Microwave absorption characteristics of Co²⁺ and W⁴⁺ substituted M-type Ba_0.5Sr_0.5Co_xW_xFe_12−2xO₁₉ hex

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• 作者：Rajat Joshi ; Charanjeet Singh ; Dalveer Kaur…
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：28
• 期：1
• 页码：228-235
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1573-482X
• 卷排序：28

文摘

The Co2+ and W4+ ions substituted M-type hexagonal ferrites, with chemical compositional formula Ba_0.5Sr_0.5Co_xW_xFe_12−2xO₁₉ (x = 0.0, 0.2, 0.8 and 1.0), were synthesized by a standard ceramic method. The phase evolution of the compositions was characterized by using an X-ray diffraction. The microwave absorption of compositions has been investigated as a function of frequency, substitution and thickness from 8.2 to 12.4 GHz by an absorber testing device method. The microwave absorption has been evaluated using the standard model of quarter wavelength mechanism and an impedance matching mechanism. The microwave absorption is enhanced in x = 0.0 and 0.2, with former owes 97.0 % absorbed power at 11.22 GHz and 2.4 mm respectively. Compositions x = 0.0, 0.2 and 0.8 exhibit −10 dB absorption bandwidth of 500 MHz while x = 1.0 owes 330 and 340 MHz.