Effects of cobalt substitution on structure and microwave absorption properties of PrNib>5b> alloy

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• 作者：Shunkang PAN ((潘顺康))^a ; ^b ; ^{skpan88@163.com" class="auth_mail" title="E-mail the corresponding author} ; Jilei XIONG ((熊吉磊))^a ; ^b ; Lichun CHENG ((成丽春))^a ; ^b ; ^c ; Qingrong YAO ((姚青荣))^a ; ^b ; ^c ; Guanghui RAO ((饶光辉))^a ; ^b
• 关键词：PrNi5 alloy ; Co substitution ; structure ; electromagnetic parameters ; microwave absorbing properties ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2015
• 出版时间：1 December 2015
• 年：2015
• 卷：33
• 期：12
• 页码：1324-1328
• 全文大小：1786 K

文摘

The polycrystalline samples PrNib>5–xb>Cob>xb> (x=0.0, 0.1, 0.2, 0.3, 0.4) were synthesized by arc smelting and high energy ball milling method. The phase structure, morphology, saturation magnetization and electromagnetic parameters of the alloy powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometry (VSM) and vector network analyzer (VNA), respectively. The results revealed that the lattice parameter a and c and unit-cell volume V increased with the increasing amount of Co substitution. The saturation magnetization increased as Co content increased. The minimum absorption peak frequency shifted towards lower frequency region with the increasing amount of Co substitution. And the minimum reflection loss of the PrNib>5–xb>Cob>xb> powders increased first and then decreased with the increasing amount of Co substitution. The PrNib>5–xb>Cob>xb> alloys possessed the excellent microwave absorbing properties. The minimum reflection loss of the PrNib>4.9b>Cob>0.1b> alloy all could reach −20.0 dB with the coating thickness ranging from 1.8 to 3 mm. The minimum reflection loss of PrNib>4.9b>Cob>0.1b> powders was −36.20 dB at 7.76 GHz, and the frequency bandwidth of R<–10 dB reached about 1.50 GHz with the best matching condition d=2.0 mm.