A5078065340- Ferroelectric and Piezoelectric Materials
- Multiferroics and related materials
- Acoustic Wave Resonator Technologies
- Microwave Dielectric Ceramics Synthesis
- Dielectric materials and actuators
- Innovative Energy Harvesting Technologies
- Advanced Sensor and Energy Harvesting Materials
- Rocket and propulsion systems research
- Vibration Control and Rheological Fluids
- Cold Atom Physics and Bose-Einstein Condensates
- Planetary Science and Exploration
- Theoretical and Computational Physics
- Quantum, superfluid, helium dynamics
- Quantum Mechanics and Non-Hermitian Physics
- Nuclear Physics and Applications
- Opinion Dynamics and Social Influence
- Industrial Automation and Control Systems
- Scientific Research and Discoveries
- Quantum chaos and dynamical systems
- Glass properties and applications
- Electronic and Structural Properties of Oxides
- Acoustic Wave Phenomena Research
- Quantum optics and atomic interactions
- Masonry and Concrete Structural Analysis
- Geophysics and Sensor Technology
Maulana Azad National Institute of Technology
2024
Indian Institute of Science Bangalore
1973-2023
Korea Institute of Materials Science
2023
Chandigarh University
2022
Jeju National University
2020
Bhabha Atomic Research Centre
2020
Addis Ababa University
1989
Magneto-mechano-electric (MME) generators are increasingly being investigated as a sustainable power source for Internet of Things (IoT) systems owing to their ability efficiently harvest electrical energy from stray magnetic field noise. However, be practical, this technology must achieve longer lifespan while maintaining high-power output and withstanding fluctuations. To address this, extensive numerical simulations experimental verifications have been performed amplify the...
Ferroelectric based piezoceramics exhibiting large electromechanical response are used as sensors, actuators, and transducers in wide-ranging applications spanning sectors like space, defense, medical diagnostics, etc. In general, the piezoelectric ferroelectric solid solutions is associated with a composition driven interferroelectric instability, commonly known morphotropic phase boundary (MPB). Here, we show that MPB not necessarily required to achieve equivalent to, or even more than...
Morphotropic phase boundary (MPB) and polymorphic ferroelectric solid solutions show enhanced electromechanical response are sought after as actuator transducer materials. Compared to others, the lead-free piezoelectric solution ${\mathrm{N}}_{0.5}\mathrm{B}{\mathrm{i}}_{0.5}\mathrm{Ti}{\mathrm{O}}_{3}\ensuremath{-}\mathrm{BaTi}{\mathrm{O}}_{3}$ stands out in two important respects: (i) low coefficients $(\ensuremath{\sim}200\phantom{\rule{0.16em}{0ex}}\mathrm{pC}/\mathrm{N})$ (ii) anomalous...
Recently, an ultrahigh piezoelectricity (longitudinal piezoelectric coefficient d33 ~ 1500 pC/N) was reported in polycrystalline specimens of Sm-modified relaxor ferroelectric system Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN–PT) [Li et al, Nat. Mater 17, 349 (2018)]. Here, we examine the factors associated with this anomalous phenomenon by carrying out a comparative structural, dielectric, and impedance spectroscopy on Sm-free 0.71PMN-0.29PT (piezoelectric 380 its Sm modified counterpart (d33 1160 pC/N)....
We numerically investigate the phase diagram of giant-piezoelectric $(1\ensuremath{-}x)\mathrm{Ba}({\mathrm{Zr}}_{0.2}{\mathrm{Ti}}_{0.8}){\mathrm{O}}_{3}\ensuremath{-}x({\mathrm{Ba}}_{0.7}{\mathrm{Ca}}_{0.3}){\mathrm{TiO}}_{3}$ system, treating ions either as classical objects (via Monte Carlo or CMC simulations) quantum mechanically path-integral PI-QMC simulations). It is found that not only provides a better agreement with available experimental data for temperature-composition diagram,...
Technological advancement is generating a heap of electronic waste and has put onus on the production wearable systems to be environmentally sustainable without compromising much with their functionality. Many such employ flexible piezo sensors for force sensing and/or energy harvesting. In this work, we demonstrate feasibility fabricating piezoelectric harvester sensor by reinforcing biodegradable polymer polycaprolactone (PCL) powders ferroelectric-based piezoceramic...
