An Inexpensive Route to Synthesize High-Purity CrO 2 for EMI Shielding in X-Band Frequencies

Abstract

Rod-shaped high-purity samples of CrO 2 have been synthesized by an inexpensive and simplified procedure. Here, we have prepared pure CrO 2 without applying any external pressure or control it during synthesis. The sample prepared exhibited an improvement in saturation magnetization values, 68 emu/g at 300 K, 136 emu/g at 80 K, and uniform grained microstructure. The complex permittivity, permeability, and microwave absorption properties of high-purity CrO 2 sample were investigated in the 8.2–12.2 GHz (X-band) microwave frequency range. Microwave measurements have shown the high shielding effectiveness due to absorption (SE A ) of 20.3 dB. The high value of SE A suggests that CrO 2 can be used as a promising electromagnetic shielding, EMI, material in 8.2–12.2 GHz (X-band) microwave frequency range.