TY - JOUR
T1 - W-type hexaferrite nanoparticles
T2 - A consideration for microwave attenuation at wide frequency band of 0.5-10 GHz
AU - Iqbal, Muhammad Javed
AU - Khan, Rafaqat Ali
AU - Takeda, Shigeru
AU - Mizukami, Shigemi
AU - Miyazaki, Terunobu
N1 - Funding Information:
The authors are thankful to Higher Education Commission (HEC) of Pakistan for supporting this work.
PY - 2011/6
Y1 - 2011/6
N2 - The static and dynamic magnetic properties of W-type hexaferrites are tuned to meet the requirements of wide band frequencies for attenuation of electromagnetic interference and microwave absorptions purposes. For this purpose, the W-type hexaferrite of entirely new composition of BaCoZnFe 16-2yAlyCeyO27 (y = 0, 0.2, 0.4, 0.6, 0.8 and 1.0) has been synthesized by the chemical co-precipitation. The material is characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). The complex permittivity (εr = ε′ - jε″) and permeability (μr = μ′ - jμ″) spectra are determined using Vector Network Analyzer (VNA) in a range from 0.5 GHz to 10 GHz. During this study, it is noticeable that the Al3+ and Ce 3+ ions have considerable effect on the shape of the nanoparticles. Samples having Al-Ce contents y = 0.2 and y = 0.4 showed large values for magnetization (70.5 emu/g) and remanent magnetization (32.9 emu/g). In addition, more than 99% absorption (>-20 dB) is noted for this sample composition. Based on these results it is concluded that the microwave absorption characteristics of these compounds can be tuned for the required frequency by varying the thickness of the absorber. Due to this reason, potential employment of the synthesized nanoparticles for absorption of electromagnetic radiations at wide frequency band of 0.5-10 GHz has been proposed.
AB - The static and dynamic magnetic properties of W-type hexaferrites are tuned to meet the requirements of wide band frequencies for attenuation of electromagnetic interference and microwave absorptions purposes. For this purpose, the W-type hexaferrite of entirely new composition of BaCoZnFe 16-2yAlyCeyO27 (y = 0, 0.2, 0.4, 0.6, 0.8 and 1.0) has been synthesized by the chemical co-precipitation. The material is characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). The complex permittivity (εr = ε′ - jε″) and permeability (μr = μ′ - jμ″) spectra are determined using Vector Network Analyzer (VNA) in a range from 0.5 GHz to 10 GHz. During this study, it is noticeable that the Al3+ and Ce 3+ ions have considerable effect on the shape of the nanoparticles. Samples having Al-Ce contents y = 0.2 and y = 0.4 showed large values for magnetization (70.5 emu/g) and remanent magnetization (32.9 emu/g). In addition, more than 99% absorption (>-20 dB) is noted for this sample composition. Based on these results it is concluded that the microwave absorption characteristics of these compounds can be tuned for the required frequency by varying the thickness of the absorber. Due to this reason, potential employment of the synthesized nanoparticles for absorption of electromagnetic radiations at wide frequency band of 0.5-10 GHz has been proposed.
KW - Chemical synthesis
KW - Magnetic measurements
KW - Microstructure
KW - Microwave absorption
KW - Permanent magnets
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U2 - 10.1016/j.jallcom.2011.04.103
DO - 10.1016/j.jallcom.2011.04.103
M3 - Article
AN - SCOPUS:79958243340
SN - 0925-8388
VL - 509
SP - 7618
EP - 7624
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 28
ER -