Enhanced Relative cooling Power and large inverse magnetocaloric effect of cobalt ferrite nanoparticles synthesized by auto-combustion method
作者:Youness Hadouch、Daoud Mezzane、M'barek Amjoud、Lahoucine Hajji、Yaovi Gagou、Zdravko Kutnjak、Valentin Laguta、Yakov Kopelevich、Mimoun El Marssi
DOI:10.1016/j.jmmm.2022.169925
日期:2022.12
work focuses on the microstructure, magnetic properties and magnetocaloric effect of CoFe2O4 (CFO) nanoparticles elaborated by the sol–gel auto combustion method. The XRD investigation indicates that CFO is crystallized in a cubic spinel structure with the Fd 3¯ m space group and the SEM micrograph shows fine quasi-spherical nanoparticles with an average grain size of 160 nm. The temperature dependence
这项工作的重点是通过溶胶-凝胶自燃法制备的 CoFe 2 O 4 (CFO) 纳米颗粒的微观结构、磁性和磁热效应。XRD 研究表明,CFO 以立方尖晶石结构结晶,具有Fd 3¯ m空间群和 SEM 显微照片显示平均粒径为 160 nm 的精细准球形纳米颗粒。拉曼光谱的温度依赖性揭示了从 723 K 开始的铁磁性到顺磁性的转换。磁化温度依赖性揭示了 T C = 785 K 时的居里温度。 ΔT = 11.2 K 的大磁热温度变化值,具有 687.56 的高 RCP J Kg -1通过麦克斯韦方法间接测量,使我们的 CFO 纳米粉末成为环境温度下环保磁制冷和医疗应用的合适候选者。