Search results for "Zirconate"

showing 10 items of 26 documents

Ab initio modelling of the effects of varying Zr (Ti) concentrations on the atomic and electronic properties of stoichiometric PZT solid solutions

2017

Abstract Lead zirconate titanate Pb(ZrxTi1−x)O3 solid solution is considered as one of the most advanced ferroelectric and piezoelectric materials. Consequent variation of Zr (Ti) concentrations significantly affects the atomic and electronic properties of PZT structures. To perform ab initio modelling of different morphologies for lead zirconate titanate, we are using approach of hybrid density functional B3PW as implemented in CRYSTAL14 computer code. In this study, we are performing large-scale calculations of such PZT parameters as optimized lattice constants, atomic charges and bond populations, as well as band structure (e.g., band gap) and density of states.

ChemistryBand gapAb initioAnalytical chemistry02 engineering and technology021001 nanoscience & nanotechnologyCondensed Matter PhysicsLead zirconate titanate01 natural sciencesBiochemistryFerroelectricityComputer Science::OtherCondensed Matter::Materials Sciencechemistry.chemical_compoundLattice constantComputational chemistry0103 physical sciencesDensity of statesPhysical and Theoretical Chemistry010306 general physics0210 nano-technologyElectronic band structureSolid solutionComputational and Theoretical Chemistry
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Phase transitions of Pb0.99Nb0.02(Zr0.75Sn0.20Ti0.05)O3ceramics

2001

Abstract The dielectric, elastic and electromechanical properties, electrocaloric effect and thermal expansion of poled and depoled Pb0.99Nb0.02(Zr0.75Sn0.20Ti0.05)O3 samples are presented to evaluate the nature of polar phases existing in the solid solution above room temperature. The Kittel's free energy expansion is used to explain some essential features of physical properties.

Condensed Matter::Materials SciencePhase transitionMaterials scienceCondensed matter physicsPolingDopingElectrocaloric effectDielectricCondensed Matter PhysicsZirconateThermal expansionElectronic Optical and Magnetic MaterialsSolid solutionFerroelectrics
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Laser heterodyne displacement measuring using PLZT frequency shifter

1991

Abstract The implementation of a frequency shifter based on lead lanthanum zirconate titanate ceramic (PLZT) and a voltage-controlled λ/4 plate is described. The capabilities of these elements are demonstrated with results from a Michelson-type laser heterodyne displacement measuring interferometer with 0.01 μm accuracy and 1 Hz display update rate.

HeterodyneMaterials sciencebusiness.industryMetals and AlloysLanthanum zirconateCondensed Matter PhysicsLaserTitanateDisplacement (vector)Surfaces Coatings and FilmsElectronic Optical and Magnetic Materialslaw.inventionInterferometryOpticslawvisual_artvisual_art.visual_art_mediumFrequency shifterCeramicElectrical and Electronic EngineeringbusinessInstrumentationSensors and Actuators A: Physical
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Structural and conductivity study of the proton conductor BaCe(0.9−x)ZrxY0.1O(3−ı) at intermediate temperatures.

2009

International audience; The perovskite BaCe(0.9−x)ZrxY0.1O(3−ı) is prepared by solid-state reaction at 1400 ◦C and sintering at 1700 ◦C. It is characterised using X-ray diffraction, Raman spectroscopy and electrical measurements. A distortion fromthe cubic structure at roomtemperature is noticeable in the Raman spectra for 0.2 < x < 0.8, but not in the X-ray diffraction patterns. This work points out the rhombohedral nature of this distortion. Phase transitions are studied up to 600 ◦C. The direct current conductivity is measured as a function of oxygen partial pressure, and at a water vapour partial pressure of 0.015 atm. The total conductivity is resolved into an ionic and a p-type compon…

High temperature proton conductorAnalytical chemistryEnergy Engineering and Power TechnologyMineralogy02 engineering and technologyConductivity010402 general chemistry01 natural sciencessymbols.namesakeIonic conductivityProton transportIonic conductivityElectrical measurementsBarium zirconateElectrical and Electronic EngineeringPhysical and Theoretical ChemistryProton conductorPerovskite (structure)Renewable Energy Sustainability and the EnvironmentChemistryBarium ceratePartial pressure021001 nanoscience & nanotechnology0104 chemical sciencesElectronic conductivityPhase transitionssymbols0210 nano-technologyRaman spectroscopy
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Rainfall energy harvester

2015

This chapter provides a detailed study on the harvest of the energy contained in raindrops by means of piezoelectric transducers. The energy harvester has the role of an electric source, able to recharge storage devices of small electronic components, such wireless sensors, by using the vibrational energy released by the drops hitting the transducer, reducing in such a way the chemical waste of conventional batteries. In technical literature, diverse studies agree on the level of suitable generated voltage on the electrodes of a piezoelectric transducer subjected to rainfall, but a complete characterization on the supplied power is still missing. This work, also to limit optimistic forecast…

HydrologySettore ING-IND/31 - ElettrotecnicaEnvironmental scienceEnergy harvester piezoelectric effect lead zirconate titanate PZT polyvinylidene difluoride PVDF cantilever structureSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciEnergy harvester
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CO2 laser-induced structure changes in lead zirconate titanate Pb(Zr0.58Ti0.42)O3 sol–gel films

2003

Based on absorption spectra of lanthanum modified lead zirconate titanate Pb0.9La0.1(Zr0.65Ti0.35)O3 (PLZT10/65/35) ferroelectric ceramics an idea of local and selective treatment of lead zirconite titanate Pb(ZrXTi1−X)O3 (PZT) sol–gel film in the multi-layer structure by CO2 laser radiation was formulated. The possibility to obtain PZT perovskite film on the SiO2/Si substrate by irradiation with CO2 laser was shown experimentally. X-ray studies revealed the PZT perovskite structure ratio growth at the expenses of pirochlore structure with an increased power density of laser radiation.

