Room-temperature magnetoelectric coupling in single-phase BaTiO 3-BiFeO3 system

Su Chul Yang, Ashok Kumar, Valeri Petkov, Shashank Priya

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Abstract

In this paper, single-phase multiferroic ceramics of (1 - x) BaTiO 3 - x BiFeO3 (BT - x BFO) were synthesized by solid-solution method in the wide range of material composition (x = 0.025 - 1.0). The changes in crystal structure were confirmed via X-ray diffractions (XRD) and atomic pair distribution functions (PDFs). The room-temperature ME coupling was found to exhibit significant magnitude in the narrow composition window (x = 0.71 - 0.8) where the average crystal structure was found to be rhombohedral. Especially, the BT - 0.725 BFO ceramics containing local monoclinic distortions within rhombohedral phase were found to exhibit high room-temperature ME coefficient (αME) of 0.87 mV/cm·Oe with high piezoelectric properties (g33 = 18.5 × 10 mV m N -1 and d33 = 124 pC N-1). We believe that the high room-temperature ME coupling in single-phase lead-free BT-BFO ceramics provides a possibility of developing electrically or magnetically tunable thin-film devices.

Original languageEnglish (US)
Article number144101
JournalJournal of Applied Physics
Volume113
Issue number14
DOIs
StatePublished - Apr 14 2013
Externally publishedYes

Bibliographical note

Funding Information:
The authors gratefully acknowledge the financial support from ARMDEC (S.-C. Yang) and Office of Naval Research (A. K. and S.P.) through the CEHMS seed program. We appreciate help from Dr. Dwight Viehland (Department of Materials Science and Engineering, Virginia Tech) for VSM measurement.

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