A5018968785- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Magnetic Properties and Synthesis of Ferrites
- Iron oxide chemistry and applications
- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Rare-earth and actinide compounds
- ZnO doping and properties
- Microwave Dielectric Ceramics Synthesis
- Gas Sensing Nanomaterials and Sensors
- Magnetic properties of thin films
- Electronic and Structural Properties of Oxides
- Advanced ceramic materials synthesis
- Catalytic Processes in Materials Science
- Transition Metal Oxide Nanomaterials
- Magnetic Properties and Applications
- Chalcogenide Semiconductor Thin Films
- Magnetic Properties of Alloys
- Physics of Superconductivity and Magnetism
- Magneto-Optical Properties and Applications
- Minerals Flotation and Separation Techniques
- Theoretical and Computational Physics
- Catalysis and Oxidation Reactions
- Zeolite Catalysis and Synthesis
- Electromagnetic wave absorption materials
Johns Hopkins University
2024
Savitribai Phule Pune University
2004-2015
Aoyama Gakuin University
2007
National Chemical Laboratory
1996-2006
Cochin University of Science and Technology
2001-2002
Gulbarga University
2001
ChemDiv (United States)
1987
Tata Institute of Fundamental Research
1972-1981
Australian National University
1979
In Mn1−xZnxFe2O4 (x=0 to 1) nanosize particles prepared through hydrothermal precipitation we observe a decrease in particle size from 13 4 nm with increasing Zn concentration 0 1. The lattice constant, a, for all Mn/Zn concentrations is found be less than that the corresponding bulk values. At specific compositions within x=0.35 and 0.5, temperature dependence of magnetization exhibits cusp-like behavior below at which nanoparticles undergo ferri- para-magnetic transition (Tc). Curie...
Analysis of the irreversible field-cooled (FC) and zero-field-cooled (ZFC) magnetic susceptibilities one ferrimagnetic three ferromagnetic systems, measured at different applied fields, shows that irreversibility indicated by difference between FC ZFC arises from anisotropy. The two are related to each other through coercivity which is a measure susceptibility can be calculated (or vice versa) coercivity.
Abstract Plasmonic nanomaterials bearing targeting ligands are of great interest for surface‐enhanced Raman scattering (SERS)‐based bioimaging applications. However, the practical utility SERS‐based imaging strategies is hindered by lack a straightforward method to synthesize highly sensitive SERS‐active nanostructures with high yield and efficiency. In this work, leveraging DNA origami principles, first‐in‐class design plasmonically coupled nanoprobe targeted cancer (SPECTRA) reported. The...
Transport properties of ${\mathrm{La}}_{0.75}{\mathrm{Ca}}_{0.25}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}{\mathrm{O}}_{3+y}$ ceramics are examined for ``$x$'' values from 0 to 0.05. Dramatic changes observed in the resistivity and its temperature dependence as increases above about 0.04. Temperature-dependent M\"ossbauer spectroscopy magnetization studies also performed. These data suggest that transport this system necessarily involves quasiparticle excitation association with...
Organically capped zinc sulfide nanoparticles doped with different manganese concentrations were prepared under similar conditions. Only the doping concentration was varied. Photoluminescence and electron-spin-resonance (ESR) investigations show some new results. At an optimum of Mn a maximum in photoluminescence is reached, whereas quenching occurs at higher concentrations. ESR that spectra arise due to four contributions ions, viz., (1) $\mathrm{Mn}{(S}_{I})$ tetrahedral cationic...
A ferromagnetic transition below 280 K is observed in the temperature variation of magnetization, measured using high magnetic fields, for samples ${\mathrm{LaMn}}_{0.5}{\mathrm{Ni}}_{0.5}{\mathrm{O}}_{3}$ synthesized by high-temperature solid-state reaction method. On other hand, two well-defined transitions, at $\ensuremath{\sim}150$ and $\ensuremath{\sim}280\mathrm{K},$ are low-field zero-field-cooled (ZFC) magnetization ${(M}_{\mathrm{ZFC}})$ measurements on these samples, indicating...
The magnetic behaviour of at low fields has been studied by ac susceptibility, and field cooled (FC) zero (ZFC) magnetization measurements. cluster-glass-like the compound is found to originate from its magnetocrystalline anisotropy as similar properties are observed for ferromagnetic systems also. cluster glass freezing temperature dependence, irreversibility between FC ZFC curves, shape low-field susceptibility etc related magnitude variation coercivity which a measure anisotropy, ratio...
High-temperature susceptibility measurements have indicated that the spin states of Mn and Co are different in two phases ferromagnetic oxide ${\mathrm{LaMn}}_{0.5}{\mathrm{Co}}_{0.5}{\mathrm{O}}_{3}.$ ions present their trivalent state as high-spin ${\mathrm{Mn}}^{3+}$ low-spin ${\mathrm{Co}}^{3+}$ high-${T}_{c}$ ${(T}_{c}\ensuremath{\approx}225 \mathrm{K})$ phase compound whereas low-${T}_{c}$ ${(T}_{c}\ensuremath{\approx}150 \mathrm{}\mathrm{K})$ phase, they ${\mathrm{Mn}}^{4+}$...
Active powders of Ni–Zn ferrite were synthesized by soft chemical approaches and extensively characterized using x-ray diffraction, scanning electron micrographs, vibrating sample magnetometer, resistivity, permeability/loss factor techniques. The variation in the sintering conditions established a useful microstructure–magnetic permeability correlation.
Microstructure and magnetic properties of monodispersed pseudocubic trapezoidal particles with varying sizes prepared through the hydrothermal precipitation route are reported. The coercivity for was similar to that reported values. For particles, however, is unusually high (∼6 kOe) as compared maximum value (3 in literature. Detailed microstructural analysis revealed a well-defined shape are, fact, polycrystalline. its variation particle size correlated internal nanostructure particles.