钙钛矿型纳米BaFeO3的制备、结构表征及铁磁性研究

采用溶胶-凝胶法制备出钙钛矿型纳米BaFeO₃粉末，利用X射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)分析研究了其微观结构及形貌，结果表明：胶体试样经800℃退火处理后，形成了20nm左右的钙钛矿型BaFeO₃粉末，其(110)面晶面间距为0.280nm左右，(100)面晶面间距为0.401nm左右.利用振动样品磁强计(VSM)研究了纳米BaFeO₃粉末的室温铁磁性能，测量结果表明：在室温条件下，纳米BaFeO关键词： 溶胶-凝胶法 3')" href="#">钙钛矿型纳米BaFeO₃ 铁磁性 氧空位

Preparation, structure and ferromagnetic properties of perovskite BaFeO3 nanocrystals

The Perovskite BaFeO₃ nano-powder has been synthesized by sol-gel method. The micro-structure and morphology of BaFeO₃ nano-powder have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). The results showed that the samples annealed at 800 ℃ formed the perovskite-type BaFeO₃ with grain size of about 20 nm and the (110) and (100) spacings of about 0.280 nm and 0.401 nm, respectively. The room temperature magnetic properties of samples have been measured on vibrating sample magnetometer (VSM). It is shown that the BaFeO₃ nano-powder has a complete hysteresis loop, which means that BaFeO₃ powder possess significant weak ferromagnetism at room temperature, and this property changes obviously with the annealing temperature. Ferromagnetism of perovskite BaFeO₃ nano-powder mainly originates from oxygen vacancy among Fe³⁺-O-Fe⁴⁺.