Materials scienceAbsorption spectroscopyFerroelectric ceramicsGeneral Physics and Astronomychemistry.chemical_elementMineralogySurfaces and InterfacesGeneral ChemistryCondensed Matter PhysicsLead zirconate titanateLaserTitanateSurfaces Coatings and Filmslaw.inventionchemistry.chemical_compoundchemistrylawLanthanumComposite materialSol-gelPerovskite (structure)Applied Surface Science
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Using the methods of radiospectroscopy (EPR, NMR) to study the nature of the defect structure of solid solutions based on lead zirconate titanate (PZ…

2014

The nature of intrinsic and impurity point defects in lead zirconate titanate (PZT) ceramics has been explored. Using electron paramagnetic resonance (EPR), nuclear magnetic resonance (NMR), and X-ray photoelectron spectroscopy (XPS) methods, several impurity sites have been identified in the materials, including the Fe 3+ -oxygen vacancy (VO) complex and Pb ions. Both of these centers are incorporated into the PZT lattice. The Fe 3+ -V paramagnetic complex serves as a sensitive probe of the local crystal field in the ceramic; the symmetry of this defect roughly correlates with PZT phase diagram as the composition is varied from PbTiO 3 to PbZrO 3 . NMR spectra 207 Pb in PbTiO 3 , PbZrO 3 ,…

Materials scienceAcoustics and UltrasonicsAnalytical chemistryCrystal structureLead zirconate titanateCrystallographic defectlaw.inventionNMR spectra databaseParamagnetismchemistry.chemical_compoundNuclear magnetic resonancechemistryImpuritylawElectrical and Electronic EngineeringElectron paramagnetic resonanceInstrumentationSolid solutionIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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Harvesting rainfall energy by means of piezoelectric transducer

2013

In this paper a detailed study on the piezoelectric energy harvesting of rainfall is presented. Different features have been taken into account in order to define the limits in this energy harvesting. Only commercial transducers have been considered: a lead zirconate titanate and polyvinylidene difluoride transducer.

Materials scienceAcousticsPolyvinylidene difluorideenergy harvesting piezoelectricSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciLead zirconate titanatePiezoelectricitySettore ING-INF/01 - Elettronicachemistry.chemical_compoundSettore ING-IND/31 - ElettrotecnicaTransducerchemistryPMUTEnergy harvestingEnergy (signal processing)
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The nature of the defect structure of solid solutions based on lead zirconate titanate (PZT): Evidence from EPR and NMR

2013

The nature of intrinsic and impurity point defects in lead zirconate titanate (PZT) ceramics has been explored. Using electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR) methods several impurity sites have been identified in the materials, including Fe3+-oxygen vacancy (VO) complex and Pb ions. Both of these centers are incorporated into the PZT lattice. The Fe3+-VO paramagnetic complex serves as a sensitive probe of the local crystalline field in the ceramic; the symmetry of this defect is roughly correlated with PZT phase diagram as composition is varied from PbTiO3 to PbZrO3. NMR spectra 207Pb in PbTiO3, PbZrO3 and PZT with iron content from 0 to 0.4 mol % showed t…

Materials scienceAnalytical chemistryCrystal structureLead zirconate titanateCrystallographic defectlaw.inventionParamagnetismchemistry.chemical_compoundNuclear magnetic resonancechemistryImpuritylawVacancy defectElectron paramagnetic resonanceSolid solution2013 Joint IEEE International Symposium on Applications of Ferroelectric and Workshop on Piezoresponse Force Microscopy (ISAF/PFM)
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Antiferroelectric PbZrO3 thin films: structure, properties and irradiation effects

2004

Abstract Irradiation effects on highly oriented antiferroelectric PbZrO 3 and ferroelectric Pb 0.92 La 0.08 (Zr 0.65 Ti 0.35 )O 3 thin films are investigated being exposed to neutron irradiation up to fluence 2*10 22 m −2 . The higher resistance of antiferroelectric PbZrO 3 thin films as compared to ferroelectric heterostructures to large fluences of neutron irradiation is recognized and discussed. Influence of two factors (structural and charge) was taken into account analysing irradiation effects on materials of different polarization states: ferroelectric PLZT (ceramics and thin films) and antiferroelectric PbZrO 3 films.

Materials scienceCondensed matter physicsMaterials ChemistryCeramics and CompositesMineralogyAntiferroelectricityIrradiationDielectricThin filmFluenceFerroelectricityTitanateZirconateJournal of the European Ceramic Society
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