Khatun Nazia, Ahmed Sajib, Hossain Mohammad Sajjad, Uddin Farhad Syed Farid, Mamun Md Al-, Alam Mohammad Saiful, Begum Most Hosney Ara, Tanvir Nazmul Islam, Hakim Mahmuda, Islam Suravi
Industrial Physics Division, BCSIR Laboratories Dhaka, Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka 1205, Bangladesh.
Department of Applied Chemistry and Chemical Engineering, Noakhali Science and Technology University (NSTU), Bangladesh.
Heliyon. 2023 Jan 24;9(2):e13019. doi: 10.1016/j.heliyon.2023.e13019. eCollection 2023 Feb.
In the current study, nanocrystalline CoYLaFeO (where x = 0.00, 0.02, 0.04, 0.06, 0.08, and 0.10) ferrites have been synthesized via a sol-gel auto combustion process. The synthesized powders were pressed into pellet forms and sintered at 900 °C for 4 h in the air. X-ray diffractometry (XRD) confirmed the single-phase cubic spinel structure of the synthesized samples having the mean crystallite domain sizes ranging from 122 and 54 nm. FTIR spectroscopic analyses revealed two strong bands within the range of 600 to 350 cm, further confirming the cubic inverse spinel structure of the prepared materials. The surface morphologies and composition were investigated by Field Emission Scanning Electron Microscopy (FE-SEM) and Energy Dispersive X-ray (EDX) Spectroscopy. The magnetic hysteresis curves recorded at room temperature exhibit ferrimagnetic behavior. The highest coercivity (Hc∼1276 Oe) was found at a high doping (x = 0.10) concentration of Y and La in cobalt ferrite. Dielectric constant increase with increased doping concentration whereas real-impedance and dielectric loss decrease with increased in doping concentration and applied frequency. The band gap energy increased from 1.48 to 1.53 eV with increasing Y and Laconcentrations in the UV-Vis region. The elevated levels of magnetic and dielectric substances in the ferrite nanoparticles suggest that the material could be used for magnetic recording media and high-frequency devices.
在当前研究中，通过溶胶-凝胶自燃烧法合成了纳米晶CoYLaFeO（其中x = 0.00、0.02、0.04、0.06、0.08和0.10）铁氧体。将合成的粉末压制成丸粒形式，并在空气中于900℃烧结4小时。X射线衍射法（XRD）证实了合成样品的单相立方尖晶石结构，其平均微晶畴尺寸在122至54纳米范围内。傅里叶变换红外光谱（FTIR）分析显示在600至350厘米范围内有两个强吸收带，进一步证实了所制备材料的立方反尖晶石结构。通过场发射扫描电子显微镜（FE-SEM）和能量色散X射线（EDX）光谱研究了表面形貌和成分。在室温下记录的磁滞回线呈现亚铁磁性行为。在钴铁氧体中Y和La的高掺杂（x = 0.10）浓度下发现了最高矫顽力（Hc∼1276奥斯特）。介电常数随掺杂浓度的增加而增加，而实阻抗和介电损耗随掺杂浓度和施加频率的增加而降低。在紫外-可见区域，随着Y和La浓度的增加，带隙能量从1.48电子伏特增加到1.53电子伏特。铁氧体纳米颗粒中磁性和介电物质水平的提高表明该材料可用于磁记录介质和高频器件。
