Search results for "lead-free"

showing 4 items of 4 documents

Ab initio simulation of (Ba,Sr)TiO3 and (Ba,Ca)TiO3 perovskite solid solutions

2019

This research was supported by the ERA-NET HarvEnPiez project. Many thanks to R. Dovesi, M.M. Kržmanc and D. Gryaznov for fruitful discussions.

First-principles computationAb initio:NATURAL SCIENCES:Physics [Research Subject Categories]Density functional theory (DFT)Perovskite solid solutionLead-free piezoelectric
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Grain growth in Na 0.5 Bi 0.5 TiO 3 -based solid solutions

2019

This paper discusses effects of different dopants, sintering technique and parameters on microstructure and properties of pure and Yb, Er-doped Na0.5Bi0.5TiO3 (NBT). All stoichiometric compositions follow the abnormal grain growth mechanism (AGG) and exhibit a bimodal grain size distribution. Bi over-stoichiometry, two step sintering and hot pressing are effective inhibitors of AGG. Microstructure of sintered NBT greatly influences such properties as dielectric permittivity and depolarization temperature.

Materials sciencesolid-state sinteringSintering02 engineering and technologyAbnormal grain growth01 natural sciencesNBT0103 physical sciencesMaterials Chemistry:NATURAL SCIENCES:Physics [Research Subject Categories]Electrical and Electronic Engineering010302 applied physicsDopantabnormal grain growthLead-free ferroelectrics021001 nanoscience & nanotechnologyCondensed Matter PhysicsMicrostructureElectronic Optical and Magnetic MaterialsGrain growthChemical engineeringControl and Systems EngineeringCeramics and Composites0210 nano-technologyStoichiometrySolid solutionIntegrated Ferroelectrics
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The Effect of Dopants on Sintering and Microstructure of Lead-free KNN Ceramics

2011

Lead-free potassium sodium niobate (K0.5Na0.5)NbO3 (KNN) has been prepared via conventional ceramic processing method. The influence of 0.5 wt% - 1.5 wt% MnO2 and WO3 addition on the sintering, crystallographic structure, microstructure and dielectric properties of KNN has been investigated. Optimal sintering temperatures of KNN ceramics were observed to be in the narrow interval: 1090 °C - 1110 °C for MnO2 doped KNN; 1150 °C - 1170 °C for pure KNN and doped with WO3. XRD patterns showed that all the samples have single perovskite structure with monoclinic structure. Microstructure of ceramics was changed greatly by using dopants.http://dx.doi.org/10.5755/j01.ms.17.1.251

lead-freelcsh:TN1-997sinteringMaterials scienceDopantDopingAnalytical chemistrySinteringMineralogyDielectricCrystal structureMicrostructurepotassium sodium niobatevisual_artpiezoelectric ceramicsvisual_art.visual_art_mediumoxide additivesGeneral Materials ScienceCeramiclcsh:Mining engineering. MetallurgyMonoclinic crystal systemMedžiagotyra
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State of the art and prospects for halide perovskite nanocrystals

2021

Financiado para publicación en acceso aberto: Universidade de Vigo/CISUG Metal-halide perovskites have rapidly emerged as one of the most promising materials of the 21st century, with many exciting properties and great potential for a broad range of applications, from photovoltaics to optoelectronics and photocatalysis. The ease with which metal-halide perovskites can be synthesized in the form of brightly luminescent colloidal nanocrystals, as well as their tunable and intriguing optical and electronic properties, has attracted researchers from different disciplines of science and technology. In the last few years, there has been a significant progress in the shape-controlled synthesis of …

light-emitting devicesGeneral Physics and AstronomyNanotechnology02 engineering and technology010402 general chemistry01 natural sciences7. Clean energyphotocatalystsmetal-halide perovskite nanocrystalslead-free perovskite nanocrystalsPhotovoltaicsGeneral Materials ScienceNanoscience & NanotechnologyPerovskite (structure)Electronic propertiesPhysicsbusiness.industryPhysicsperovskite nanoplateletsGeneral Engineering021001 nanoscience & nanotechnology0104 chemical sciencesddc:Chemistryphotovoltaicsperovskite nanocubesmetal-halide perovskite nanocrystals; perovskite nanoplatelets; perovskite nanocubes; perovskite nanowires; lead-free perovskite nanocrystals; light-emitting devices; photovoltaics; lasers; photocatalysts; photodetectorsNanocrystalperovskite nanowiresphotodetectors2307 Química Física0210 nano-technologybusinessEngineering sciences. Technologylasers
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