛酸钡铁电材料的结构和物性研究

采用高温固相反应法制备了铁掺杂的钛酸钡BaTi1-xFexO3(0.1O≤x≤O.60)样品,研究了其结构、铁电和磁学性质.X射线衍射谱表征了铁掺杂钛酸钡材料的结构,确定了BaTi1-xFexO3样品为四方相结构,晶体结构精修表明掺杂离子的引入使得BaTi1-xFexO3材料的晶体结构在ab面发生了扩张,而沿c轴方向收缩.X射线光电子能谱研究了材料的化学成分和表面化学价态,表明三价和四价铁离子同时存在于晶格中,并取代四价钛离子而形成了BaTi1-xFexO3结构.样品的介电温谱和磁滞回线表明BaTi1-xFexO3材料在室温下同时具有铁电性和铁磁性.随着Fe掺杂量由10;增加至60;,单个铁离子在材料中产生的磁矩由0.70μB增加到1.55μB.通过对样品磁性的分析发现,材料的铁磁性来源于铁离子和氧离子的双交换作用.     

Research on OEF geometry control algorithm in dual-galvanometric laser scanning manufacturing

For the dual-galvanometric laser scanning manufacturing, the traditional geometry algorithm-fθonly considered the distance between the two swaying mirrors, the distance between the swaying mirror and the convex lens, the mirror swaying angle, and the lens focal length. And it could not correctly express the manufacturing track which was made geometry distorted. Based on analysis, a creative geometry control algorithm-optical entire factors (OEF) was brought forward. From the creative algorithm it can be known that OEF geometry control algorithm was concerned with not only the distance of the two swaying mirrors, distance between the swaying mirror and the convex lens, mirror swaying angle, and lens focal length, but also the lens central height, lens convex radius, and medium refractive index. The manufacturing system can manufacture satisfied geometry with the creative double ends approach (DEA) control model based on OEF in the experiments.