P. Neelima

@kmit.ac.in

Assistant Professor in Department of Physics
Keshav Memorial Institute of Technology

P. Neelima


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https://researchid.co/sneelima.2710

EDUCATION

Ph D Physics

RESEARCH, TEACHING, or OTHER INTERESTS

Materials Science, Electronic, Optical and Magnetic Materials
6

Scopus Publications

78

Scholar Citations

4

Scholar h-index

3

Scholar i10-index

Scopus Publications

  • Impact of Process Parameters and Dopant Concentration on Structural, Magnetic, and Dielectric Properties of Dysprosium-doped Nickel-Zinc Ferrites Synthesized by Microwave Hydrothermal Method
    T. Ramesh, P. Usha, P. Neelima, N. Pavan Kumar
    Ecs Journal of Solid State Science and Technology, 2023
    This study aims to investigate the impact of substituting Dy3+ ions on the structural, magnetic and dielectric properties of Nickel Zinc (Ni-Zn) ferrites, which have the chemical formula Ni0.5Zn0.5DyxFe2-xO4 (where x = 0, 0.01, 0.03, 0.05, 0.07, and 0.09). These ferrites were synthesized using a microwave hydrothermal technique with different process parameters. Structural characterization of the synthesized powders was carried out using X-ray diffraction (XRD) and Fourier transformation infrared spectroscopy (FTIR). The XRD analysis confirmed the presence of a pure spinel phase for Dy concentrations (x) up to 0.05. However, when x ≥ 0.07, an additional orthoferrite phase (DyFeO3) was observed along with the spinel phase. FTIR spectra revealed a shift in low-frequency wave numbers due to Dy3+ ion substitution. The size and morphology of the synthesized powder particles were examined using field emission scanning electron microscopy (FESEM). The powder compacts were sintered using microwave processing at 900 °C for 40 min. The increase in dc. resistivity is observed with an increase in Dy3+ concentration, mainly due to the change in the hopping mechanism with the substitution concentration. Dielectric properties such as dielectric constant and loss are measured in the frequency range of 100 Hz to 1.8 GHz. The high value of dielectric constant and loss observed in the low-frequency region compared to the high-frequency region. Maxwell’s Wagner model and ‘Koop’s theory explains the variation in dielectric properties with the frequency. The magnetic hysteresis loops were measured at different temperatures and observed to enhance the low-temperature magnetic properties compared to room temperature. The results suggest that the magnetic and dielectric properties of the investigated samples can be adjusted by varying the concentration of Dy3+ ions, providing the ability to tailor these properties according to specific application requirements.
  • Effect of Dy3+ substitution on structural and magnetodielectric properties of Mn–Zn ferrites synthesized by microwave hydrothermal method
    P. Neelima, P. Usha, T. Ramesh, Kiran Kumar Ganta
    Journal of Materials Science Materials in Electronics, 2023
  • Ni0.48Cu0.12Zn0.4Fe2O4+ paraformaldehyde nanocomposites as microwave absorbent dominant materials
    P. Raju, A. Thirupathi, P. Neelima, M. Kanakadurga
    Solid State Communications, 2022
  • Effect of sintering temperature on the magnetodielectric performance of nickel ferrite
    T. Ramesh, V. Madhavi, P. Neelima, K. Nagendra Kumar, N. Bakthavatchala Reddy, Grigory V. Zyryanov
    Aip Conference Proceedings, 2022
    Nickel ferrite (NiFe2O4) nanopowder has been synthesized by a sol-gel auto-combustion process and further sintered at various sintering temperatures. The sintered samples were characterized by XRD, SEM and VSM. Enhancement of apparent density of the sample has been observed with the increase in sintering temperature and has a great influence on the magnetic and dielectric properties of NiFe2O4. The SEM results reveal that the grain size increases with increasing sintering temperature. The electrical resistivity decreases and the dielectric constant increases with increasing sintering temperature has been observed. The magnetic studies shown that the ferrimagnetic behaviour increases with sintering temperature. These results suggest that sintering temperature has a prominent effect on the magnetodielectric properties.
  • Enhanced microwave absorption properties of Ni0.48Cu0.12Zn0.4Fe2O4 + polyaniline nanocomposites
    P. Raju, P. Neelima, G. Neeraja Rani, M. Kanakadurga
    Journal of Physics and Chemistry of Solids, 2021
  • Structural and microwave behavior of Dy3+-substituted Ni0.5Zn0.5DyxFe2-xO4 ferrites
    P. Neelima, T. Ramesh, P. Raju, S. R. Murthy
    Journal of Materials Science Materials in Electronics, 2021

