X-Ray Diffraction, Mössbauer Spectroscopy, and Magnetoelectric Effect Studies of Multiferroic Bi₅Ti₃FeO₁₅Ceramics

Abstract

Bi5Ti3FeO15 ceramics belongs to multiferroic class of materials. In this work it was prepared by solidstate sintering method and investigated by X-ray diraction, Mössbauer spectroscopy, and magnetoelectric effect measurements. As it was proved by X-ray diraction studies the single-phase Bi5Ti3FeO15 compound was obtained. The Mössbauer investigations revealed paramagnetic character of the compound at room temperature as well as at 80 K. Magnetoelectric measurements were carried out at room temperature using lock-in dynamic method and they proved presence of magnetoelectric coupling in this material. Additional magnetoelectric studies were carried out after subsequent electric poling of the sample. It was found that the maximum value of the coupling coecient was almost twice bigger than in the case without the initial poling and reached a value of αME ≈ 20.7 mV cm.

Magnetoelectric Effect in Ceramics Based on Bismuth Ferrite

“…As proved by XRD, Mössbauer spectroscopy, and magnetic measurements, the Bi 5 Ti 3 FeO 15 Aurivillius compound is a single-phase paramagnetic material within the broad temperature range 2–350 K (our earlier articles [38, 39, 45]). Despite being paramagnetic at room temperature, i.e., in the absence of magnetic long-range order, the sample shows magnetoelectric coupling (Fig.…”

“…The results of X-ray diffraction studies for Bi 1 −  x Nd x FeO 3 solid solutions and the Aurivillius Bi 5 Ti 3 FeO 15 compound have been published in our previous works [37–39]. It was found that with an increase of Nd content in Bi 1 −  x Nd x FeO 3 solid solutions, within the range of x  = 0.2–0.3, a structural phase transition from rhombohedral to orthorhombic system occurs.…”

“…In the case of the Bi 5 Ti 3 FeO 15 compound, a pure Aurivillius phase with orthorhombic lattice ( Fmm2 no. 42 space group) was obtained [38, 39]. …”

“…The preliminary synthesis of the compound was carried out in air at 1023 K for 10 h while the sintering was performed in air at a temperature of 1253 K for 3 h. The detailed information about the preparation process has been published in our earlier works [38, 39]. …”

Structure and Magnetic Properties of Bi5Ti3FeO15 Ceramics Prepared by Sintering, Mechanical Activation and Edamm Process. A Comparative Study

“…At room temperature, the ceramics Bi 5 Ti 3 FeO 15 combines ferroelectric, semiconducting, and antiferromagnetic properties [1][2][3], which make it very attractive material for applications as sensors, actuators, and digital memory elements [4][5][6]. Moreover, the Aurivillius Bi 5 Ti 3 FeO 15 compound offers multiferroic properties, having relatively high magneto-electric coupling coefficient α ME ~ 20 mVcm -1 Oe -1 [7] and being one of the few single-phase multiferroics which are in competition for composite materials, e.g. ferroelectric-ferromagnetic composite PZT-ferrite [8].…”