6533b82dfe1ef96bd12912d5
RESEARCH PRODUCT
Dipolar Glass-Like Perovskite Sr0.8Bi0.2TiO3Ceramic
Andris SternbergJuras BanysKarlis BormanisRobertas GrigalaitisSarunas Bagdzeviciussubject
PermittivityMaterials scienceCondensed matter physicsRelaxation (NMR)Activation energyCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsDipoleDistribution functionNuclear magnetic resonancevisual_artvisual_art.visual_art_mediumCeramicCole–Cole equationPerovskite (structure)description
In this work lead-free Sr0.8Bi0.2TiO3 ceramic have been investigated in the frequency range from 20 Hz to 36 GHz. The obtained results show pronounced dispersion below room temperature. It looks more similar to the one observed in dipolar glasses as in relaxors. Calculated relaxation time distribution function broadens towards longest relaxation times with decreasing temperature. The obtained most probable relaxation time fulfills Vogel-Fulcher relationship with the following parameters: dipole activation energy EA/kB = 1718 K, freezing temperature T0 = 65 K, attempt relaxation time, referring to dipole relaxation at very high temperatures, τ0 = 5.5·10−14 s.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-09-21 | Ferroelectrics |