Abstract
Multiband electromagnetic wave absorption have been studied on nanocrystalline (1-x) NiFe2O4 (NFO)/(x)BaTiO3 (BTO) composites. The samples were synthesized by solid state reaction using high energy milling (HEM) instrument. The composite samples were characterized using X-ray Diffractometer (XRD) and vibrating sample magnetometer (VSM) instrument. The X-ray diffraction (XRD) patterns of all the samples show single phase and free from impurities. The NFO sample can be indexed to a single cubic crystal structure with a space group of Fd-3m, No. 227. While, the BTO sample can be indexed to a single tetragonal crystal structure with a space group of P4mm, No. 99. The composite samples consist of two phases, namely NFO and BTO showing soft magnetic performance. The mass magnetization is in the range of 20.0–49.0 emu/g. The electromagnetic parameters of the composites were measured by a vector network analyser in the frequency range of 2 GHz to 18 GHz. The results indicated that (1-x) NiFe2O4 / (x) BaTiO3 composites display three-band electromagnetic wave absorption. The 0.5NiFe2O4 / 0.5BaTiO3 composite displays three-band reflection loss which is larger than the other one and the three-band reflection loss are almost the same, i.e., below the -15 dB. From these experiments it can be concluded that the 0.5NiFe2O4 / 0.5BaTiO3 composite is good candidate for electro-magnetic wave absorption.
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