Polaron conductivity mechanism in 0.5Pb(Zr0.575Ti0.425)O3–0.5Pb(Fe2/3W1/3)O3
2010; Elsevier BV; Volume: 405; Issue: 20 Linguagem: Inglês
10.1016/j.physb.2010.07.023
ISSN1873-2135
AutoresA. Levstik, C. Filipič, V. Bobnar, Silvo Drnovšek, Janez Holc, Marija Kosec,
Tópico(s)Solid-state spectroscopy and crystallography
Resumo0.5Pb(Zr0.575Ti0.425)O3–0.5Pb(Fe2/3W1/3)O3 (0.5PZT–0.5PFW) belongs to the solid solutions which exhibits some bi-relaxor properties, with both ferroelectric and magnetic relaxor properties. Recently it was reported that the thin film of 0.8Pb(Zr0.53Ti0.47)O3–0.2Pb(Fe2/3W1/3)O3 (0.8PZT–0.2PFW) has a new and very large magnetoelectric effect—switching from Pr to zero with applied magnetic field of less than a Tesla. We report dielectric and ac electric conductivity investigations of the 0.5PZT–0.5PFW bulk ceramics. A detailed analysis of the temperature dependence of the universal dielectric response parameter s in terms of the theoretical model for tunneling of small polarons revealed that below 450 K this mechanism governs the charge transport in the system. This provides a new understanding of the magnetoelectric effect in 0.5PZT–0.5PFW.
Referência(s)