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Structural, physical, and magnetic properties of nanocrystalline manganese-substituted lithium ferrite synthesized by sol–gel autocombustion technique
Applied Physics A ( IF 2.7 ) Pub Date : 2020-06-26 , DOI: 10.1007/s00339-020-03737-6
W. R. Agami , M. A. Ashmawy

Nanoparticles of spinel ferrite Li 0.5–0.5 x Mn x Fe 2.5–0.5 x O 4 ( x = 0, 0.25, 0.5, 0.75 and 1) were prepared by sol–gel autocombustion technique. The crystalline phase formation, morphology, cation distribution, and magnetic properties of Li 0.5–0.5 x Mn x Fe 2.5–0.5 x O 4 nanoferrite samples were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), infrared (IR) spectroscopy, and vibrating sample magnetometer (VSM). The lattice parameter increases by Mn substitution, while both the crystallite size and Curie temperature ( T C ) decrease. Values for both the saturation magnetization ( M s ) and the coercivity ( H c ) were enhanced because both are larger for Mn-substituted samples than those for unsubstituted ones. The addition of Mn 2+ ions promotes ( M s ) until ( x = 0.5) then an appreciable decrease occurs, whereas the coercivity ( H c ) increases up to x = 0.25 then it decreases. The role of the substitution with Mn 2+ ions in changing all investigated properties of lithium ferrite was explained according to different theories.

中文翻译:

溶胶-凝胶自燃技术合成的纳米晶锰取代锂铁氧体的结构、物理和磁性能

尖晶石铁氧体Li 0.5-0.5 x Mn x Fe 2.5-0.5 x O 4 (x = 0, 0.25, 0.5, 0.75 和1) 的纳米颗粒是通过溶胶-凝胶自燃技术制备的。Li 0.5–0.5 x Mn x Fe 2.5–0.5 x O 4 纳米铁氧体样品的晶相形成、形态、阳离子分布和磁性能通过X射线衍射(XRD)、透射电子显微镜(TEM)、红外( IR)光谱和振动样品磁强计(VSM)。晶格参数因 Mn 取代而增加,而微晶尺寸和居里温度 (TC) 均降低。饱和磁化强度 ( M s ) 和矫顽力 ( H c ) 的值都得到了增强,因为 Mn 取代的样品比未取代的样品更大。Mn 2+ 离子的添加​​促进了 ( M s ) 直到 ( x = 0.5) 然后发生了明显的下降,而矫顽力 ( H c ) 增加到 x = 0.25 然后下降。根据不同的理论解释了用 Mn 2+ 离子取代在改变铁酸锂的所有研究性质中的作用。
更新日期:2020-06-26
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