Electric field dependences of Curie and Néel phase transition temperatures in magnetoelectric relaxor multiferroic Pb(Fe0.5 Ta0.5 )O3 crystals seen via acoustic emission
| Autor: | Evgeniy Dul'kin, Antoni Kania, I. Gruszka, Michael Roth |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Phase transition
Materials science Condensed matter physics Field (physics) 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Ferroelectricity Electronic Optical and Magnetic Materials Acoustic emission Electric field 0103 physical sciences Curie Polar Multiferroics 010306 general physics 0210 nano-technology |
| Zdroj: | physica status solidi (b). 253:738-743 |
| ISSN: | 0370-1972 |
| DOI: | 10.1002/pssb.201552668 |
| Popis: | Pb(Fe0.5Ta0.5)O3 magnetic and ferroelectric relaxor multiferroic crystals have been studied under both temperature and dc external electric field conditions by means of acoustic emission technique. All the characteristic relaxor points as Burns Td ≈ 610 K and intermediate T* ≈ 500 K temperatures, as well as both Curie ferroelectric cubic-tetragonal Tc1 ≈ 259 K and tetragonal–monoclinic Tc2 ≈ 201 K structural and Neel antiferromagnetic–paramagnetic TN ≈ 187 K phase transitions have been successfully detected. It is shown that, when an external dc electric field is applied, both Tc1 and Tc2 exhibit a nonlinear or V-shape behavior and attain the sharp minima at threshold temperatures Tth1 ≈ 247 K and Tth2 ≈ 200 K with the threshold field Eth ≈ 0.1 kV cm−1, as the field enhances, while their acoustic emission count rate monotonically increases. It is shown, too, that the TN behaves linearly in dependence on dc electric field with a negative slope of about −20 K cm kV−1, while its acoustic emission count rate monotonically decreases. All these data are discussed from a viewpoint of presence of polar nanoregions and magnetoelectric coupling effect in Pb(Fe0.5Ta0.5)O3 crystals. |
| Databáze: | OpenAIRE |
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