Polymer-piezoceramic 0–3 composites combine the flexibility of polymers and excellent piezoelectric properties ferroelectric based ceramics. While grain size ceramic powder is one important considerations in fabrication such composites, a correlation relating poling field induced structural changes its possible influence on overall response composite still lacking. In this paper, we examine issue piezo-composite comprising powders low-lead alloy (x)Bi(Ni1/2Zr1/2O3-(1-x)PbTiO3 proximity...
Polymer-piezoceramic composites show mutual properties of piezoceramics and polymers that can be efficiently utilized in energy harvesting applications. Here we fabricated 0-3 composite films using high-performance low-lead piezoceramic (x)Bi(Ni1/2Zr1/2)O3-(1-x)PbTiO3 (BNZ-PT) as ceramic filler polyvinylidene fluoride (PVDF) polymer matrix. Unlike the conventional morphotropic phase boundary piezoelectrics such (1-x)PbTiO3-(x)PbZrO3, large piezoelectric response BNZ-PT obtained by...
Domain switching and lattice strain are known to be important processes contributing the large electromechanical response observed in perovskite-based piezoelectrics. However, there is a lack of clarity regarding coupling between two phenomena, factors which influence this coupling. Here, we report systematic investigation understand influencing domain perovskite piezoelectrics by x-ray diffraction situ with electric field. In slight departure from conventional approach, employ strategy...
A one-dimensional arbitrary system with quantum Hamiltonian H(q, p) is shown to acquire the 'geometric' phase gamma (C)=(1/2) contour integral c(Podqo-qodpo) under adiabatic transport q q+q+qo(t) and p p+po(t) along a closed circuit C in parameter space (qo(t), po(t)). The non-vanishing nature of this phase, despite only one degree freedom (q), due ultimately underlying non-Abelian Weyl group. physical realisation which Berry results line spread briefly discussed.
Morphotropic phase boundary (MPB) composition 0.94Na0.5Bi0.5TiO3–0.06BaTiO3 (NBT–6BT) has received industrial acceptance in certain aspects such as ultrasonic cleaners to replace those of lead-based systems. While detailed structure–property analysis on NBT–6BT is mostly confined room temperature and above, less attention paid with regard their structure property understanding below temperature. In this work, utilizing the complementarity Raman spectroscopy, x-ray diffraction, neutron powder...
[Formula: see text][Formula: text]TiO 3 -based lead-free piezoelectrics are considered for potential replacement of the lead-based commercial piezoceramics in high-power transducer applications. We have examined role grain size influencing structural-polar inhomogeneity stoichiometric and off-stoichiometric (NBT), its morphotropic-phase-boundary (MPB) derivative 0.94[Formula: -0.06BaTiO (NBT-6BT). Our study reveals that effect comes into play these systems on a very large length scale (on...
Polymer-piezoceramic composites harness the flexibility of polymer and piezoelectric properties ceramics to offer flexible materials for use in energy harvesting applications. Although, there is a general temptation piezoceramics which exhibits high coefficient (d33) fabrication such composites, are limitations posed by processing conditions composite eventually determines their overall performance. In present work we have explored this aspect detail. We fabricated with polyvinylidene...
Blackboards are the most common and effective tools in academic industrial sectors. The traditional way of cleaning blackboard is using a duster, which requires manual effort. Large sized blackboards consume much time energy them also generate certain amount dust may affect health person it. In order to overcome this, new system has been developed it possible clean automatically without any this work, an attempt made conceptualize design fabrication automated cleaner. This hybrid operated by...
Based on a conjecture for the four-step recursion relation occurring in series solution of Coulomb-diamagnetic problem two space dimensions, energy eigenvalue spectrum that reproduces known limits full is obtained exactly. The resulting nonperturbative deceptively simple combination purely Landau and Coulombic spectra but gives quasi-Landau levels with (3/2)\ensuremath{\Elzxh}${\ensuremath{\omega}}_{c}$ spacing near ionization threshold. made plausible terms an adiabatic continuation...
Local structural correlations in a novel ferroelectric solid solution [$x\mathrm{Bi}({\mathrm{Ni}}_{0.5}{\mathrm{Hf}}_{0.5}){\mathrm{O}}_{3}\text{\ensuremath{-}}(1\ensuremath{-}x){\mathrm{PbTiO}}_{3}$ at $x=0.39$] have been drawn out through atomistic modeling against neutron pair distribution functions and complementary Raman scattering measurements. By examining polar displacements of different cations from the refined models, we reveal distributions cation-specific dipolar fluctuations...