Enhanced Microwave Absorption Property of Ho–Ce–Co Alloy

In this study, Ho_xCe_2–xCo₁₇ (x = 0, 0.2, 0.6, 1.0) powders were fabricated by melting and ball milling successfully. The influence of Ho content on phase structure, morphology, electromagnetic parameters and microwave absorbing property is examined by relevant equipment. The consequences revealed that the addition of Ho content has no effects on the main phase Ce₂Co₁₇ and there is a decrease in particle size. As a whole, the minimum absorption peak frequency shifts to a lower frequency with increasing Ho content. The minimum reflection loss (RL) value of Ho_0.6Ce_1.4Co₁₇ can reach –42.99 dB at 6.48 GHz with the thickness of 2.0 mm and the bandwidth of RL < –10 dB achieve 1.6 GHz. With the different thicknesses of 1.5 to 3.5 mm, the minimum RL value of Ho_0.6Ce_1.4Co₁₇ powder is less than –15 dB in the whole C-band (4–8 GHz), and the Ho_0.6Ce_1.4Co₁₇ powder can achieve the minimum RL of –12.74 dB at 3.6 GHz with the thickness of 3.5 mm in the S-band (2–4 GHz). These results indicate that the Ho–Ce–Co alloy has better potential to be applied in broadband and low frequency with better absorbing properties.