Polaron conductivity mechanism in 0.5Pb(Zr0.575Ti0.425)O3–0.5Pb(Fe2/3W1/3)O3

✍ Scribed by A. Levstik; C. Filipič; V. Bobnar; S. Drnovšek; J. Holc; M. Kosec

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 321 KB
• Volume: 405
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2010.07.023

✦ Synopsis

a b s t r a c t 0.5Pb(Zr 0.575 Ti 0.425 )O 3 -0.5Pb(Fe 2/3 W 1/3 )O 3 (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(Zr 0.53 Ti 0.47 )O 3 -0.2Pb(Fe 2/3 W 1/3 )O 3 (0.8PZT-0.2PFW) has a new and very large magnetoelectric effect-switching from P r 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.