Search results for "ferroelectric phase transition"

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Crystal structure transformations induced by surface stresses in BaTiO3and BaTiO3@SiO2nanoparticles and ceramics

2015

International audience; Lattice structure transformations in nanopowders of ferroelectric BaTiO3 and BaTiO3@SiO2 core-shell nanostructured ceramics were studied by nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) at the temperatures 120–450 K and particle size of 300 and 500 nm. NMR spectra of all studied samples in the paraelectric phase are identical to the spectra in bulk material indicating their perfect perovskite structure without visible influence of particle surface. However, we have found that surface of particles essentially influence the ferroelectric phase transitions detected by both NMR and EPR techniques. The strongest changes as compared to bulk mat…

Phase transitionMaterials scienceAnalytical chemistry02 engineering and technologyCrystal structureceramics01 natural scienceslaw.inventionCondensed Matter::Materials Sciencechemistry.chemical_compoundNuclear magnetic resonancelawPhase (matter)barium titanate0103 physical sciencesGeneral Materials Science010306 general physicsElectron paramagnetic resonanceInstrumentation[CHIM.MATE]Chemical Sciences/Material chemistry021001 nanoscience & nanotechnologyFerroelectricityNMR spectra databasenuclear magnetic resonanceferroelectric phase transitionchemistryBarium titanateCurie temperaturenanoparticlesCondensed Matter::Strongly Correlated Electrons0210 nano-technologyPhase Transitions

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