Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue 6, Pages 2929-2932Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.11.161
Keywords
Carbon; Complex permeability; Complex permittivity; Electromagnetic wave absorption; Nd2Fe14B; Reflection loss
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Funding
- National Basic Research Program of China [2010CB934603]
- Ministry of Science and Technology of China
- National Natural Science Foundation of China [50831006, 50701045]
- Hong Kong Polytechnic University [G-YX3V]
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Nd2Fe14B/C microparticles were prepared by a mechanical mixing technique using a weight ratio of 2:1. Paraffin-bonded Nd2Fe14B/C composites were fabricated using 40 wt% microparticles, and their electromagnetic wave absorption properties were studied and compared with those of the paraffin-bonded Nd2Fe14B composites in the 2-18 GHz frequency range and for 1-5 mm thickness. The Nd2Fe14B/C-paraffin composites exhibit dual dielectric resonance in complex relative permittivity (epsilon(r)) and essentially flat response in complex relative permeability (mu(r)) rather than showing an abrupt change in both epsilon(r) and mu(r) as in the Nd2Fe14B-paraffin composites. The results are ascribed to the increased electrical resistivity in the Nd2Fe14B/C-paraffin composites and the protection on the magnetic properties of the Nd2Fe14B microparticles at 2-18 GHz by the presence of the C phase. Large reflection loss (RL) exceeding -10 dB and an optimal RL of -13.2 dB are achieved in the Nd2Fe14B/C-paraffin composites from 9.6 to 18 GHz at a thickness of 1.4-2.6 mm and at 18 GHz at a thickness of 1.4 mm, respectively. (C) 2010 Elsevier B.V. All rights reserved.
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