柠檬酸盐燃烧法合成多铁性BiFeO3纳米粒子及其磁性和介电性能
Magnetic and Dielectric Properties of Multiferroic BiFeO3 Nanoparticles Synthesized by a Novel Citrate Combustion Method
摘要：
首次采用柠檬酸盐燃烧法在不使用任何溶剂的情况下成功合成了单相BiFeO 3纳米粒子。将金属硝酸盐与作为燃料的柠檬酸充分混合，在退火后燃烧得到BiFeO 3纳米颗粒。这些颗粒本质上是单相的，并且以菱形畸变钙钛矿结构（空间群-R3 c）结晶，这已经通过室温粉末X射线衍射数据的Rietveld精修证实。从透射电子显微镜照片中可以看到平均粒径为47 nm的近球形颗粒。室温磁滞测量显示弱铁磁性，但磁化强度不饱和高达1.75 T的外加磁场。矫顽场值为180 Oe，比用甘氨酸无溶剂燃烧法制备的矫顽场高3倍。~（57）Fe穆斯堡尔谱可用对应于铁原子Fe ~（3+）态的超精细场49.5T单磁态的六重态拟合。讨论了介电弛豫和交流电导率随频率的变化。高介电常数没有发现在这些纳米粒子像其他报道的BiFeO 3陶瓷。
英文摘要：
Single phase BiFeO3 nanoparticles have been successfully synthesized for the first time by a novel citrate combustion method without using any solvent. Well mixed metal nitrates along with citric acid which is used as fuel combust to give BiFeO3 nanoparticles after annealing. These particles are single phase in nature and crystallize in the rhombohedral distorted perovskite structure (space group-R3c) which has been confirmed by the Rietveld refinement of the room temperature powder x-ray diffraction data. Nearly spherical particles of average particle size 47 nm have been seen from transmission electron micrograph. Room temperature magnetic hysteresis measurement shows weak ferromagnetism though the magnetization does not saturate upto 1.75 T applied field. The coercive field value is calculated to be 180 Oe which is 3 times higher than that prepared by solvent free combustion method using Glycine. 57Fe Mössbauer spectrum can be fitted with a sextet corresponding to single magnetic state of hyperfine field about 49.5 T corresponding to Fe3+ state of the iron atom. The dielectric relaxation and ac conductivity as a function of frequency have been discussed. High dielectric permittivity has not been found in these nanoparticles like other reported BiFeO3 ceramics.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