RECENT SCHOLAR PUBLICATIONS

  • Impact of process parameters and dopant concentration on structural, magnetic, and dielectric properties of dysprosium-doped nickel-zinc ferrites synthesized by microwave …
    T Ramesh, P Usha, P Neelima, NP Kumar
    ECS Journal of Solid State Science and Technology 12 (10), 103016 , 2023
    2023
    Citations: 8
  • Effect of Dy 3+ substitution on structural and magnetodielectric properties of Mn–Zn ferrites synthesized by microwave hydrothermal method
    P Neelima, P Usha, T Ramesh, KK Ganta
    Journal of Materials Science: Materials in Electronics 34 (8), 758 , 2023
    2023
    Citations: 21
  • Ni0. 48Cu0. 12Zn0. 4Fe2O4+ paraformaldehyde nanocomposites as microwave absorbent dominant materials
    P Raju, A Thirupathi, P Neelima, M Kanakadurga
    Solid State Communications 351, 114790 , 2022
    2022
    Citations: 3
  • Effect of sintering temperature on the magnetodielectric performance of nickel ferrite
    T Ramesh, V Madhavi, P Neelima, KN Kumar, NB Reddy, GV Zyryanov
    AIP Conference Proceedings 2390 (1), 020064 , 2022
    2022
    Citations: 1
  • Enhanced microwave absorption properties of Ni0. 48Cu0. 12Zn0. 4Fe2O4+ polyaniline nanocomposites
    P Raju, P Neelima, GN Rani, M Kanakadurga
    Journal of Physics and Chemistry of Solids 154, 110048 , 2021
    2021
    Citations: 25
  • Structural and microwave behavior of Dy 3+ -substituted Ni 0.5 Zn 0.5 Dy x Fe 2-x O 4 ferrites
    P Neelima, T Ramesh, P Raju, SR Murthy
    Journal of Materials Science: Materials in Electronics 32 (2), 1729-1740 , 2021
    2021
    Citations: 18
  • Effect of Dy3+ substitution on microwave behaviour of nanocrystalline Mn-Zn Ferrite
    P Neelima, SR Murthy
    Advanced Materials Proceedings 3 (7), 464-468 , 2018
    2018
    Citations: 2

MOST CITED SCHOLAR PUBLICATIONS

  • Enhanced microwave absorption properties of Ni0. 48Cu0. 12Zn0. 4Fe2O4+ polyaniline nanocomposites
    P Raju, P Neelima, GN Rani, M Kanakadurga
    Journal of Physics and Chemistry of Solids 154, 110048 , 2021
    2021
    Citations: 25
  • Effect of Dy 3+ substitution on structural and magnetodielectric properties of Mn–Zn ferrites synthesized by microwave hydrothermal method
    P Neelima, P Usha, T Ramesh, KK Ganta
    Journal of Materials Science: Materials in Electronics 34 (8), 758 , 2023
    2023
    Citations: 21
  • Structural and microwave behavior of Dy 3+ -substituted Ni 0.5 Zn 0.5 Dy x Fe 2-x O 4 ferrites
    P Neelima, T Ramesh, P Raju, SR Murthy
    Journal of Materials Science: Materials in Electronics 32 (2), 1729-1740 , 2021
    2021
    Citations: 18
  • Impact of process parameters and dopant concentration on structural, magnetic, and dielectric properties of dysprosium-doped nickel-zinc ferrites synthesized by microwave …
    T Ramesh, P Usha, P Neelima, NP Kumar
    ECS Journal of Solid State Science and Technology 12 (10), 103016 , 2023
    2023
    Citations: 8
  • Ni0. 48Cu0. 12Zn0. 4Fe2O4+ paraformaldehyde nanocomposites as microwave absorbent dominant materials
    P Raju, A Thirupathi, P Neelima, M Kanakadurga
    Solid State Communications 351, 114790 , 2022
    2022
    Citations: 3
  • Effect of Dy3+ substitution on microwave behaviour of nanocrystalline Mn-Zn Ferrite
    P Neelima, SR Murthy
    Advanced Materials Proceedings 3 (7), 464-468 , 2018
    2018
    Citations: 2
  • Effect of sintering temperature on the magnetodielectric performance of nickel ferrite
    T Ramesh, V Madhavi, P Neelima, KN Kumar, NB Reddy, GV Zyryanov
    AIP Conference Proceedings 2390 (1), 020064 , 2022
    2022
    Citations: 1