A5101883092- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Dielectric properties of ceramics
- Magnetic and transport properties of perovskites and related materials
- Conducting polymers and applications
- Transition Metal Oxide Nanomaterials
- Semiconductor materials and devices
- Gas Sensing Nanomaterials and Sensors
- Silicon Nanostructures and Photoluminescence
- Nanowire Synthesis and Applications
- Electrocatalysts for Energy Conversion
- Magnetic Properties and Synthesis of Ferrites
- Graphene research and applications
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- ZnO doping and properties
- Glass properties and applications
- Supercapacitor Materials and Fabrication
- Electrochemical Analysis and Applications
- Chalcogenide Semiconductor Thin Films
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Non-Invasive Vital Sign Monitoring
- Catalytic Processes in Materials Science
- Crystallography and molecular interactions
National Institute of Technology Durgapur
2015-2024
Institute for Plasma Research
2024
University of Calcutta
2017-2022
Sidho Kanho Birsa University
2022
Jadavpur University
1993-2016
Bhabha Atomic Research Centre
2013-2014
University of California, Berkeley
2008-2009
Indian Association for the Cultivation of Science
2005-2009
Lawrence Berkeley National Laboratory
2008
Indian Institute of Science Bangalore
2006-2007
We report a photovoltaic effect in ferroelectric BiFeO3 thin films. The all-oxide heterostructures with SrRuO3 bottom and tin doped indium oxide top electrodes are characterized by open-circuit voltages ∼0.8–0.9 V external quantum efficiencies up to ∼10% when illuminated the appropriate light. Efficiencies at least an order of magnitude larger than maximum efficiency under sunlight (AM 1.5) thus far reported for ferroelectric-based devices. dependence measured voltage on film thickness...
The optical properties of epitaxial BiFeO3 thin films have been characterized in the visible range. Variable temperature spectra show an absorption onset near 2.17eV, a direct gap (2.667±0.005eV at 300K), and charge transfer excitations higher energy. Additionally, we report photoconductivity under illumination from 100mW∕cm2 white light source. A correlation is observed between magnitude postgrowth cooling pressure. Dark conductivities increased by order when comparing cooled 760 0.1Torr....
Improvements in magnetodielectric and multiferroic properties are essential for visualizing the real application of multiferroics, precisely, BiFeO3 (BFO). An enhancement has been achieved chemically prepared nanocrystalline BFO by virtue Sm doping. The X-ray diffraction study confirms growth single phase which corroborates TEM observation. magnetic delineates ferromagnetic behavior Sm-doped samples even at room temperature, is absent pristine samples. Surprisingly, a few orders magnitude...
We have synthesized yttrium-doped bismuth ferrite nanoparticles through a modified Pechini technique. X-ray diffractometer, transmission electron microscope (TEM) and ultraviolet–visible spectrophotometer (UV–Vis) probes been utilized to characterize the nanoparticles. Average particle size estimated from TEM found be 29 nm for Bi0.99Y0.01FeO3 samples. The band gap of prepared BFO BYFO varies 1.97 2.29 eV, that is, within visible range sunlight. This property these can in photo catalytic...
The higher values of magneto-dielectric coupling is observed in flexible multiferroic polyvinylidene fluoride (PVDF) nanocomposites doped with nickel ferrite (NFO) nanoparticles.
From the measurement of dielectric, ferroelectric, and magnetic properties, we observe simultaneous ferroelectric transitions around ∼600 K in orthorhombic LuFeO3. We also suppression remanent polarization by ∼95% under a field ∼15 kOe at room temperature. The extent increases monotonically with field. These results show that even LuFeO3 is temperature multiferroic type-II variety exhibiting quite strong coupling between magnetization polarization.
Effect of yttrium doping on the electrical transport properties sol-gel prepare nanocrystalline BiFeO3 was investigated. A comprehensive state-of-the art sophisticated instruments like x-ray diffraction, differential thermal analyzer, field emission scanning electron microscope, and HRTEM were utilized to characterize nanoparticles. It observed that values dc activation energy calculated from Arrhenius relation increase with content. The variation ac conductivity frequency temperature...
Multiferroic (Y, Mn) substituted BiFeO3 had been synthesized by a facial sol–gel method. The single phase polycrystalline nature of samples was confirmed from X-ray diffraction pattern. average particle size estimated to be around 30–32 nm transmission electron microscopy. magnetic properties codoped nanoparticles studied using Bloch equation and the value constant found much larger than usual ferromagnetic materials. Coercivity values for different temperature is used calculate blocking lie...
Searching for materials and creating promising functionalities are the main driving force behind most of studies in area science condensed matter physics. The development advanced multiferroic by utilizing phenomenon magnetodielectric effect provides great prominence toward fabrication next-generation nonvolatile memory devices. We have observed a property at room temperature first time sol–gel-derived nanocrystalline bismuth-doped nickel ferrite. Nickel ferrite, although owning traditional...
A series of CO2-promoted Cu(II) coordination polymers in different environments has been synthesized. The molecular description and properties the four complexes have investigated by CHN, MS, UV-VIS, IR, PXRD, TEM, SQUID, SC-XRD, NLDFT, electrical property characterizations. Single crystal X-ray structure determination [Cu(bpy)(C2O4)]n (1) [Cu(2-AMP)2(C2O4)]n (2) depicts their polynuclearity [bpy = 2,2'-bipyridine, 2-AMP 2-aminopyridine; is a cleaved ligand starting L1=...
Improvement of the multiferroic properties bismuth ferrite is essential for its practical application and commercialization in growing field spintronics.