钙钛矿化合物SrFe_(1-x)Cu_xO_(3-δ)(0≤x≤0.3)的制备及磁性

Preparation and magnetism of Copper doped perovskite oxides SrFe_(1-x)Cu_xO_(3-δ)(0≤x≤0.3)

采用溶胶-凝胶法制备钙钛矿结构化合物Sr Fe1-xCuxO3-δ(0≤x≤0.3)的多晶样品,通过X射线衍射(XRD)结合Rietveld结构精修方法研究该化合物的晶体结构,并使用物性综合测量系统(PPMS)研究其磁性能。精修结果表明掺Cu可使样品发生结构转变,x=0的样品为I4/mmm点群的正方结构,而x=0.1,0.2,0.3的样品均为Pm 3 m点群的立方结构,晶格常数随Cu含量的增加而减小。磁性测量的结果表明Cu含量越高,造成铁磁和反铁磁相互作用的竞争越激烈,形成自旋玻璃态;x=0.1,0.2,0.3的样品转变温度低于x=0的样品,但随Cu含量增加,x=0.1,0.2,0.3的样品转变温度逐渐升高;随Cu含量增加,Fe/Cu位的有效磁矩减小。

SrFe1-xCuxO3-δ（0≤x≤0.3） polycrystalline materials were prepared by sol-gel method. The crystal structures were researched by X-ray diffraction（XRD） with Rietveld refinement method and the magnetism was measured by physical property measurement system（PPMS）. The Rietveld refinement results show that the crystal structure shift from the tetragonal structure to a cubic structure,sample with x=0 is tetragonal structure with a space group of I4/mmm,and samples with x=0.1,0.2,0.3 are cubic structure with Pm 3^- m. The magnetic measurement results show that the competing ferromagnetic and antiferromagnetic effects along with the Cu content give rise to the spin glass behavior; the transition temperatures of sample with x=0.1,0.2,0.3 increase with increasing Cu content, but lower than x=0; The effective moment μeff of Fe/Cu decreases with increasing Cu content.