Rozana Aina Maulat Osman
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Preferred name
Rozana Aina Maulat Osman
Official Name
Rozana Aina, Maulat Osman
Alternative Name
Osman, R. A.M.
Osman, A. Rozana
Maulat Osman, Rozana Aina
Osman, Rozana A.M.
Osman, R.
Osman, R. A.Maulat
Main Affiliation
Scopus Author ID
37261764900
Researcher ID
DXB-4277-2022

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  • Publication
    Impedance and modulus spectroscopy of polycrystalline Ba0.9995La0.0005TiO3for multilayer ceramic capacitor
    ( 2021-07-21)
    Tiong Yuan Tze
    ;
    Rozana Aina Maulat Osman
    ;
    Mohd Sobri Idris
    ;
    Ku Noor Dhaniah Ku Muhsen
    ;
    Nurul Izza Mohd Nor
    ;
    Wahab Y.A.
    ;
    Sagadevan S.
    ;
    Sebastian T.
    ;
    Arturo R.L.D.
    Ba0.9995La0.0005TiO3 ceramics prepared via solid-state reaction route was found to be phase pure at the final sintering temperature of 1300°C for 16 hours. The dielectric constant was varied from 1900 to 2800 from 10 Hz to 100 kHz. Impedance spectroscopy is a powerful technique to study the complexities of ceramic materials such as homogeneity and inhomogeneity of materials that being process during production of most electronic materials. An electronic ceramic component can be visualized as a grain, grain boundary and electrode system. Impedance spectroscopy is being widely used to separate out contribution of the bulk and the grain boundary to the overall equivalent circuit models. Fixed frequency plots of dielectric constant versus temperature for Ba0.9995La0.0005TiO3 ceramics shows typical perovskite response with Curie temperature, Tc about 115 °C and fit with the equivalent circuit which contributed by bulk and grain boundary response.
      1  35
  • Publication
    Carbon nanotube as electrode in film bulk acoustic wave resonator for improved performance
    ( 2020-01-08)
    Nurul Izza Mohd Nor
    ;
    Hasni A.H.M.
    ;
    Nazuhusna Khalid
    ;
    Rozana Aina Maulat Osman
    Electrode material is one of the important material in designing FBAR. Different electrode materials will have different characteristic and properties. The different in properties will also produce different performance such as the quality factor or electromechanical coupling coefficient (k2eff). Study has shown that carbon nanotube (CNT) has been used as electrode in the fabrication of FBAR. The result shows that CNT offers higher Q factor compare to metal electrode. Therefore, in this work it is focused to design the zinc oxide (ZnO) based on FBAR with carbon nanotube (CNT) and aluminium (Al) as electrode with frequencies range of 6 GHz to 8 GHz. Analysis shows that CNT has higher Q factor compared to Al where the highest Q factor of CNT recorded is 1543 while Al is 1268 at frequency of 8 GHz with thickness of 30 nm at resonance area of 50 μm × 50 μm. For FBAR operation at 6 GHz, CNT shows the highest Q factor of 1164 while Al is 876 at thickness of 30 nm at resonance area of 50 μm × 50 μm. CNT and Al at 7 GHz also show the highest Q factor at thickness of 30 nm with resonance area of 50 μm × 50 μm by 1341 and 993 respectively. On the other hand, in term of k2eff, Al has higher value of k2eff compare to CNT where for 6 GHz the highest value of Al recorded is 0.062 while CNT is 0.026 at thickness of 30 nm with resonance area of 50 μm × 50 μm. For 7 GHz the highest k2eff of Al achieved is 0.067 while CNT is 0.042 at thickness of 30 nm. For 8 GHz, the highest k2eff of Al achieved is 0.073 while CNT is 0.025 at thickness of 30 nm.
      6  18
  • Publication
    Dielectric and structural analysis of hexagonal and tetragonal phase BaTiO3
    ( 2020-01-08)
    Nurul Huda Yusoff
    ;
    Rozana Aina Maulat Osman
    ;
    Mohd Sobri Idris
    ;
    Ku Noor Dhaniah Ku Muhsen
    ;
    Nurul Izza Mohd Nor
    Barium titanate (BaTiO3) has been synthesized using conventional solid state reaction method at sintering temperatures of 1150°C and 1400°C. A single phase tetragonal perovkite BaTiO3 was observed at 1150°C and changed to hexagonal phase at 1400a°C. The result was confimed by using X-ray diffraction analysis. Hexagonal BaTiO3 exhibits almost linear dielectric constant value between 60 to 120, however the tetragonal phase shows a phase transition from tetragonal to cubic at 120a°C. The tetragonal phase BaTiO3 has the highest dielectric constant 6000 at Tc and 4000 at room temperature.
      15  33