Seminar Series:
Nick NguyenUniversity of Georgia, Department of Chemistry
Monday, October 24, 2016 - 11:15am
Chemistry Building, Room 400

Radar absorbing materials (RAMs) have been researched since the advent of radar detection technology in the early 1900’s. RAMs are most commonly used when space or weight are restricted such as in stealth coatings on aircraft or ships. Effective RAMs are “lossy” materials which absorb or disperse electromagnetic (EM) radiation in the radio and microwave region (0-30 GHz). Ferrites are a well-researched class of RAMs often employed as films or plates that have narrow, tunable ranges of strong EM absorbance  (<-10dB)1 0.5 – 2.0 GHz in breadth. The general formula for ferrites is AFe2O3 where A is a divalent metal such as magnesium, nickel or zinc2; iron can also be substituted with trivalent metals such as cobalt or aluminum3. This presentation will focus on recent research into ferrite doping4, the manipulation of particle size5 and coating composition6,7 to affect the strength and location of ferrite absorption bands. 

  1. Andersson, N.; Andersson, R.; Bergman, V.; Ek, M.; Malmberg, K., Synthesis and characterization of radar absorbing nanocomposites. Royal Institute of Technology, Stockholm, Sweden 2006.
  2. Ünal, B.; Ünver, İ. S.; Güngüneş, H.; Topal, U.; Baykal, A.; Sözeri, H., Microwave, dielectric and magnetic properties of Mg-Ti substituted Ni-Zn ferrite nanoparticles. Ceramics International 2016, 42 (15), 17317-17331.
  3. Zhou, L.; Zhou, W. C.; Su, J. B.; Luo, F.; Zhu, D. M.; Dong, Y. L., Plasma sprayed Al2O3/FeCrAl composite coatings for electromagnetic wave absorption application. Applied Surface Science 2012, 258 (7), 2691-2696.
  4. Khan, K., Microwave Absorption Properties of Radar Absorbing Nanosized Cobalt Ferrites for High Frequency Applications. Journal of Superconductivity & Novel Magnetism 2014, 27 (2), 453-461.
  5. Kumar, A.; Agarwala, V.; Singh, D., Effect of Particle Size of Bafe< Sub> 12 O< Sub> 19 on the Microwave Absorption Characteristics in X-Band. Progress in Electromagnetics Research M 2013, 29, 223-236.
  6. Meshram, M. R.; Agrawal, N. K.; Sinha, B.; Misra, P. S., Characterization of M-type barium hexagonal ferrite-based wide band microwave absorber. Journal of Magnetism and Magnetic Materials 2004, 271 (2–3), 207-214.
  7. Gama, A. M.; Rezende, M. C.; Dantas, C. C., Dependence of microwave absorption properties on ferrite volume fraction in MnZn ferrite/rubber radar absorbing materials. Journal of Magnetism and Magnetic Materials 2011, 323 (22), 2782-2785.