0000000000292105

AUTHOR

Yu. V. Kochergin

showing 4 related works from this author

The Nature of Dielectric Nonlinearity in the Region of Diffused Phase Transition in Layered Ferroelectric BaBi2Nb2O9

2008

By studying the dielectric properties of BaBi 2 Nb 2 O 9 ceramics, a representative of layered ferroelectrics, significant dispersion of ϵ* has been revealed at low- and infra-low frequences in the region of phase transition. Dispersion of ϵ* observed in “low-temperature” region (T T m where the basic contribution to ϵ* is provided by processes of the Maxwell-Wagner relaxation.

PermittivityPhase transitionMaterials scienceCondensed matter physicsDielectricCondensed Matter PhysicsFerroelectricityElectronic Optical and Magnetic MaterialsNonlinear systemvisual_artDispersion (optics)visual_art.visual_art_mediumRelaxation (physics)CeramicFerroelectrics
researchProduct

DIELECTRIC AGEING IN LAYERED FERROELECTRICS

2008

ABSTRACT Studies of the effects of sample history on long-term relaxation of polarization in the Na0.5Bi8.5Ti2Nb4O27 and Na0.5Bi8.5Ti2Ta4O27 ferroelectrics of layered structures are reported. The type of functional relationship of e′(t) at measuring procedures including heating or cooling to the temperature being examined Ta is found to change from exponential (Kohlrausch function) to logarithmic. Results are discussed within the assumption of presence of defect complexes in disordered ferroelectrics.

Phase transitionMaterials scienceCondensed matter physicsSAMPLE historyDielectricCondensed Matter PhysicsPolarization (waves)Electronic Optical and Magnetic MaterialsExponential functionDielectric spectroscopyControl and Systems Engineeringvisual_artMaterials ChemistryCeramics and Compositesvisual_art.visual_art_mediumCeramicElectrical and Electronic EngineeringIntegrated Ferroelectrics
researchProduct

Dielectric response of disordered BaBi2Nb2O9perovskite ceramics

2007

Studies of dielectric properties of BaBi2Nb2O9 ceramics are reported. Considerable dispersion of ?* at low- and infra-low frequencies has been revealed in the region of the diffused phase transition. Dispersion of ?* is divided into ''low-temperature'' dispersion related to relaxation of polar formations and their boundaries and ''high-temperature'' dispersion (at T ? Tm) the main contribution to which comes from Maxwell-Wagner relaxation.

PermittivityHistoryPhase transitionOxide mineralsMaterials scienceCondensed matter physicsDielectricComputer Science ApplicationsEducationvisual_artDispersion (optics)visual_art.visual_art_mediumRelaxation (physics)CeramicPerovskite (structure)Journal of Physics: Conference Series
researchProduct

Depolarization Currents and Ageing in Layered Na0.5Bi8.5Ti2Nb4O27and Na0.5Bi8.5Ti2Ta4O27Ferroelectrics

2009

The present study is focused on the behaviour of polarization and depolarization currents and processes of the slow relaxation of polarization within the range of temperatures where the anomalies are displayed by the materials. Results of the study are discussed with regard to possible existence of defect complexes in disordered ferroelectrics.

Phase transitionMaterials scienceOpticsCondensed matter physicsbusiness.industryDepolarizationCondensed Matter PhysicsbusinessPolarization (waves)Electronic Optical and Magnetic MaterialsTantalateDielectric spectroscopyFerroelectrics
researchProduct