Browsing by Author "Mohd Zaid M.H."
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Publication Comparative study of single- and double-layer BaFe12O19-Graphite nanocomposites for electromagnetic wave absorber applications(Pergamon-Elsevier Science Ltd, 2020) ;Ismail I. ;Ibrahim I.R. ;Matori K.A. ;Awang Z. ;Muhammad Zulkimi M.M. ;Mohd Idris F. ;Nazlan R. ;Azis R.S. ;Mohd Zaid M.H. ;Rusly S.N.A. ;Ertugrul M. ;GENIUS Insan College ;Universiti Putra Malaysia (UTM) ;Universiti Putra Malaysia (UPM) ;Universiti Teknologi MARA (UiTM) ;Universiti Sains Islam Malaysia (USIM) ;Universiti Malaysia Pahang (UMP)Ataturk UniversityThe development of stealth technology for military applications and increasing concerns of electromagnetic pollution have garnered interest to design microwave absorbing materials with wide absorption bandwidth and effective absorption properties. Two batches of samples as a potential radar absorbing material were prepared in this study: single-layer and double-layer nanocomposite mixtures of graphite and barium hexaferrite nanoparticles. Characterizations of electromagnetic and microwave absorbing properties were carried out in the frequency range of 8?12 GHz (X-band) and 12?18 GHz (Ku-band). Single-layer samples with thickness of 2 mm showed optimal absorption properties with minimum reflection loss of -20.5 dB at 11.8 GHz for X-band and -20.7 dB at 14.7 GHz for Ku-band, displaying bandwidths of 0.6 GHz for the former and 3.8 GHz for the latter at -10 dB. On the other hand, double-layer samples made of 1 mm thick barium hexaferrite matching layer and 2 mm thick graphite absorbing layer showed optimal absorption properties with minimum reflection loss of -30.0 dB at 9.2 GHz for X-band with narrower bandwidth of 0.6 GHz. The microwave absorption properties of these nanocomposites were attributed to combined effect of dielectric loss from graphite and magnetic loss from ferrite. - Some of the metrics are blocked by yourconsent settings
Publication Influence of different BFO filler content on microwave absorption performances in BiFeO3/epoxy resin composites(Elsevier Ltd, 2020) ;Rusly S.N.A. ;Ismail I. ;Matori K.A. ;Abbas Z. ;Shaari A.H. ;Awang Z. ;Ibrahim I.R. ;Idris F.M. ;Mohd Zaid M.H. ;Mahmood M.K.A. ;Hasan I.H. ;PERMATA Insan College ;Universiti Putra Malaysia (UPM) ;Universiti Teknologi MARA (UiTM)Universiti Sains Islam Malaysia (USIM)Multiferroic BiFeO3 (BFO) has garnered interest in recent years due to its magneto-electric coupling between ferroelectric and magnetic ordering. This unique property offers some advantages when applied as electromagnetic (EM) wave absorbers. In work reported here, the microwave absorption properties of multiferroic BFO/epoxy resin composites with different weight percentage (wt%) of BFO fillers of various thicknesses were investigated. The BFO powders were synthesized using high energy ball milling (HEBM) and sintered at 775 °C in a furnace with an ambient air condition. The sintered BFO powders with different weight ratios (50 wt%, 60 wt% and 70 wt%) were mixed with epoxy resin as a matrix to form a composite with thicknesses of 1, 2 and 3 mm. Phase identification, grain size and morphology, magnetic and microwave absorption properties of prepared samples were characterized. The absorption performances of samples were measured in the frequency range of 8–18 GHz. As a result, the compressed BFO powders and BFO/epoxy resin composites with 50–70 wt% BFO filler showed dual-band microwave absorption resonance behavior. The best performances were demonstrated by a 3 mm thick BFO70 composite sample which exhibited a primary reflection loss (RL1) of −26.0 dB at 9.1 GHz and a secondary reflection loss (RL2) of −40.5 dB at 11.3 GHz, along with an associated −10 dB bandwidth of 1.31 GHz. The minimum reflection loss (RL) peaks were shifted to a lower frequency as the thicknesses were increased due to theλ4 condition. Theoretical studies on the absorbing wave mechanism reveal a unique combination of dielectric loss relaxations and antiferromagnetic resonance effects in the BFO absorbers. - Some of the metrics are blocked by yourconsent settings
Publication Influence of different BFO filler content on microwave absorption performances in BiFeO3/epoxy resin composites(Elsevier Ltd, 2020) ;Rusly S.N.A. ;Ismail I. ;Matori K.A. ;Abbas Z. ;Shaari A.H. ;Awang Z. ;Ibrahim I.R. ;Idris F.M. ;Mohd Zaid M.H. ;Mahmood M.K.A. ;Hasan I.H. ;PERMATA Insan College ;Universiti Putra Malaysia (UPM) ;Universiti Teknologi MARA (UiTM)Universiti Sains Islam Malaysia (USIM)Multiferroic BiFeO3 (BFO) has garnered interest in recent years due to its magneto-electric coupling between ferroelectric and magnetic ordering. This unique property offers some advantages when applied as electromagnetic (EM) wave absorbers. In work reported here, the microwave absorption properties of multiferroic BFO/epoxy resin composites with different weight percentage (wt%) of BFO fillers of various thicknesses were investigated. The BFO powders were synthesized using high energy ball milling (HEBM) and sintered at 775 °C in a furnace with an ambient air condition. The sintered BFO powders with different weight ratios (50 wt%, 60 wt% and 70 wt%) were mixed with epoxy resin as a matrix to form a composite with thicknesses of 1, 2 and 3 mm. Phase identification, grain size and morphology, magnetic and microwave absorption properties of prepared samples were characterized. The absorption performances of samples were measured in the frequency range of 8–18 GHz. As a result, the compressed BFO powders and BFO/epoxy resin composites with 50–70 wt% BFO filler showed dual-band microwave absorption resonance behavior. The best performances were demonstrated by a 3 mm thick BFO70 composite sample which exhibited a primary reflection loss (RL1) of −26.0 dB at 9.1 GHz and a secondary reflection loss (RL2) of −40.5 dB at 11.3 GHz, along with an associated −10 dB bandwidth of 1.31 GHz. The minimum reflection loss (RL) peaks were shifted to a lower frequency as the thicknesses were increased due to theλ4 condition. Theoretical studies on the absorbing wave mechanism reveal a unique combination of dielectric loss relaxations and antiferromagnetic resonance effects in the BFO absorbers.