Fabrication of superparamagnetic spinel calcium ferrite nanoparticles by the auto-combustion sol-gel method and investigation of their structural, microstructural, and magnetic properties

IF 2.1 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS
S. E. Mousavi Ghahfarokhi, E. Mohammadzadeh Shobegar, H. Motamedi
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Abstract

In this research, calcium ferrite nanoparticles (CaFe2O4) were first synthesized and structurally characterized by the self-combustion sol-gel method at temperatures of 300–700 ˚C and a time of 8 h, and then at a temperature of 400 ˚C and times of 2–10 h. Their microstructure and magnetism were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), atomic force microscope (AFM), and vibrating sample magnetometer (VSM). X-ray diffraction analysis showed that the manufactured samples have a spinel structure and the size of the nanocrystals was estimated between 7 and 12 nm and 4–10 nm at different temperatures and sintering times using Scherer’s equation. This study showed that a pure calcium ferrite sample (CaFe2O4) is formed at 400 ˚C temperature and 8 h time respectively. The presence of metal-oxide vibrational modes was confirmed by an infrared spectrometer (FT-IR) in calcium ferrite nanoparticles at all temperatures and sintering times. Field emission scanning electron microscope and transmission electron microscope analyses confirmed the nanostructure of calcium ferrite. Also, it showed that the shape of the nanoparticles is spherical and the size of the particles increased with increasing temperature and sintering time. To check the topography of the surface and study the microstructure of the samples, analysis (AFM) was performed. The results of this analysis showed that calcium ferrite nanoparticles have a uniform distribution and also, have a spherical shape with an average size of 18 nm. Magnetic properties of nanoparticles such as saturation magnetization (Ms) and magnetic coercive field (Hc) were investigated by vibrating sample magnetometer (VSM) at room temperature and the results showed that calcium ferrite nanoparticles have superparamagnetic behavior at different temperatures and sintering times. In addition, by measuring the Curie temperature (Tc) of the samples, it was observed that the Curie temperature decreases with the increase of the sintering temperature. In contrast the Curie temperature increases with the increase of the sintering time.

自燃烧溶胶-凝胶法制备超顺磁性尖晶石铁酸钙纳米颗粒及其结构、微观结构和磁性能研究
本研究首先合成了铁酸钙纳米颗粒CaFe2O4,并采用自燃烧溶胶-凝胶法对其进行了结构表征,温度为300-700℃,反应时间为8 h,温度为400℃,反应时间为2-10 h。采用x射线衍射(XRD)、场发射扫描电镜(FESEM)、透射电镜(TEM)、原子力显微镜(AFM)、振动样品磁强计(VSM)。x射线衍射分析表明,制备的样品具有尖晶石结构,在不同温度和烧结时间下,利用Scherer方程估计了纳米晶体的尺寸在7 ~ 12 nm和4 ~ 10 nm之间。结果表明,在400℃温度下和8 h时间下,形成了纯铁酸钙(CaFe2O4)样品。红外光谱仪(FT-IR)证实了铁酸钙纳米颗粒在所有温度和烧结时间下存在金属氧化物振动模式。场发射扫描电镜和透射电镜分析证实了铁酸钙的纳米结构。结果表明,纳米颗粒呈球形,粒径随烧结温度和烧结时间的增加而增大。为了检查表面形貌和研究样品的微观结构,进行了AFM分析。分析结果表明,铁酸钙纳米颗粒分布均匀,呈球形,平均尺寸为18 nm。利用振动样品磁强计(VSM)对纳米颗粒的饱和磁化强度(Ms)和矫顽力(Hc)等磁性能进行了研究,结果表明:在不同温度和烧结时间下,铁酸钙纳米颗粒具有超顺磁性。另外,通过测量样品的居里温度(Tc),发现样品的居里温度随烧结温度的升高而降低。居里温度随烧结时间的延长而升高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of the Australian Ceramic Society
Journal of the Australian Ceramic Society Materials Science-Materials Chemistry
CiteScore
3.70
自引率
5.30%
发文量
123
期刊介绍: Publishes high quality research and technical papers in all areas of ceramic and related materials Spans the broad and growing fields of ceramic technology, material science and bioceramics Chronicles new advances in ceramic materials, manufacturing processes and applications Journal of the Australian Ceramic Society since 1965 Professional language editing service is available through our affiliates Nature Research Editing Service and American Journal Experts at the author''s cost and does not guarantee that the manuscript will be reviewed or accepted
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