Yazar "Shirsath, Sagar E." seçeneğine göre listele

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    Impact of CoFe1.98Nb0.02O4 phase on the structural, morphological, and dielectric properties of barium titanate material
    (Elsevier, 2023) Slimani, Yassine; Almessiere, Munirah A.; Shirsath, Sagar E.; Hannachi, Essia; Baykal, Abdulhadi; Alwadai, Norah; Alshatwi, Manar S.
    In this work, composite materials of BaTiO3/CoFe1.98Nb0.02O4 with desirable physical properties were developed. Magnetic CoFe1.98Nb0.02O4 and dielectric BaTiO3 phases were initially prepared via hydrothermal and sol-gel methods, respectively. Next, diverse materials of (100-x)% BaTiO3 + x% CoFe1.98Nb0.02O4 (x = 0, 2, 5, 10, 20, and 100 %) were developed using a solid-state reaction. The development of biphasic materials is confirmed through X-ray diffraction (XRD) and energy dispersive X-rays (EDX) analyses. Scanning electron microscope (SEM) observations indicated the existence of dissimilar particles in terms of shape and size, which belong to CoFe1.98Nb0.02O4 and BaTiO3 phases. The variations of dielectric constant and loss tangent were also investigated at ambient temperature in a frequency range of 100 to 106 Hz. Low values of dielectric loss tangent lesser than 1 are observed for different composites (i.e., x = 2, 5, 10, and 20 %). More specifically, composite materials with x >= 5% displayed very low dielectric loss tangent (below 0.1) along with good stability over the whole range of frequency. The obtained results indicated that these composite products could be suitable for high-frequency electromagnetic device applications.
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    Impact of magnetic spinel ferrite content on the structure, morphology, optical, and magneto-dielectric properties of BaTiO3 materials
    (Walter De Gruyter Gmbh, 2023) Slimani, Yassine; Meena, Sher Singh; Shirsath, Sagar E.; Hannachi, Essia; Almessiere, Munirah A.; Baykal, Abdulhadi; Sivakumar, Rengasamy
    In this study, the influence of magnetic content of NiFe1.93Dy0.07O4 spinel ferrite on the structural, morphological, optical, and magneto-dielectric properties of BaTiO3 materials was investigated. NiFe1.93Dy0.07O4 magnetic nanoparticles and BaTiO3 dielectric materials were firstly synthesized using the hydrothermal method and sol-gel auto-combustion route, respectively. Then, different contents of the magnetic nanoparticles were added to BaTiO3 to form a series of BaTiO3/(NiFe1.93Dy0.07O4)(x) samples (abbreviated as BTO/(NDFO)(x)) with x = 0, 2, 5, 10, 20, and 100 %. The analysis of the structure via X-ray diffraction (XRD) technique revealed a transformation from a tetragonal structure for the pristine BTO sample to a cubic structure upon the inclusion of magnetic nanoparticles. The morphological observations and chemical composition analyses via scanning electron microscope (SEM) coupled with EDX system showed the successful formulation of biphasic products. The optical properties were investigated, and it was found that the inclusion of the magnetic phase diminishes the bandgap energy (E-g) of final BTO/(NDFO)(x) samples. Furthermore, vibrating sample magnetometer (VSM) was used to investigate the magnetization properties. The values of saturation magnetization (M-S) and remanent (M-r) magnetization are rising with the increase of magnetic phase content. However, the coercivity (H-c) does not show a regular variation with the increase of NDFO content. The dielectric properties were also investigated for different BaTiO3/(NiFe1.93Dy0.07O4)(x) samples. The obtained results showed that the real permittivity (epsilon') and dielectric tangent loss (tan delta) increased with increasing temperature. Remarkably, the addition of magnetic content provokes a reduction in tan delta values compared to the pristine BTO sample. The lowest values of tan delta and highest frequency stability were noticed in the sample added with 10 % of magnetic phase. The impedance and modulus were also determined and discussed.