Electromagnetic properties and microwave absorption of W-type hexagonal ferrites doped with La3+

Nanostructured La0.7Sr0.3MnO3compounds for effective electromagnetic interference shielding in the X-band frequency range

“…The permittivity is generated from electronic, ionic, space charge, and interfacial polarization, which means that permittivity is a measure of the polarizability of a material. 30,31 The increase in permittivity can be attributed to the increase in carrier concentration and conductivity.…”

Simple and reproducible preparation of barium hexagonal ferrite by adsorbent combustion method

“…For the optimized absorber, the minimum RL reached to À15.3 dB in the frequency of 13.4 GHz. It is worth noting that the absorber obtains RL values exceeding À10 dB in the frequency range of 10.3-18 GHz, which covers half of the X-band (8-12 GHz) and the whole K u -band (12)(13)(14)(15)(16)(17)(18). Previous studies showed that the absorption bandwidth (RL < À10 dB) reached about 4 GHz with the absorber thickness of 2 mm [12,13].…”

“…Consequently, the need for efficient preparation of pure-phase hexagonal ferrites with highly homogeneous hexagonal-plate shape is increasing [13][14][15]. The most common approaches of particular interest are the ceramic method and the sol-gel method [16][17][18]. The ceramic method is simple and efficient, but it usually mixes nonuniformly and may destroy the hexagonal-plate morphology during the milling process [15,19].…”

W-type hexaferrite nanoparticles: A consideration for microwave attenuation at wide frequency band of 0.5–10GHz

“…For example, substitution of Nd 3+ on Ba 2+ site in BaCo 2 Fe 16 O 27 resulted in a considerable increment of microwave absorption [4]. A reflection loss (RL) of 39.6 dB and absorption bandwidth of more than 8 GHz (at −10 dB) with matching thickness of 2 mm are obtained for La 3+ doped W-type hexaferrite [5]. Similarly when La 3+ was doped in M-type hexaferrite the reflection loss was −41.7 dB (at −10 dB) over 4 GHz at a thickness of 2.3 mm [6].…”