Abstract:In this review, the state of the art in understanding the structural phase relations in perovskite-structured BiFeO 3 -based polycrystalline solid solutions is presented and discussed. Issues about the close relation between the structural phase and overall physical properties of the reviewed systems are pointed out and discussed. It is shown that, by adjusting the structural symmetric arrangement, the ferroelectric and magnetic properties of BiFeO 3 -based polycrystalline solid solutions can be tuned to find specific multifunctional applications. However, an intrinsic mechanism linking structural arrangement and physical properties cannot be identified, revealing that this subject still deserves further discussion and investigation.
Multiferroics are an important family of materials with special properties suitable for applications in advanced technological devices. In most of the cases, the ferroelectric ordering and domain wall formation determine and control their operation and functionality. However, the physical mechanisms by which these domain walls are formed are still not yet completely clarified. Also, in the last few years, few advances are found in the mechanisms used to explain the domain walls and their influence on the materials properties. In this work, the domain walls in ferroelectric multiferroics were investigated by using high-resolution transmission electron microscopy and image simulations. The ferroelectric switching was also observed by piezoresponse force microscopy. A three-dimensional atomic-level framework of 90 ferroelectric domain walls was proposed and the structural and ferroelectric features at the domain walls, such as length, width, and angle between domains, were determined. From these studies, it was found that ferroelectric and structural features of multiferroic BiFeO 3 -PbTiO 3 compounds, such as domain-orientation, electrical conductivity, magnetic ordering, and brittleness due to strains at the domain walls, can be controlled by particular atomic substitutions at the A site of the perovskite structure.
In this paper, the microscopic mechanism for structural, ferroelectric, and magnetic stabilities in displacive perovskite structured multiferroics is investigated by studying BiFeO3-PbTiO3 solid solutions. The results revealed that thermal stability and ferroic orders are intimately connected with the changes in A and B perovskite sites. The breakdown mechanism of the cycloidal magnetic network, which permits to observe the resulting macroscopic magnetization is reveled, compared, and presented for various compositions of the BiFeO3-PbTiO3 system. The delicate energetic balance that stabilizes the electrically polar structures in displacive perovskite multiferroics is proposed and it was showed that it is fully connected to the configuration (atomic occupancy and formal ionic charge) of each individual site of the perovskite unit cell.
Articles you may be interested inFerromagnetic, ferroelectric properties, and magneto-dielectric effect of Bi4.25La0.75Fe0.5Co0.5Ti3O15 ceramics Appl.In this manuscript, X-ray and high-resolution neutron powder diffraction investigations, associated with Rietveld refinements, magnetic hysteresis curves and a modeling of electron-density distributions around the ions, are used to describe the driving forces responsible for tuning the ferroic states in La doped (0.6)BiFeO 3 -(0.4)PbTiO 3 compositions. The intrinsic relations between the ferroic orders and the structural arrangements (angles, distances and electron-density distributions around the ions) are revealed, helping in the understanding of some aspects comprising the ferroic properties of perovskite-based displacive multiferroic compounds. V C 2014 AIP Publishing LLC. FIG. 3. Magnetic and structural features of BFPT-yL compositions. (a)Complete representation of structural symmetries: hexagonal (black line), rhombohedral (yellow (online) or light gray lines), and magnetic pseudocubic (red (online) or dark gray dot lines). Insets: Superexchange angles for (i) y ¼ 3, (ii) y ¼ 10, and (iii) y ¼ 30 samples. (b) Magnetization, distance between Fe 3þ ions (d S-Ex ) and superexchange angles (h S-Ex ) as a function of La concentration. 034107-5C otica et al.
In this work, high dense, single phase ceramics of the 0.3BiFeO3 0.7BaTiO3 multiferroic solid solution were prepared by spark plasma sintering. The structural, microstructural, multiferroic and piezoelectric properties were investigated. The samples presented good magnetic and ferroelectric properties, Pr = 8.3 μC/cm2 and Mr = 0.03 emu/g, with low dielectric AC losses below the ferroelectric transition temperature. The obtained piezoelectric coefficients were determined as d31 = -8.1 pm/V and d33 = 13.5 pm/V.
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