Unusual metallic behavior in nanostructured cobalt ferrite at superparamagnetic regime

R. Kannan; S. Rajagopan; A. Arunkumar; D. Vanidha; R. Murugaraj

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Unusual metallic behavior in nanostructured cobalt ferrite at superparamagnetic regime

机译：纳米结构钴铁氧体在超顺磁状态下的异常金属行为

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Cobalt ferrite nanoparticles have been synthesized by coprecipitation method by varying the precipitation temperatures. The samples have been characterized by x-ray diffraction, impedance analysis, ac conductivity, dielectric, and vibrating sample magnetometer. When the average crystallite size is in the range of 2-16 ran, these compounds behave as metallic, and upon thermal activation, they become semiconducting, indicating anomalous conducting behavior. Impedance analysis reveals a metallic to semiconducting phase transition, accompanied by grain boundary effect, gradually replaced by grain contribution. Ac conductivity measurements and dielectric analysis also confirmed the transformation, when the slope changed from positive to negative as a function of temperature. Particle size independent magnetic behavior was observed in finite size limit due to site exchange of cations between tetrahedral (A) and octahedral (B) sites.

机译：通过改变沉淀温度，通过共沉淀法合成了铁氧体钴纳米颗粒。通过X射线衍射，阻抗分析，交流电导率，电介质和振动样品磁力计对样品进行了表征。当平均微晶尺寸在2-16纳米范围内时，这些化合物表现为金属，并且在热活化后，它们变为半导体，表明导电行为异常。阻抗分析显示出金属到半导体的相变，伴随着晶界效应，逐渐被晶粒贡献所取代。当斜率随温度从正变到负时，交流电导率测量和介电分析也证实了这种转变。由于四面体（A）和八面体（B）位置之间阳离子的位置交换，在有限的尺寸限制下观察到了与粒径无关的磁行为。

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《Journal of Applied Physics》 |2012年第6期|p.063926.1-063926.8|共8页
作者
R. Kannan; S. Rajagopan; A. Arunkumar; D. Vanidha; R. Murugaraj;
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作者单位

Department of Physics, Pondicherry Engineering College, Puducherry 605 014, India;

Department of Chemistry, Pondicherry Engineering College, Puducherry 605 014, India;

Department of Physics, Pondicherry Engineering College, Puducherry 605 014, India;

Department of Physics, Pondicherry Engineering College, Puducherry 605 014, India;

Department of Physics, MIT Campus, Anna University, Chennai 600 044, India;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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正文语种 eng
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1. Semiconductor to metallic transition and polaron conduction in nanostructured cobalt ferrite [J] . Rahman A.U., Rafiq M.A., Karim S., Journal of Physics, D. Applied Physics: A Europhysics Journal . 2011,第16期

机译：纳米结构钴铁氧体中半导体到金属的跃迁和极化子传导
2. Synthesis and Thermal Behavior of Metallic Cobalt Micro and Nanostructures [J] . Marlene González Montiel, P. Santiago-Jacinto, J. A. I. Díaz Góngora, Nano-Micro Letters . 2011,第1期

机译：金属钴微结构和纳米结构的合成及热行为
3. Synthesis and Thermal Behavior of Metallic Cobalt Micro and Nanostructures [J] . Marlene González Montiel, P.Santiago-Jacinto, J.A.I.Díaz Góngora, 纳微快报：英文版 . 2011,第001期

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4. Superparamagnetic, nanocrystalline cobalt nickel zinc ferrite thin films, deposited at sub-200°C for RF CMOS applications [C] . Neelima Sangeneni, Navakanta Bhat, S.A. Shivashankar IEEE Electron Devices Technology and Manufacturing Conference . 2018

机译：超顺磁性，纳米晶钴镍锌铁氧体薄膜，于200°C以下沉积，用于RF CMOS应用
5. Design and control of the superparamagnetic properties of cobalt-based spinel ferrite nanoparticles. [D] . Samia, Anna Cristina Sibal. 2002

机译：钴基尖晶石铁氧体纳米粒子的超顺磁性能的设计和控制。
6. Temperature-Dependent Magnetic Response of Antiferromagnetic Doping in Cobalt Ferrite Nanostructures [O] . Adeela Nairan, Maaz Khan, Usman Khan, 2016

机译：钴铁氧体纳米结构中反铁磁掺杂的温度相关磁响应
7. Erratum: “Unusual metallic behavior in nanostructured cobalt ferrite at superparamagnetic regime” J. Appl. Phys. 112, 063926 (2012) [O] . R. Kannan, S. Rajagopan, A. Arunkumar, 2013

机译：错误：超顺磁性制度下纳米结构钴铁氧体的异常金属行为“J。苹果。物理。 112,063926（2012）
8. The High-Frequency Susceptibility of Certain Superparamagnetic Ferrites [R] . Pilon, R. O. 1970

机译：某些超顺磁性铁氧体的高频敏感性

Unusual metallic behavior in nanostructured cobalt ferrite at superparamagnetic regime

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