气悬浮技术制备RFeO3体系及其相关物理特性研究
毕业论文关键词：钙钛矿型化合物；RFeO3；磁性能；气悬浮技术
Study on Preparation of RFeO3 air suspension system and related physical characteristics
Abstract：As a kind of important functional materials, orthorhombic perovskite structure RFeO3 (R is rare earth element) of rare earth ferrite with unique magnetic energy, found in the rare earth ferrite laser induced ultrafast spin reorientation and iron, magnetic materials, rare earth ferrite becomes condensed state and materials physics in the study of hot. RFeO3 crystals with high quality and related materials, preparation and characteristics of, become a significant requirement for modern magnetic optical and magneto-optical studies. In this paper, a series of xSm2O3- (100-x) Fe2O3 spherical particles with different components were prepared by the technology of non vessel gas suspension. In the process of experiment, the raw material is heated and cooled fast, so as to realize rapid crystallization. This method is relatively simple, the operation is very convenient; do not need the feedback system to keep the sample balance; temperature control and convenient, cooling solidification speed faster, refinement of the samples of the onlookers organization, the sample composition is more uniform, is conducive to the new metastable phase formation; advantages. And the XRD, SEM, VSM and other testing methods were used to analyze and study the correlation of xSm2O3- (100-x) Fe2O3 and the microstructure and magnetic properties of SmFeO3 ceramic particles. By XRD analysis, it is found that the single phase of the Sm2O3/Fe2O3=50/50, crystallinity compared to other components the best, which Sm2O3/Fe2O3=30/50, 60 / 40 and 70 / 30 crystallinity can also, other components of the crystallization degree is poor. ; SmFeO3 ceramic microstructure was analyzed by scanning electron microscopy (SEM) and SmFeO3 ceramic surface in form of dendritic growth, while showing a certain orientation, dark interdendritic rule lined with bright precipitates; through the magnetic analysis of SmFeO3, found iron and dilute and their magnetic moments of Tsuchihara Ko formed RFeO3 interesting magnetic behavior. Due to the lower symmetry of the quadrature phase, the FeO6 is tilted to the eight plane, which produces a weak ferromagnetic property.