Anelastic and Dielectric Characterization of Pb(Fe_0.50Nb_0.50)O₃ Multiferroic

Abstract

Magnetoelectric coupling in multiferroics materials remains as an interesting subject from fundamental as well as technological point of view, and in many cases is mediated via lattice strain. Therefore, anelastic measurements can be a powerful procedure to better understand this phenomenon. In this work, as fired Pb(Fe _0.50 Nb _0.50 )O ₃ ceramics were investigated through dielectric and ultrasonic techniques in temperature range from 15 K to 450 K. The anelastic experimental results present anomalies (additional to those related to the ferroelectric (T _C ) and antiferromagnetic (T _N ) ordering), which could be associated with not reported ferroelectric-ferroelectric (T∼ 315 K) and an antiferromagnetic-ferromagnetic phase transitions (110 K), respectively.

Keywords:

• Multiferroics
• ferroelectrics
• ferromagnetics
• lead iron niobate anelastic properties

Acknowledgments

The Brazilian agencies CAPES, FAPESP and CNPq for the financial support.