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首页> 外文期刊>Physica, B. Condensed Matter >Structural analysis of nickel doped cobalt ferrite nanoparticles prapared by coprecipitation route
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Structural analysis of nickel doped cobalt ferrite nanoparticles prapared by coprecipitation route

机译：共沉淀法制备镍掺杂钴铁氧体纳米粒子的结构分析

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摘要

Magnetic nanoparticles of nickel substituted cobalt ferrite (Ni_xCo_1-zFe_2O_4:0≤x ≤1) have beensynthesized by co-precipitation route. Particles size as estimated by the full width half maximum(FWHM) of the strongest X-ray diffraction (XRD) peak and transmission electron microscopy (TEM)techniques was found in the range 18-28 +4 nm. Energy dispersive X-ray (EDX) analysis confirms thepresence of Co, Ni, Fe and oxygen as well as the desired phases in the prepared nanoparticles. Theselective area electron diffraction (SAED) analysis confirms the crystalline nature of the preparednanoparticles. Data collected from the magnetization hysteresis loops of the samples show that theprepared nanoparticles are highly magnetic at room temperature. Both coercivity and saturationmagnetization of the samples were found to decrease linearly with increasing Ni-concentration incobalt ferrite. Superparamagnetic blocking temperature as determined from the zero field cooled (ZFC)magnetization curve shows a decreasing trend with increasing Ni-concentration in cobalt ferritenanoparticles.
机译：共沉淀法合成了镍取代钴铁氧体的磁性纳米粒子（Ni_xCo_1-zFe_2O_4：0≤x≤1）。通过最强的X射线衍射（XRD）峰的全宽半峰（FWHM）和透射电子显微镜（TEM）技术估算的颗粒大小在18-28 +4 nm范围内。能量色散X射线（EDX）分析证实了制备的纳米颗粒中Co，Ni，Fe和氧的存在以及所需的相。选择性区域电子衍射（SAED）分析证实了所制备纳米颗粒的晶体性质。从样品的磁化磁滞回线收集的数据表明，所制备的纳米颗粒在室温下具有高磁性。发现样品中的矫顽力和饱和磁化强度都随着镍铁含量的增加而线性降低。由零磁场冷却（ZFC）磁化曲线确定的超顺磁阻挡温度显示出随着铁素体钴纳米颗粒中Ni浓度的增加而降低的趋势。

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