镧(La)替代对镍铁氧体磁性和电性的影响:对其掺杂浓度的研究

Anandhi Deenan Venugopal, Selvanandan Selvaraj, Jhelai Sahadevan, Ikhyun Kim, Parameshwari Ramalingam, Sivaprakash Paramasivam
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本文报告了镧置换镍铁氧体(NiLa x Fe2-x O4)纳米粒子的结构、形态、磁性和介电性能。NiLa x Fe2-x O4 样品中镧的取代量在 x = 0.025 至 0.125 之间变化。采用溶液燃烧反应(SCR)法合成了纳米晶 Ni-La 铁氧体。通过利用 X 射线衍射 (XRD) 图样进行结构研究,发现所有样品中的单相都是空间群为 Pnma (62) 的正方晶系。观察到的趋势表明,La 的浓度与预测晶粒尺寸值(从 60.5 纳米到 65.2 纳米)的相应增加之间存在正相关。利用场发射扫描电子显微镜(FESEM)确认了表面形貌的纳米尺度。能量色散 X 射线(EDAX)制图为制备的镍镭铁氧体提供了成分证据。此外,X 射线光电子能谱(XPS)还能确定这些样品中各个原子的离子状态。结果表明,取代 La 后,母原子成分的离子状态没有发生变化。EDAX 和 XPS 证明制备的 NiLa x Fe2-x O4 样品纯度很高,没有任何其他杂质元素。通过调节掺杂剂的组成,这项研究可以证实铁氧体的超顺磁性能。镧原子的顺磁性降低了矫顽力值。对 NiLa x Fe2-x O4 样品进行的介电测量显示,La3+ 的取代有效地影响了电传输特性。
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Effect of lanthanum (La) substitution on the magnetic and electrical properties of nickel ferrites: an investigation of its doping concentrations
The structural, morphological, magnetic, and dielectric properties of lanthanum substituted nickel ferrite (NiLa x Fe2−x O4) nanoparticles have been reported in this article. The amount of lanthanum substitution in NiLa x Fe2−x O4 sample was varied from x = 0.025 to 0.125. The nanocrystalline Ni–La ferrites were synthesized using a solution combustion reaction (SCR) method. The orthorhombic crystal system of space group Pnma (62) is shown as the single-phase in all samples through structural investigation utilizing an X-ray diffraction (XRD) pattern. The observed trend indicates a positive correlation between the concentration of La and the corresponding rise in the predicted crystallite size values, which range from 60.5 nm to 65.2 nm. The nanoscale of the surface morphology has been confirmed by the utilisation of field emission scanning electron microscopy (FESEM). Energy dispersive X-ray (EDAX) mapping provides the compositional evidence for the prepared Ni–La ferrites. In addition, X-ray photoelectron spectroscopy (XPS) determines the ionic state of the individual atoms present in these samples. It reveals that there are no changes in the ionic state of the parent component atoms by substituting La. EDAX and XPS evidence the purity of prepared NiLa x Fe2−x O4 samples without any other impurity elements. By regulating the composition of dopants, this research can substantiate the superparamagnetic characteristics of ferrites. The paramagnetic nature of lanthanum atoms involves in reducing the coercivity value. The dielectric measurement on NiLa x Fe2−x O4 samples reveals that La3+ substitution effectively influence the electro-transport properties.
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