Sm-incorporated CoCr2O4 nanoparticles: tunable structural, optical, and magnetic properties

IF 2.8 4区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Sipun Mohanty, Mritunjoy Prasad Ghosh, Samrat Mukherjee
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引用次数: 0

Abstract

In order to solve environmental challenges and fulfill the growing demand for renewable energy sources, researchers worldwide are looking for effective nanomaterials to cleanse wastewater and replace fossil fuels. In this study, doping of Sm3+ ions in nanocrystalline cobalt chromites and their effects on the structural, optical, and magnetic characteristics have been investigated thoroughly. Four Sm-doped nanosized cobalt chromites with a generic formula of CoSmxCr2-xO4 (x = 0.0, 0.03, 0.06, and 0.09) were prepared using the conventional wet co-precipitation technique. Powder x-ray diffractograms were obtained to confirm the cubic spinel crystal structure formation. Average crystallite sizes were observed to reduce with increasing Sm percentage in CoCr2O4 nanoparticles. The mean particle sizes derived from HRTEM images also followed a similar trend. Indirect optical band gaps increased with increasing Sm content in the host nanosized chromites. Vibrational Raman spectra recorded at room temperature confirmed the lowering of crystal symmetry for higher Sm content chromite samples. The Néel temperature of doped chromite nanoparticles was noticed to reduce with increasing Sm concentration. A gradual increase of effective anisotropy constant at 5 K with increasing Sm dopants confirmed the presence of various surface effects in the doped chromite samples. The doped samples have various applications, including sensors, detectors, photocatalysis, solar cells, and hyperthermia.

钐掺杂的CoCr2O4纳米颗粒:可调的结构、光学和磁性
为了解决环境挑战和满足对可再生能源日益增长的需求,世界各地的研究人员正在寻找有效的纳米材料来净化废水和取代化石燃料。本文研究了Sm3+离子在纳米晶钴铬铁矿中的掺杂及其对纳米晶钴铬铁矿结构、光学和磁性的影响。采用常规湿共沉淀法制备了4种smm掺杂纳米钴铬铁,其通式为CoSmxCr2-xO4 (x = 0.0、0.03、0.06和0.09)。粉末x射线衍射图证实了立方尖晶石晶体结构的形成。随着Sm含量的增加,CoCr2O4纳米颗粒的平均晶粒尺寸减小。从HRTEM图像中得到的平均粒径也遵循类似的趋势。间接光学带隙随着宿主纳米铬铁矿中Sm含量的增加而增加。室温下记录的振动拉曼光谱证实了高Sm含量铬铁矿样品的晶体对称性降低。随着Sm浓度的增加,掺杂铬铁矿纳米颗粒的nsamel温度降低。随着Sm掺杂量的增加,5 K时有效各向异性常数逐渐增加,证实了掺杂铬铁矿样品中存在各种表面效应。掺杂样品有各种应用,包括传感器、探测器、光催化、太阳能电池和热疗。
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来源期刊
Journal of Materials Science: Materials in Electronics
Journal of Materials Science: Materials in Electronics 工程技术-材料科学:综合
CiteScore
5.00
自引率
7.10%
发文量
1931
审稿时长
2 months
期刊介绍: The Journal of Materials Science: Materials in Electronics is an established refereed companion to the Journal of Materials Science. It publishes papers on materials and their applications in modern electronics, covering the ground between fundamental science, such as semiconductor physics, and work concerned specifically with applications. It explores the growth and preparation of new materials, as well as their processing, fabrication, bonding and encapsulation, together with the reliability, failure analysis, quality assurance and characterization related to the whole range of applications in electronics. The Journal presents papers in newly developing fields such as low dimensional structures and devices, optoelectronics including III-V compounds, glasses and linear/non-linear crystal materials and lasers, high Tc superconductors, conducting polymers, thick film materials and new contact technologies, as well as the established electronics device and circuit materials.
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