In this work, samarium-iron garnet nanopowder (Sm3Fe5O12) was obtained and characterized by TG/DTA, XRD, SEM and EDS. The synthesis of this magnetic material was carried out by the co-precipitation method, using hydrated chlorides of the rare-earth elements and ferrous sulfate. PVA was added to the calcined powder in order to facilitate the production of a toroidal compact specimen, which was submitted to sintering in the range of 1200 ºC to 1400 ºC, to stablish a correlation of its magnetic properties with morphology.

O objetivo deste trabalho foi a obtenção de Materiais Absorvedores de Radar (RAMs) para a faixa de freqüência de 2,6 a 4,0 GHz (banda S). A carga magnética adicionada na proporção de 80% em peso à matriz de policloropreno consistiu de uma ferrita de Ni-Zn. O compósito, com espessura de 6 mm, apresentou um bom desempenho como RAM para toda a faixa de freqüência analisada com absorção de microondas superior a 96,9% (-15 dB) e com absorção máxima de 99,5% (-25 dB) em 3,2 GHz, viabilizando sua aplicação como revestimento externo em plataformas militares, segundo o ensaio de névoa salina.

The aim of this work was to obtain Radar Absorbing Materials (RAMs) for the frequency range from 2.6 to 4.0 GHz (S-band). The 80 wt.% magnetic filler addition to a polychloroprene matrix was a Ni-Zn ferrite. The composite with 6 mm thickness showed a good RAM performance for the whole range of frequency analyzed, with a microwave absorption greater than 96.9% (-15 dB), emphasizing the greatest absorption of 99.5% (- 25 dB) at 3.2 GHz, allowing its use as an external coating for naval applications, in accordance with the salt spray testing.