DP

Dr. Ranjit Pattanayak

National Institute of Technology Raipur, Saraswati Degree Science College, Suddhananda Engineering And Research Centre

ORCID iD 0000-0003-0439-9146
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Summary of my Ph.D. work:

Four novel polycrystalline magnetoelectric composite systems: S1, S2, S3 and S4 having composition [90 wt% Na0.5Bi0.5TiO3 (NBT) - 10 wt% BaFe12O19 (BaM)] considering the variation of grain size of both the phases [NBT(Lg) - BaM(Lg)-[S1], NBT(Lg) - BaM(Sg)-[S2], NBT(Sg) - BaM(Lg)-[S3] and NBT(Sg) - BaM(Sg)-[S4] are successfully synthesized by using solid state reaction method. Here Lg is larger size (µm range) grain and Sg is smaller size (nm range) grain. The Rietveld refinement of X-ray diffraction pattern (XRD) confirms the pure phase formation of our desired systems. The SEM, FESEM, STEM and TEM images provide the information about the size, geometry and connectivity of grains of both the phases. The microstructural conduction mechanism and multiferroic behaviour are examined by complex impedance spectroscopy, PE loop, MH loop and magnetoelectric coupling (MEC) coefficient (αME).
From whole work, it has been concluded that, electric, magnetic and multiferroic properties of a single phase as well as composite systems can be tailored with the variation of grain size (as like substitution and doping). Many interesting results have been explored, to name of the few: (1) the [NBT (Sg)-BaM (Lg)] composite system has shown highest MEC as compared with others (which is explained with the help of connectivity scheme and momentum transfer mechanism). (2) Surprisingly the saturation magnetization (Ms) and coercive field (Hc) are drastically increased for the composites in which NBT phase is smaller grain size (which is explained by of inter-grain-exchange interaction). (3) From the microstructural conduction mechanism, it has been perceived that different interfaces (BaM-BaM, BaM-NBT and NBT-NBT) are activated at different temperature ranges of composite systems. It is also found that due to lack of connectivity between BaM-BaM and NBT-NBT interfaces, [90 wt% Na0.5Bi0.5TiO3-10 wt% BaFe12O19] system has shown Positive temperature coefficient resistance (PTCR) behaviour.

Research Interests:
 To synthesis and characterization of magnetoelectric nanoparticles for drugs delivery application.
 To investigate the effect of magnetic field on relaxor behaviour of modified Na0.5Bi0.5TiO3 systems by impedance spectroscopic technique for sensor applications.
 To investigate the Magnetoimpedance and Dzyaloshinskii-Moriya interaction in hexaferrite systems for potential application in magnetic sensors and spintronics devices.
 To fabricate BaFe12O19-Na0.5Bi0.5TiO3 heterostructure and study of its magnetoelectric property for potential application in opto-spintronic devices.
 To study the photo-catalytic activities of hexaferrite nano particles for west water treatment and hydrogen gas production.
Technical Expertise with:
 Material Growth Techniques:
 Solid State reaction
 Auto-Combustion Technique
 Sol Gel Method
 Analysis of Material Properties by Using of Data:
 X-Ray diffraction
 Field Emission Scanning Electron (FESEM) and Transmission Electron (TEM) Microscopy
 Raman Spectroscopy
 Complex Impedance Spectroscopy
 X-Ray Photo Electron spectroscopy
 Magneto-Impedance Spectroscopy

Employment

  • National Institute of Technology Raipur Asst. Professor (Part Time)
    2024 - Present
  • Saraswati Degree Science College Lecturer
    2018 - 2023
  • Suddhananda Engineering And Research Centre Asst. Professor
    2017 - 2018

Education

Education history is unavailable.

Projects & Funding

Projects & funding information is unavailable.

Publications (18)