Nickel-cobalt-zinc ferrite nanoparticles for radio-frequency/terahertz frequency-selective surface application

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IET Nanodielectrics Pub Date : 2021-02-22 DOI:10.1049/nde2.12004
Meenakshi Arya, Mayuri N. Gandhi, Shriganesh S. Prabhu, Venu Gopal Achanta, Siddhartha P Duttagupta
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引用次数: 4

Abstract

Nanoparticles of Ni0.5Co0.2Zn0.3Fe2O4 were prepared using the sol-gel combustion route. The nanoparticles were characterised by x-ray diffraction to confirm single-phase formation in a cubic spinel structure. Micro- and nanostructural analyses were carried out using field emission-scanning electron microscopy and field emission-transmission electron microscopy, respectively. A planetary ball milling technique was used to grind the powder into nanoparticles; the average particle size was 64 nm. Energy-dispersive X-ray spectroscopy was used to determine the atomic composition of the sample. Radio-frequency characteristics were recorded for dielectric measurement in a frequency range of 1 Hz to 15 MHz using a broadband dielectric spectrometer. Terahertz (THz) time-domain spectroscopy was performed to study THz-optical parameters such as refractive index, dielectric constant, and conductivity at room temperature in a frequency range of 0.3−2.2 THz using an indigenously developed THz time-domain spectroscopy setup. The magnetic properties of the sample were studied using a SQUID vibrating sample magnetometer under an applied magnetic field of ±10 kOe. An examination of M-H loops revealed that the saturation magnetization ( M s ) , remanent magnetization ( M r ) and coercivity ( H c ) increased with an increase in temperature from 300 to 50 K.

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用于射频/太赫兹频率选择性表面应用的镍钴锌铁氧体纳米颗粒
采用溶胶-凝胶燃烧法制备了Ni0.5Co0.2Zn0.3Fe2O4纳米颗粒。用x射线衍射对纳米颗粒进行了表征,证实了立方尖晶石结构中单相的形成。采用场发射扫描电镜和场发射透射电镜对其进行微观和纳米结构分析。采用行星球磨技术将粉末磨成纳米颗粒;平均粒径为64 nm。采用能量色散x射线光谱法测定样品的原子组成。使用宽带介电光谱仪记录了1 Hz至15 MHz频率范围内的介电测量的射频特性。太赫兹(THz)时域光谱研究了太赫兹(THz)光学参数,如折射率,介电常数,和电导率在室温下0.3 - 2.2太赫兹频率范围内使用国产太赫兹时域光谱设置。在±10 kOe的外加磁场下,用SQUID振动样品磁强计研究了样品的磁性能。对M- h环的研究表明,饱和磁化强度(M s),剩余磁化强度(mrr)和矫顽力(hc)随温度从300 ~ 50 K的升高而增大。
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来源期刊
IET Nanodielectrics
IET Nanodielectrics Materials Science-Materials Chemistry
CiteScore
5.60
自引率
3.70%
发文量
7
审稿时长
21 weeks
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