Almessiere Munirah A, Slimani Yassine, Ali Sadaqat, Baykal Abdulhadi, Balasamy Rabindran Jermy, Guner Sadik, Auwal İsmail A, Trukhanov Alex V, Trukhanov Sergei V, Manikandan Ayyar
Department of Biophysics, Institute for Research and Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia.
Department of Physics, College of Science, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia.
Nanomaterials (Basel). 2022 Aug 21;12(16):2872. doi: 10.3390/nano12162872.
Co-Ni ferrite is one of the crucial materials for the electronic industry. A partial substitution with a rare-earth metal brings about modification in crystal lattice and broadens knowledge in the discovery of new magnetic material. Current work reports a Ga substitution in the Co-Ni ferrite with composition CoNiFeGaO (where x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0), herein referred to as spinel ferrite microspheres (CoNiGa-SFMCs). The samples were crystallized hydrothermally showing a hollow sphere morphology. The crystal phase, magnetic, morphology, and optical behaviour were examined using various microscopy and spectroscopic tools. While the XRD confirmed the phase of SFMCs, the crystallite size varied between 9 and 12 nm. The Tauc plot obtained from DRS (diffuse reflectance spectroscopy) shows the direct optical energy bandgap () of the products, with the pristine reading having the value of 1.41 eV ; the band gap increased almost linearly up to 1.62 eV along with rising the Ga amount. The magnetic features, on the other hand, indicated the decrease in coercivity (H) as more Ga is introduced. Moreover, there was a gradual increase in both saturation magnetization (M) and magnetic moment (nB) with increasing amount of Ga till x = 0.6 and then a progressive decline with increases in the x content; this was ascribed to the spin-glass-like behavior at low temperatures. It was detected that magnetic properties correlate well with crystallite/particle size, cation distribution, and anisotropy.
钴镍铁氧体是电子工业的关键材料之一。用稀土金属进行部分替代会导致晶格发生变化，并拓宽了新型磁性材料的发现领域。当前的工作报道了在钴镍铁氧体中进行镓替代，其成分是CoNiFeGaO（其中x = 0.0、0.2、0.4、0.6、0.8和1.0），在此称为尖晶石铁氧体微球（CoNiGa - SFMCs）。这些样品通过水热法结晶，呈现出空心球形态。使用各种显微镜和光谱工具对其晶相、磁性、形态和光学行为进行了研究。XRD证实了SFMCs的相，微晶尺寸在9至12纳米之间变化。从DRS（漫反射光谱）获得的Tauc图显示了产物的直接光学能带隙（），原始样品的值为1.41 eV；随着镓含量的增加，带隙几乎呈线性增加，直至1.62 eV。另一方面，磁性特征表明随着更多镓的引入，矫顽力（H）降低。此外，随着镓含量增加，饱和磁化强度（M）和磁矩（nB）都逐渐增加，直至x = 0.6，然后随着x含量的增加逐渐下降；这归因于低温下的自旋玻璃状行为。研究发现磁性与微晶/颗粒尺寸、阳离子分布和各向异性密切相关。
