Jahan Nusrat, Khan M N I, Hasan M R, Bashar M S, Islam A, Alam M K, Hakim M A, Khandaker J I
Department of Physics, Jahangirnagar University Savar Dhaka 1342 Bangladesh
Department of Physics, American International University Bangladesh (AIUB) Dhaka 1229 Bangladesh.
RSC Adv. 2022 May 18;12(24):15167-15179. doi: 10.1039/d1ra09354a. eCollection 2022 May 17.
This study explored the structural, electrical, and magnetic properties of diamagnetic aluminium (Al) substituted nickel-zinc-cobalt (Ni-Zn-Co) mixed spinel ferrites, though the research on this area is in the infancy stage. Single-phase cubic spinel structures with the 3̄ space group of the synthesized NiZnCoFeAl O (0 ≤ ≤ 0.12) ferrite samples were confirmed by X-ray diffraction (XRD) analysis. The average particle size ranged from 0.67 to 0.39 μm. Selected area electron diffraction (SAED) patterns were indexed according to the space group 3, representing the particle's crystallinity. The optical band gaps ranged from 4.784 eV to 4.766 eV. Frequency-dependent dielectric constants and ac conductivity measurement suggested that the prepared ferrites were highly resistive. Relaxation times were reduced to a low value from 45.45 μs to 1.54 μs with the composition . The Curie temperatures ( ) were 615-623 K for all samples. Real part permeabilities ( ) were relatively stable up to an extended frequency range of 10 Hz with relative quality factors (RQF) of around 10. Tuning of the properties indicates that the fabricated ferrites may be promising for high-frequency electronic devices.
本研究探索了抗磁性铝（Al）取代的镍锌钴（Ni-Zn-Co）混合尖晶石铁氧体的结构、电学和磁学性质，尽管该领域的研究尚处于起步阶段。通过X射线衍射（XRD）分析证实了合成的NiZnCoFeAl₂O₄（0≤x≤0.12）铁氧体样品具有3̄空间群的单相立方尖晶石结构。平均粒径范围为0.67至0.39μm。选区电子衍射（SAED）图案根据空间群3进行索引，代表颗粒的结晶度。光学带隙范围为4.784 eV至4.766 eV。频率相关的介电常数和交流电导率测量表明，制备的铁氧体具有高电阻性。随着成分x的变化，弛豫时间从45.45μs降低到1.54μs的低值。所有样品的居里温度（Tc）为615 - 623 K。实部磁导率（μ′）在高达10 Hz的扩展频率范围内相对稳定，相对品质因数（RQF）约为10。性能的调整表明，所制备的铁氧体在高频电子器件方面可能具有前景。
