Electromagnetic wave absorption properties of nanocomposite powders derived from intermetallic compounds and amporphous carbon

摘要

Nanocomposite materials consisting of Y_2Fe_(17) and amorphous carbon (a-C) were prepared by a mechanical grinding method. Mean crystalline size of the Y_2Fen particles in the nanocomposite materials was evaluated to be 20 nm from the line broadening of diffraction peaks. Complex permittivity, permeability and electromagnetic wave absorption properties of resin compact containing 75 wt.percent Y_2Fe_(17)/a-C powders showed the good electromagnetic wave absorption properties of the minimum reflection loss (RL) value of - 48 dB at 17 GHz with a matching thickness of a 1.3 mm because the eddy current loss was effectively suppressed by increasing the electric resistance for Y_2Fen particle with hybridization with a-C as an insulator.