ABSTRACT

The nickel substituted cobalt ferrite nanoparticles were synthesized via the sol–gel auto-combustion method. The single cubic spinel structure formation was confirmed from X-ray diffraction and Fourier transforms infrared spectroscopy study. The effect of lattice strain on crystalline size was studied using Williamson–Hall and the size-strain plot method. A microstructural study was performed using high-resolution field emission scanning electron microscopy. The magnetic properties were studied at room temperature using a vibrating sample magnetometer. The saturation magnetization obtained for pure cobalt nano ferrite was 79.66 emu/g comparable with the value for the bulk sample. The anisotropic constant and anisotropy field were found to be $3.53\times {10}^6$ erg/cm³ and 88.66 kOe respectively for pure cobalt ferrite. The high value of saturation magnetization, anisotropic constant and anisotropy field of cobalt ferrite are important parameters for the application of prepared samples in data recording devices.

摘要

镍取代钴铁氧体纳米粒子是通过溶胶-凝胶自燃法合成的。X 射线衍射和傅里叶变换红外光谱研究证实了单立方尖晶石结构的形成。使用 Williamson-Hall 和尺寸应变图方法研究了晶格应变对晶体尺寸的影响。使用高分辨率场发射扫描电子显微镜进行微观结构研究。使用振动样品磁强计在室温下研究磁性。纯钴纳米铁氧体获得的饱和磁化强度为 79.66 emu/g，与大块样品的值相当。发现各向异性常数和各向异性场为$3.53\times {10}^6$纯钴铁氧体分别为 erg/cm ³和 88.66 kOe。钴铁氧体的高饱和磁化强度、各向异性常数和各向异性场是制备样品在数据记录装置中应用的重要参数。