Zahra Samreen, Naz Uzma, Irshad Misbah, Sheikh Asma, Zahra Sarwat
Mineral Processing Research Centre, Pakistan Council of Scientific and Industrial Research Laboratories Complex, Ferozepur Road, Lahore, 54600, Pakistan.
Department of Chemistry, University of Education, College Road Township, Lahore, 54770, Pakistan.
BMC Chem. 2025 Apr 21;19(1):106. doi: 10.1186/s13065-025-01454-w.
Aqueous route of sol-gel method was used to synthesize nanocrystalline nickel ferrite (NiFeO) from a stoichiometric mixture of nickel nitrate hexahydtrate and ferric nitrate nonahydrate precursors using aqueous ethanol as solvent and polypropylene glycol as a stabilizing agent. The gel obtained was calcined at various temperatures ranging from 500 °C to 900 °C. The effect of calcination temperature on structural and magnetic properties of nickel ferrite was determined by X-ray diffraction, infrared spectroscopy, thermogravimetry, field emission scanning electron microscopy and vibrating sample magnetometry.
The results showed a single phase nickel ferrite with a cubic spinel structure having particles of irregular shape and different sizes ranging from 10 to 20 nanometers, randomly distributed to form aggregates.
The results revealed that the use of polypropylene glycol as a stabilizing agent significantly reduced the agglomeration of nickel ferrite nanoparticles. However, loosely aggregated grains were obtained that got separated with the rise in calcination temperature leading to the formation of more prominent and well-dispersed structures at 900 ºC. Moreover, the samples exhibited high coercivity indispensible for the application of nanoparticles in storage and magnetic devices.
采用溶胶 - 凝胶法的水相路线，以六水合硝酸镍和九水合硝酸铁为前驱体的化学计量混合物，以乙醇水溶液为溶剂，聚丙二醇为稳定剂，合成了纳米晶镍铁氧体（NiFeO）。将得到的凝胶在500℃至900℃的不同温度下煅烧。通过X射线衍射、红外光谱、热重分析、场发射扫描电子显微镜和振动样品磁强计测定煅烧温度对镍铁氧体结构和磁性的影响。
结果表明，得到了具有立方尖晶石结构的单相镍铁氧体，其颗粒形状不规则，尺寸在10至20纳米之间，随机分布形成聚集体。
结果表明，使用聚丙二醇作为稳定剂可显著减少镍铁氧体纳米颗粒的团聚。然而，得到了松散聚集的晶粒，随着煅烧温度的升高，这些晶粒会分离，从而在900℃时形成更突出且分散良好的结构。此外，这些样品表现出高矫顽力，这对于纳米颗粒在存储和磁性器件中的应用是必不可少的。
