Effect of double substituted m-barium hexaferrites on microwave absorption properties

• Autorzy: Lima R. C. , Pinho M. S. , Gregori M. L. , Nunes R. C. , Ogasawara T.
• Języki publikacji: EN

Abstrakty

EN

The complex permeability ( a?r*) and permittivity ( e?r*) of radar absorbing materials (RAMs) play a key role in determining the reflection and attenuation properties of incident microwaves. Their real (a?' and e?') and imaginary (a?'' and e?'') components and relationship with microwave absorbing properties have been investigated in the frequency range 8-16 GHz for doped M-type barium hexaferrites in polychloroprene (CR) matrices. Individual and simultaneous substitutions of Fe3+ ions by Co2+, Ti4+, and Mn3+, and of Ba2+ ions by La3+ and Na+ make possible the use of these materials as RAMs, due to frequency dependence of ??* of hexaferrite, responsible for the location of its natural resonance. A double substitution of Ba2+ and Fe3+ (LaNaCoTiMn-BaHF) resulted in the best microwave absorption (99.9%) at the frequency of 15 GHz.

Słowa kluczowe

EN

microwave absorbing materials; doped ferrites; composites; waveguide

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2004
• Tom: Vol. 22, No. 3
• Strony: 245--252
• Opis fizyczny: Bibliogr. 15 poz.

Twórcy

autor

Lima R. C.

• Instituto de Pesquisas da Marinha, Rio de Janeiro, RJ, Brazil
• Engenharia Metalúrgica da Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil

autor

Pinho M. S.

• Instituto de Pesquisas da Marinha, Rio de Janeiro, RJ, Brazil
• Instituto de Macromoléculas (IMA) da Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil

autor

Gregori M. L.

• Instituto de Pesquisas da Marinha, Rio de Janeiro, RJ, Brazil

autor

Nunes R. C.

• Instituto de Macromoléculas (IMA) da Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil

autor

Ogasawara T.

• Engenharia Metalúrgica da Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil

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