Dipolar Glass-Like Perovskite Sr0.8Bi0.2TiO3Ceramic
| Autor: | Andris Sternberg, Juras Banys, Karlis Bormanis, Robertas Grigalaitis, Sarunas Bagdzevicius |
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| Rok vydání: | 2010 |
| Předmět: |
Permittivity
Materials science Condensed matter physics Relaxation (NMR) Activation energy Condensed Matter Physics Electronic Optical and Magnetic Materials Dipole Distribution function Nuclear magnetic resonance visual_art visual_art.visual_art_medium Ceramic Cole–Cole equation Perovskite (structure) |
| Zdroj: | Ferroelectrics. 400:434-440 |
| ISSN: | 1563-5112 0015-0193 |
| DOI: | 10.1080/00150193.2010.506082 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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