Murizam Darus
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Preferred name
Murizam Darus
Official Name
Murizam, Darus
Alternative Name
Murizam, D.
Darus, M.
Darus, Murizam
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Scopus Author ID
55560769800
Researcher ID
GBJ-8265-2022

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  • Publication
    Phase formation and microstructure analyses of La0.6Sr0.4CoO3-δ-BaCe0.54Zr0.36Y0.1O2.95composite material prepared by solid state mixing method
    (IOP Publishing, 2020)
    Abdullah Abdul Samat
    ;
    Muhammad Syafiq Amsyar Ahmad Pisor
    ;
    Meor Ahmad Faris Meor Ahmad Tajudin
    ;
    Nafisah Osman
    ;
    Mohd Al-Hafiz Mohd Nawi
    ;
    Murizam Darus
    ;
    Nurul Akidah Baharuddin
    A composite material of La0.6Sr0.4CoO3-δ-BaCe0.54Zr0.36Y0.1O2.95 (LSC-BCZY) was prepared by mixing sol-gel derived LSC and BCZY powders in different weight percentage (wt%) ratio of LSC to BCZY (LSC:BCZY). The prepared composite powders were denoted as S1 (30:70), S2 (50:50) and S3 (70:30). The powders were characterized by an X-ray diffractometer (XRD), a Brunauer-Emmett-Teller (BET) surface area and porosity analyzer and a scanning electron microscope (SEM) equipped with an energy dispersive X-ray (EDX) spectrometer. XRD analysis confirmed that all of the powders were not pure enough due to the presence of impurity phases such as barium carbonate (BaCO3) and strontium carbonate (SrCO3) and unknown phases. S1 powder has the highest amount of impurity phases (81.19 %) and the largest BET surface area (4.82 m2 g−1). All of the powders formed typical clump-like network structure as proven by SEM analysis. EDX analysis revealed that the elemental compositions of La, Sr and Zr were deviated from their nominal mole fractions in all powders due to the Zr-rich clusters formation. The results indicate that the formation of pure and homogenous LSC-BCZY composite powder prepared by solid state mixing method requires further modification and improvement of the preparation method.
  • Publication
    Thermal decomposition, phase formation and microstructure analysis of surfactant assisted sol-gel derived La₀.₆Sr₀.₄CoO₃-δ material
    (IOP Publishing, 2020)
    Abdullah Abdul Samat
    ;
    Siti Hajar Alias
    ;
    Murizam Darus
    ;
    Mahendra Rao Somalu
    ;
    Nurul Akidah Baharuddin
    ;
    Nafisah Osman
    A single-phase of perovskite-type oxide material can be prepared at a processing temperature relatively lower than 1000 °C through a sol-gel method. However, it is affected by the nature of chemical additives employed during the synthesis process. In the present work, sol-gel derived lanthanum strontium cobaltite, La₀.₆Sr₀.₄CoO₃-δ (LSC64) material is prepared using various non-ionic surfactants namely polyoxyethylene (10) oleyl ether (Brij-97), polyoxyethylene octyl phenyl ether (Triton-X-100) and polyoxyethylene (20) sorbitan monooleate (Tween-80). The prepared powders of the LSC material is subsequently subjected to the thermal decomposition, phase formation and microstructure analysis by a thermal gravimetric analyzer, an X-ray diffractometer and a scanning electron microscope (SEM), respectively. The as-synthesized powders are calcined at different temperatures based on the thermal gravimetric analysis results. X-ray diffractometer results reveal that all of the calcined powders consist of more than 90 % perovskite phase of LSC64 and other secondary phases such as cobalt oxide, lanthanum oxide and strontium carbonate. The Brij-97-based and Tween-80-based calcined powders have morphology of typical clump-like network structure, while the Triton-X-100-based calcined powder has morphology of flake-like network structure.
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