Phase transitions and magnetoelectroelastic instabilities in Pb(Fe1/2Nb1/2)O3 multiferroic ceramics
| Autor: | M. H. Lente, N. Frizon, Adelino A. Coelho, B. Fraygola, José Antonio Eiras, D. Garcia |
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| Rok vydání: | 2013 |
| Předmět: |
Phase transition
Materials science Polymers and Plastics Condensed matter physics Metals and Alloys Dielectric Ferroelectricity Electronic Optical and Magnetic Materials Ferromagnetism visual_art Ceramics and Composites visual_art.visual_art_medium Antiferromagnetism Multiferroics Ceramic Néel temperature |
| Zdroj: | Acta Materialia. 61:1518-1524 |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2012.11.029 |
| Popis: | Magnetoelectric coupling can be observed in multiferroic materials in the regions where magnetic and ferroelectric ordering coexist and in many cases is mediated via lattice strain. Pb(Fe 1/2 Nb 1/2 )O 3 (PFN) is a well-known multiferroic, presenting ferroelectric ordering (below T C = 380 K) and a Neel temperature (antiferromagnetic ordering) T N = 143 K. However, recent experimental results suggest that PFN can display ferromagnetic ordering at higher temperatures and a still unclear sequence of phase transitions. In this work, high-density PFN ceramics were prepared by a conventional ceramic method. Dielectric, magnetic and anelastic responses were measured as a function of temperature. The experimental results present complementary evidence of anomalies (additional to those which can be directly associated with the reported transitions at T C and T N ) which cold be associated with a structural phase transition ( T ∼ 315 K), an antiferromagnetic–ferromagnetic phase transition (110 K) and magnetoelectroelastic instabilities around 250 K. |
| Databáze: | OpenAIRE |
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