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The Magneto-mechanical Properties of Cobalt Substituted Mg-Zn Nanoferrites
Journal of Superconductivity and Novel Magnetism ( IF 1.8 ) Pub Date : 2020-06-08 , DOI: 10.1007/s10948-020-05562-7
N. S. Al-Bassami , S. F. Mansour , M. A. Abdo

Despite increasing solicitude in magnesium-zinc ferrites as advanced ceramics, there is still much uncertainty regarding their mechanical and magnetic properties. Precursors Co2+ ions substituted magnesium zinc spinel ferrites with chemical formula Mg0.8Zn0.2-xCoxFe2O4; (0 ≤ x ≤ 0.2) (MZCFO) were scrutinized. XRD patterns confirmed the formation of the spinel structure for all MZCFO nanoferrites with no traces of any secondary phases. An excellent correlation is between the structural, mechanical, and magnetic theoretical and experimental results; supporting the validity of cation distribution. The experimental lattice parameter of MZCFO is found in the range 8.3893–8.3803 Å, and the theoretical one is found in the range 8.3882–8.3833 Å. The average crystallite size is calculated using the two methods (Debye–Scherrer and Williamson–Hall), which was found in the range ~15–50 nm, to confirm the nanocrystalline nature of all MZCFO ferrites. The FE-SEM micrographs illustrate the nanoferrite morphology exhibiting rocky-shaped particles with variable pore size. The HR-TEM micrographs of the as-prepared nanoferrites reveal agglomerated round-shaped nanoferrite particles. EDX spectra reveal the presence of all chemical elements, and SAED micrographs confirm the polycrystalline nanosized nature of MZCFO samples. Also, FTIR analysis affirmed the spinel structure by exhibiting the distinctive vibrational band of the ferrite bonds. Experimental and theoretical elastic moduli (bulk (B), rigidity (G), Young (E)) besides Poisson ratio (σ) and Debye temperature (ϴD) of MZCFO nanoferrites were investigated. The bond length is the main reason for the insignificant variation in the elastic moduli of MZCFO with further cobalt substitution. Cation distribution is the main reason for the nanoferrite Mg0.8Zn0.12Co0.08Fe2O4 (x = 0.08) to have the highest MS value (40 emu/g) and the exceptional level of flexibility obtained for the mechanical properties. The coercivity exhibits an increasing demeanor with Co2+ substitution (HC = 569.35 at x = 0.2), which is correlated to the strong magnetic anisotropy property of Co2+ species in B sites. These advantages can initiate a considerable attention in implementing this ferrite in applications such as high-density magnetic recording, loudspeakers, and sensors.



中文翻译:

钴取代的Mg-Zn纳米铁氧体的磁机械性能

尽管镁锌铁氧体作为高级陶瓷的要求越来越高,但它们的机械和磁性能仍存在很多不确定性。前驱体Co 2+离子取代了化学式为Mg 0.8 Zn 0.2-x Co x Fe 2 O 4的镁锌尖晶石铁素体;(  0≤x ≤0.2(MZCFO)。XRD图谱证实了所有MZCFO纳米铁氧体均具有尖晶石结构,没有任何次级相的痕迹。结构,机械和磁性的理论和实验结果之间有着极好的关联;支持阳离子分布的有效性。MZCFO的实验晶格参数在8.3893–8.3803Å范围内,理论值在8.3882–8.3833Å范围内。使用两种方法(Debye-Scherrer和Williamson-Hall)计算平均晶粒尺寸,发现尺寸在〜15-50 nm范围内,以确认所有MZCFO铁氧体的纳米晶体性质。FE-SEM显微照片显示了纳米铁素体形态,显示出具有可变孔径的岩石状颗粒。制备的纳米铁氧体的HR-TEM显微照片显示出团聚的圆形纳米铁氧体颗粒。EDX光谱揭示了所有化学元素的存在,而SAED显微照片证实了MZCFO样品的多晶纳米尺寸性质。另外,FTIR分析通过展现铁氧体键的独特振动带来确认尖晶石结构。实验和理论弹性模量除了泊松比(σ)和德拜温度(ϴ D)之外,还研究了B),刚度(G),杨氏(E))。键长是随着钴的进一步取代,MZCFO的弹性模量无明显变化的主要原因。阳离子分布是纳米铁氧体Mg 0.8 Zn 0.12 Co 0.08 Fe 2 O 4x  = 0.08)具有最高M S的主要原因值(40 emu / g)和机械性能获得的优异柔韧性。矫顽力表现出随着Co 2+取代行为的增加( 在x  = 0.2时H C = 569.35 ),这与Co 2+物种在B位的强磁各向异性有关。这些优点可引起在诸如高密度磁记录,扬声器和传感器等应用中实现这种铁氧体的相当大的关注。

更新日期:2020-06-08
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