Azreen Shafirah Binti Abdullah, <br/><br/>
Synthesis and characterization of  baco2 w-type hexaferrite with addition  of carbon black / 
Azreen Shafirah Binti Abdullah 
 - xii, 62 pages : _  illustrations ; 
<br/><br/> Faculty of Industrial Sciences and Technology 
<br/><br/>Final Year Report (Bachelor of Applied Science in Material Technology) -- Universiti Malaysia Pahang Al-Sultan Abdullah - 2025 
<br/><br/>Include bibliographical reference 
<br/><br/> Electronic devices contribute to electromagnetic wave interference causing electromagnetic  pollution that affects human health. Electromagnetic pollution was managed by the application of  microwave absorber material by controlling reflection loss. The low absorption, narrow  bandwidth, and impedance mismatch were related to the reflection loss. BaCo2Fe16O27 was doped  with carbon black to increase the absorption, broaden bandwidth, and enhance impedance  matching to improve the efficiency of absorption of the material. The BaCo2Fe16O27 was produced  by the solid-state method using the ball milling technique at 300 rpm for 12 hours and sintered at  1250 ℃ for 5 hours. Carbon black (10%, 20%, 30%, and 40%) was doped with BaCo2Fe16O27 to  fabricate composite material with thicknesses of 1 mm, 2 mm, and 3 mm. The structural,  microstructural, and absorption performance was characterized using X-ray Diffraction, Scanning  Electron Microscopy, and Vector Network Analyzer. The absorption performance was tested at  frequencies ranging from 8 to 18 GHz. The structural analysis confirmed the single-phase  formation of BaCo2Fe16O27 with an average crystallite size of 33.19 nm. The microstructural  showed spongy and irregularly grain-shaped samples. The reflection loss value increases with the  increase of the composition of carbon black improving electromagnetic wave absorption. By  varying the thicknesses and composition of carbon black, the microwave absorber material  achieved the effective value of reflection loss and frequency. The maximum reflection loss reached  about -27.42 dB at a frequency of 9.24 GHz when the thickness was 3 mm on 40% of carbon black  and was defined as an excellent absorber material. 
<br/><br/><label>ISBN: </label>THE0010459 (Local) 
<br/><br/><label>Subjects--Corporate Names: </label><br/>Faculty of Industrial Sciences and Technology--Dissertations
<br/><br/><label>Subjects--Topical Terms: </label><br/>Universities and colleges--Dissertations<br/>Theses--Dissertations