Department of Physics, College of Science, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, 31441 Dammam, Saudi Arabia; Department of Biophysics, Institute for Research and Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, 31441 Dammam, Saudi Arabia; Department of Nano-medicine Research, Institute for Research and Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, 31441 Dammam, Saudi Arabia.
Department of Biophysics, Institute for Research and Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, 31441 Dammam, Saudi Arabia; Department of Nano-medicine Research, Institute for Research and Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, 31441 Dammam, Saudi Arabia.
Ultrason Sonochem. 2019 Nov;58:104638. doi: 10.1016/j.ultsonch.2019.104638. Epub 2019 Jun 13.
This study expressed the influence of Tm substitution on the structural, optical and magnetic properties of Co-Zn spinel ferrites (CoZnTmFeO (0.0 ≤ x ≤ 0.04)). The different compositions were synthesized by sonochemical method using Qsonica ultrasonic homogenizer, frequency: 20 kHz and power: 70 W for 60 min. XRD patterns proved the presence of single-phase spinel ferrites with crystallites size in the 8-10 nm range. Cation distribution approved the occupancy of octahedral (B) site by Tm. The morphology and the elements stoichiometry are obtainable through FE-SEM, EDX and elemental mapping. Optical band gap (E) values were estimated via DR % (percent diffuse reflectance) investigations and Kubelka-Munk theory. Tauc plots revealed that direct E values are ranging between 1.49 and 1.68 eV. The analyses of magnetization versus magnetic field, M(H), were performed. The following magnetic parameters like saturation magnetization M, squareness ratio (SQR = M/M), magnetic moment n, coercivity H and remanence M have been evaluated. M(H) curves revealed the superparamagnetic (SP) at RT and ferromagnetic property at 10 K. It was showed that the Tm substitutions significantly affect the magnetic properties of host spinel ferrites. An increasing trend in the M, M, H, and n values was noticed for lower Tm substitution content.
本研究表达了 Tm 取代对 Co-Zn 尖晶石铁氧体（CoZnTmFeO（0.0≤x≤0.04））结构、光学和磁性能的影响。采用 Qsonica 超声匀浆器，频率为 20 kHz，功率为 70 W，超声处理 60 min，通过超声化学法合成了不同组成的样品。XRD 图谱表明存在单相尖晶石铁氧体，其晶粒尺寸在 8-10nm 范围内。阳离子分布证实了 Tm 占据了八面体（B）位。FE-SEM、EDX 和元素映射可获得形貌和元素化学计量。通过 DR%（漫反射百分比）研究和 Kubelka-Munk 理论估算了光学带隙（E）值。Tauc 图表明直接 E 值在 1.49 和 1.68eV 之间。对磁化与磁场的关系，M(H)进行了分析。评估了以下磁性参数：饱和磁化强度 M、方形比（SQR=M/M）、磁矩 n、矫顽力 H 和剩余磁化强度 M。M(H)曲线显示在室温下为超顺磁性（SP），在 10 K 下为铁磁性。结果表明，Tm 取代对主尖晶石铁氧体的磁性有显著影响。随着 Tm 取代含量的降低，M、M、H 和 n 值呈上升趋势。
