Mehrifar Younes, Moqtaderi Hamed, Hamidi Seyedeh Mehri, Golbabaei Farideh, Hasanzadeh Mahdi, Dehghan Somayeh Farhang
Student Research Committee, School of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Department of Mechanical Engineering, Faculty of Engineering, Alzahra University, Tehran, Iran.
Sci Rep. 2025 Jan 25;15(1):3257. doi: 10.1038/s41598-025-87301-3.
The magnetic material Nd2Fe14B is one of the strongest magnetic materials found in nature. The demand for the production of these nanoparticles is significantly high due to their exceptional properties. The aim of the present study is to synthesize magnetic nanoparticles of Nd2Fe14B using ethanol in the wet ball milling technique (WBMT). Nd2Fe14B powder an average particle size(APS) of 730 nm was subjected to wet ball milling in stainless steel cup containing 5 mm diameter steel balls.The powder was milled for 12 h at 400 rpm, with intervals of 15 min and a 15-second pause each time. The morphology of the powder and nanoparticles, crystallinity, changes of the samples under temperature, magnetic properties, and the structural bonds were analyzed using field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), vibrating sample magnetometry (VSM), and Fourier-transform infrared spectroscopy (FTIR).The microstructural images revealed that the shape of the particles changed from flat(730 nm) to spherical(76 nm) after WBMT. The crystallinity results indicated a hexagonal crystal structure, with the average crystallite size being 17.1 nm. In the spectrum of the synthesized Nd2Fe14B nanoparticles, a peak appeared at a wavenumber of 803 cm, along with peaks at wavenumbers of 1037 cm and 1083 cm, which are associated with the stretching vibrations of Nd-Fe, Fe-B, and Nd-B bonds, respectively. Numerical results of magnetic performance parameters indicated the ferromagnetic properties of the particles(HC = 6097.47, Mr = 34.65 and MS = 49.11).It appears that in WBMT, the operational parameters significantly affect the average crystallite size, saturation magnetization, as well as the size and shape of the nanoparticles. Additionally, the ferromagnetic nature of Nd2Fe14B in the hysteresis loop plays an important role in the thermal stability of the nanoparticles.
磁性材料钕铁硼（Nd2Fe14B）是自然界中最强的磁性材料之一。由于其卓越的性能，对这些纳米颗粒的生产需求非常高。本研究的目的是在湿球磨技术（WBMT）中使用乙醇合成钕铁硼（Nd2Fe14B）磁性纳米颗粒。将平均粒径（APS）为730纳米的钕铁硼（Nd2Fe14B）粉末置于装有直径5毫米钢球的不锈钢杯中进行湿球磨。粉末在400转/分钟的转速下研磨12小时，每次间隔15分钟并暂停15秒。使用场发射扫描电子显微镜（FESEM）、X射线衍射（XRD）、热重分析（TGA）、振动样品磁强计（VSM）和傅里叶变换红外光谱（FTIR）分析了粉末和纳米颗粒的形态、结晶度、样品在温度下的变化、磁性以及结构键。微观结构图像显示，湿球磨后颗粒形状从扁平状（730纳米）变为球形（76纳米）。结晶度结果表明为六方晶体结构，平均晶粒尺寸为17.1纳米。在合成的钕铁硼（Nd2Fe14B）纳米颗粒光谱中，在波数803厘米处出现一个峰，同时在波数1037厘米和1083厘米处出现峰，分别与钕 - 铁、铁 - 硼和钕 - 硼键的拉伸振动相关。磁性能参数的数值结果表明颗粒具有铁磁特性（矫顽力HC = 6097.47，剩磁Mr = 34.65，饱和磁化强度Ms = 49.11）。看来在湿球磨过程中，操作参数显著影响平均晶粒尺寸、饱和磁化强度以及纳米颗粒的尺寸和形状。此外，钕铁硼（Nd2Fe14B）在磁滞回线中的铁磁性质在纳米颗粒的热稳定性中起重要作用。
