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ISRN Materials Science
Volume 2012 (2012), Article ID 948219, 4 pages
http://dx.doi.org/10.5402/2012/948219
Research Article

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

1Magnetic Standards, National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi 110 012, India
2Department of Physics, Hindu College, University of Delhi, Delhi 110007, India

Received 19 December 2011; Accepted 12 January 2012

Academic Editors: N. Bahlawane and N. Martin

Copyright © 2012 Vivek Verma et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Rod-shaped high-purity samples of CrO2 have been synthesized by an inexpensive and simplified procedure. Here, we have prepared pure CrO2 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 CrO2 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 (SEA) of 20.3 dB. The high value of SEA suggests that CrO2 can be used as a promising electromagnetic shielding, EMI, material in 8.2–12.2 GHz (X-band) microwave frequency range.