Compositional dependence of ferromagnetic and magnetoelectric effect properties in BaTiO3–BiFeO3–LaFeO3 solid solutions. Issue 82 (7th November 2017) - Qi, Xiwei
Abstract : The maximum value of the magnetoelectric coefficient reached 354 mV (cm −1 Oe −1 ) for the ceramic with x = 0.4. Abstract : Multiferroic ceramics consisting of barium titanate (BaTiO3, BT), bismuth ferrite (BiFeO3, BFO), and lanthanum ferrite (LaFeO3, LFO), namely (1 − x )(0.96BaTiO3 –0.04BiFeO3 )– x LaFeO3 (BT–BFO– x LFO, where x = 0.1–0.5), were synthesized by the sol–gel method. The crystal structure, microstructure, and dielectric, ferromagnetic, and magnetoelectric properties of the ceramics were systematically investigated. Structural analysis of BT–BFO– x LFO solid solution showed a pure perovskite structure. The Rietveld refined XRD data fitted well with an orthorhombic structure ( Pbnm space group). BT–BFO–0.4LFO and BT–BFO–0.5LFO exhibited initial dielectric constants of 2114 and 1741, respectively, at 20 Hz, followed by fast decay with increasing frequency. In comparison, the BT–BFO– x LFO ceramics with x = 0.1–0.3 showed excellent stability. Remarkably improved ferromagnetic properties were obtained for BT–BFO–0.4LFO, and the remnant magnetization increased from 0.008 to 0.666 emu g −1 when x was increased from 0.1 to 0.4. The maximum value of the magnetoelectric coefficient reached 354 mV (cm −1 ·Oe −1 ) for the ceramic with x = 0.4 at 1000 kHz and 1 kOe.