A5101513882- Multiferroics and related materials
- Magnetic and transport properties of perovskites and related materials
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Ferroelectric and Piezoelectric Materials
- Advanced Condensed Matter Physics
- Phase Equilibria and Thermodynamics
- Chemical Thermodynamics and Molecular Structure
- Electronic and Structural Properties of Oxides
- Gas Dynamics and Kinetic Theory
- Solid-state spectroscopy and crystallography
- Acoustic Wave Resonator Technologies
- Advancements in Solid Oxide Fuel Cells
- Quantum, superfluid, helium dynamics
- Thermal and Kinetic Analysis
- Magnetic Properties and Synthesis of Ferrites
- Thermal Expansion and Ionic Conductivity
- Supramolecular Self-Assembly in Materials
- Advanced Sensor and Energy Harvesting Materials
- Infrastructure Maintenance and Monitoring
- Dielectric materials and actuators
- Nonlinear Optical Materials Research
- Concrete Corrosion and Durability
- Life Cycle Costing Analysis
- Field-Flow Fractionation Techniques
Banaras Hindu University
2022
Indian Association for the Cultivation of Science
1969-2018
The Ohio State University
2017
Our thorough synchrotron diffraction studies provide a clue on the origin of ferroelectricity in SmCrO3. Careful observation demonstrates that polar order develops paramagnetic state. Rietveld refinement data confirms emergence is correlated with structural transformation from centrosymmetric Pbnm to non-centrosymmetric Pna21 space group distorted orthorhombic structure. Rotations CrO6 octahedra and Sm displacement are proposed be order, which extended over wide temperature range increases...
We report ferroelectricity in antiferromagnetic HoCrO<sub>3</sub> with a reasonably large value of spontaneous electric, which appears due to structural transition from <italic>Pbnm</italic> nonsymmetric <italic>Pna</italic>2<sub>1</sub> space group.
We report a diffuse phase transition (extending over finite temperature range of ∼50 K) in sol-gel derived nanoparticles (∼25 nm) the ferromagnetic double perovskite La(2)NiMnO(6). The macroscopic polarization (P-E hysteresis loop), validity Vogel-Fulcher relation and high dielectric permittivity (∼9 × 10(2)) confirm relaxor ferroelectric phenomena these magnetic nanoparticles. Compared to corresponding bulk sample, appreciably large enhancement magnetocapacitive effect (MC ∼ 30%) is...
Magnetic, dielectric, and ac conductivity as well room temperature structural Raman studies are performed on double perovskite Dy2NiMnO6. The crystal structure of the compound adopts monoclinic P21/n space group, where alternate Mn Ni distorted octahedral arranged in anti-phase a− b+ order Glazer notation. Magnetization show two magnetic transitions around 100 K 20 which related to ordering transition rare earth cations moment, respectively. Temperature dependent dielectric permittivity...
We report significantly large magnetocapacitance (∼32%) close to room temperature in Cr2O3 film fabricated using pulsed laser deposition technique. Magnetic hysteresis loop exhibits typical signature of a soft ferromagnetic character at contrast that observed antiferromagnetic bulk counterpart. The value saturation magnetization (MS) is with MS≈1.0μB temperature. A significant strain ascribed the lattice mismatch suggested for occurrence ferromagnetism and correlated
Magnetite films are grown on Si(100) substrate using pulsed laser deposition technique. The is performed at three fixed oxygen pressures of 0.4 × 10−6, 4.0 and 10 10−6 Torr keeping other conditions fixed. Raman x-ray photoemission spectroscopies confirm formation single magnetite phase for the first two a mixed composed hematite highest pressure. A trivial change in stoichiometry found crucial multiferroic orders room temperature below charge ordering temperature. Possible mechanisms driven...
A four-tube all-glass trennschaukel or swing separator, having several new features has been designed. Bulbs have used at the hot and cold ends of each tube to increase considerably gas space in isothermal regions. Thermocouples inserted into top bottom end volumes measure exact upper lower temperatures. Two dummy tubes also placed on side effective arrangement eliminate dilution sample from rocking arrangement. This apparatus successfully employed thermal-diffusion factors He–Ne, Ar–N2,...
While the influence of alkyl chain length and headgroup size on self-assembly behaviour has been well-established for simple surfactants, rational control over pH- concentration-dependent in stimuli responsive peptides remains an elusive goal. Here, we show that different amphiphilic can have similar phase diagrams, providing relative strengths attractive repulsive forces are balanced. Using palmitoyl-YYAAEEEEK(DO3A:Gd)-NH2 palmitoyl-YAAEEEEK(DO3A:Gd)-NH2 as controls, reducing hydrophobic...
The composition dependence of the thermal-diffusion factor H2−He system has been measured at temperatures 155.8° and 241.5°K by a two-bulb apparatus. measurements show similar dip in α vs mole fraction H2 plot as observed Ghosh, Batabyal, Barua earlier. Two peculiarities ha noticed these measurements: (1) percentage which occurs shifts with change T̄ (2) extent decreases decrease T̄. An attempt made to interpret data from semitheoretical considerations.
Steady-state separation factors of 1:1 carbon dioxide—nitrous oxide mixture at mean temperatures 363°, 401.5°, and 435.5°K pressures ranging from 0.30 to 0.95 atm have been measured by operating a coaxial thermal-diffusion column. It has found that the variation factor with pressure agrees qualitatively Furry—Jones' theory for isotopic mixtures. A detailed comparison experimental results made on Maxwellian Lennard-Jones (12:6) models values this polyatomic gas estimated.
We report multifunctional properties of the charge disproportionate correlated electronic system La0.5Ba0.5FeO3 synthesized by conventional solid state reaction route. The bulk sample undergoes semiconductor–metal like transition at TSM = 102 K showing appreciable magnetoresistance (∼20%) around even a low field (∼0.5 T). A crossover electrical conduction mechanism from Mott’s variable range hopping to small polaron occurs 210 K, well above TSM. Analysis transport, magnetic susceptibility,...
The thermal diffusion factor αT for a 1:1 mixture of He and CH3Cl has been measured by the two-bulb method at different temperatures ranging from 338°–530°K. composition dependence this system also studied 362.8°K. For temperature agreement between experimental calculated values is poor even when inelastic collisions are taken into account. theoretical curves run approximately parallel to each other over whole range. This probably means that do not play significant role in phenomenon system.
In this work, we have investigated the crystal structure, thermal, vibrational, microstructural, and electrical properties of Ta doped La2Mo2O9 oxide ion conductors. The Rietveld refinements on X-ray diffraction patterns confirm α phase similar to that undoped at room temperature. → β transition is confirmed by differential scanning calorimetry analysis. microcrystalline samples grain sizes ∼10 μm along with well-defined boundaries. infrared Raman spectra mainly consist MoO4 bands....
Abstract From specific heat, thermal expansion, and dielectric constant measurements between 150 300 K we have confirmed the low temperature phase transition in barium chloride dihydrate (BaCl2.2H2O) at 195 ± 1 K. This appears to be associated with local ordering (or displacements) of two water molecules crystal. A “pseudospin” type model is proposed explain mechanism. Key Words: BaCl2.2H2Oferroelasticheat capacitythermal expansion
<p>While the design life of a bridge is generally estimated to be around 100 years, an important component bridge, viz. expansion joints have much shorter service – typically between 10 20 years. Therefore, need replaced quite few times during bridge. The total cost ownership (TCO} product defined by sum all costs incurred owner at different stages, i.e., initial procurement and installation cost, regular inspection &amp; maintenance possible replacement involving engineering,...