0000000000773231

AUTHOR

B. Handke

showing 2 related works from this author

Raman spectra and anomalies of dielectric properties and thermal expansion of lead-free (1−x)Na0.5Bi0.5TiO3-xSrTiO3 (x = 0, 0.08 and 0.1) ceramics

2016

ABSTRACTThermal expansion, Raman and dielectric properties of the lead-free (1−x)Na0.5Bi0.5TiO3-xSrTiO3 (x = 0, 0.08 and 0.1) ceramic solid solutions, fabricated by the conventional solid-state reaction method, were investigated. The Sr-doping results in an increase of the dielectric permittivity, broadening of the permittivity maximum, enhancement of the relaxation near depolarization temperature, broadening of the Raman bands and shift of all anomalies toward lower temperatures. The observed effects are attributed to an increase of the degree of cationic disorder and enhancement of the relaxor-like features. Anomalies in the thermal expansion strain were observed at the temperatures corre…

010302 applied physicsPermittivityPhase transitionMaterials scienceCondensed matter physicsRelaxation (NMR)02 engineering and technologyDielectric021001 nanoscience & nanotechnology01 natural sciencesThermal expansionTetragonal crystal systemsymbols.namesakePhase (matter)0103 physical sciencessymbolsGeneral Materials Science0210 nano-technologyRaman spectroscopyInstrumentationPhase Transitions
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Influence of Sr addition on structural, dielectric and Raman properties of Na0.5Bi0.5TiO3ceramics

2016

ABSTRACTLead free (Na0.5Bi0.5)1-xSrxTiO3 (x = 0, 0.01 and 0.02) ceramics were produced by a conventional solid-state sintering method. X-ray diffraction analysis shows that the obtained samples possess the perovskite structure with rhombohedral symmetry. The microstructure study shows a dense structure, in agreement with the relative density (above 97%). Dielectric analysis revealed the diffuse character of the electric permittivity anomalies and their shift to a lower temperature range after Sr doping of NBT. The Raman spectra are similar for all samples in agreement with the X-ray diffraction data. The possible origin of the observed effects was discussed.

010302 applied physicsPermittivityDiffractionMaterials scienceDopingAnalytical chemistrySintering02 engineering and technologyDielectric021001 nanoscience & nanotechnologyCondensed Matter PhysicsMicrostructure01 natural sciencesElectronic Optical and Magnetic Materialssymbols.namesakeControl and Systems Engineering0103 physical sciencesMaterials ChemistryCeramics and CompositessymbolsRelative densityElectrical and Electronic Engineering0210 nano-technologyRaman spectroscopyIntegrated Ferroelectrics
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