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Effect of conducting polymer layer on microwave absorption properties of BaFe 12 O 19 TiO 2 composite
Author(s) -
Akman O.,
Durmus Z.,
Kavas H.,
Aktas B.,
Kurtan U.,
Baykal A.,
Sözeri H.
Publication year - 2013
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201228498
Subject(s) - materials science , microwave , composite material , dielectric , absorption (acoustics) , composite number , polypyrrole , scanning electron microscope , polymer , dielectric loss , layer (electronics) , analytical chemistry (journal) , reflection loss , polymerization , chemistry , physics , optoelectronics , chromatography , quantum mechanics
Ba‐hexaferrite (BaM) particles, synthesized by a sol–gel route, have been mixed with TiO 2 powders with different mass ratios. The obtained BaMTiO 2 composites have been coated with a conducting polymer layer of polypyrrole (PPy). Structural, magnetic and microwave absorption properties of the PPy‐coated and uncoated BaMTiO 2 composites have been investigated by X‐ray diffractometry (XRD), scanning/tunneling electron microscopy, magnetization, and near‐field microwave measurements in the frequency range of 8–18 GHz. The dielectric loss of the PPy‐coated composites appeared to be higher compared to the uncoated samples in the whole frequency range. A single matching frequency was observed for each of the coated and uncoated samples in the frequency range between 16 and 18 GHz. Despite their relatively low absorption properties of uncoated composites (∼−30 dB), PPy‐coated ones have wide absorption bandwidths at −20 dB. The main absorption mechanism in all samples, coated and uncoated, is dielectric loss.