论文标题
增强的RCP和COFE $ _2 $ o $ $ _4 $纳米粒子合成的纳米颗粒的大型逆磁效应
Enhanced RCP and large inverse magnetocaloric effect of CoFe$_2$O$_4$ nanoparticles synthesized by auto-combustion method
论文作者
论文摘要
这项工作着重于COFE $ _2 $ o $ $ _4 $（CFO）纳米颗粒的微结构，磁性和磁化效应，该纳米颗粒由Sol-Gel Auto Cobustion方法详细阐述。 XRD研究表明，CFO在立方尖晶石结构中结晶，SEM显微照片显示出精细的准球形，平均晶粒尺寸为160 nm。拉曼光谱的温度依赖性揭示了从723 K开始的磁磁到顺磁性（FM-PM）的过渡，磁化与温度测量结果显示，位于t $ _ {\ rm c} $ = 785 K的库里温度，磁性温度的大量变化的大量均值$δ$ t = 11.2 k = 11.2 k的含量变化。 kg $^{ - 1} $是通过麦克斯韦方法间接实现的，使我们的CFO纳米库适合在环境温度下用于环保磁制冷和医疗应用。
This work focuses on the microstructure, magnetic properties and magnetocaloric effect of CoFe$_2$O$_4$ (CFO) nanoparticles elaborated by sol-gel auto combustion method. The XRD investigation indicates that CFO is crystallized in a cubic spinel structure and the SEM micrograph shows a fine quasi-spherical with an average grain sizes of 160 nm. The temperature dependence of the Raman spectra reveals the ferromagnetic to paramagnetic (FM-PM) transition started from 723 K and the magnetization versus temperature measurements shows the Curie temperature located at T$_{\rm C}$ = 785 K. Large value of magnetocaloric temperature change of $Δ$T =11.2 K with a high RCP of 687.56 J Kg$^{-1}$ are achieved indirectly via the Maxwell approach making our CFO nanopowder suitable candidate for both environmentally friendly magnetic refrigeration and medical applications at ambient temperature.
