Abstract
In this study, thin Pr2Co17 flakes fractured along c crystal plane are successfully prepared by a surfactant-assisted high energy ball-milling technology and then oxidized by hydrogen peroxide (H2O2). The complex permittivity and permeability of the unoxidized and oxidized Pr2Co17 flakes/epoxy composites are measured. The measured results show that the oxidation of H2O2 can effectively decrease the permittivity and simultaneously suppress the eddy. For the oxidized sample with 40 vol% Pr2Co17, the real permeability at 8.2 GHz and 12.4 GHz can reach 1.65 and 1.42, respectively, and the natural resonance frequency can reach 11.0 GHz. If used as a microwave absorber, the oxidized sample with 20 vol% Pr2Co17 flakes exhibits a very excellent microwave absorption performance in x-band when the absorber thickness t is very thin (1.3 mm < t < 1.5 mm).
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