Magnetoelectric Effect in Ceramics Based on Bismuth Ferrite
© Jartych et al. 2016
Received: 12 February 2016
Accepted: 14 April 2016
Published: 30 April 2016
Solid-state sintering method was used to prepare ceramic materials based on bismuth ferrite, i.e., (BiFeO3)1 − x –(BaTiO3) x and Bi1 − x Nd x FeO3 solid solutions and the Aurivillius Bi5Ti3FeO15 compound. The structure of the materials was examined using X-ray diffraction, and the Rietveld method was applied to phase analysis and structure refinement. Magnetoelectric coupling was registered in all the materials using dynamic lock-in technique. The highest value of magnetoelectric coupling coefficient α ME was obtained for the Bi5Ti3FeO15 compound (α ME ~ 10 mVcm−1 Oe−1). In the case of (BiFeO3)1 − x –(BaTiO3) x and Bi1 − x Nd x FeO3 solid solutions, the maximum α ME is of the order of 1 and 2.7 mVcm−1 Oe−1, respectively. The magnitude of magnetoelectric coupling is accompanied with structural transformation in the studied solid solutions. The relatively high magnetoelectric effect in the Aurivillius Bi5Ti3FeO15 compound is surprising, especially since the material is paramagnetic at room temperature. When the materials were subjected to a preliminary electrical poling, the magnitude of the magnetoelectric coupling increased 2–3 times.
Multiferroics are the class of intelligent materials which exhibit at least two from the three possible ferro- orders, i.e., ferromagnetic (also ferrimagnetic, antiferromagnetic, or ferrotoroidal), ferroelectric, and ferroelastic [1, 2]. Especially interesting from the application point of view is the group of magnetoelectrics which offers long-range ordering of the elementary magnetic moments as well as long-range ordering of the electric dipoles [3, 4]. Moreover, they exhibit a coupling between the magnetic and the electric sub-systems what makes possible induction of magnetization by applying an external electric field or induction of electric polarization by applying an external magnetic field [5, 6]. Therefore, the so-called magnetoelectric (ME) effect attracts a lot of interest also from the basic research point of view. Experimentally, ME effect is measured and expressed by magnetoelectric coupling coefficient, α ME, typically specified in units of mVcm−1 Oe−1.
Although the magnetoelectric effect is known since the 1960s of the last century, an intensive growth of interest in the possibilities of practical application of this phenomenon occurred in the late 1990s. In 2003 and 2004, the first results confirming the possibility of switching electrical polarization by an external magnetic field in TbMnO3 and TbMn2O5 were published [7, 8]. Although this effect has been observed only at low temperatures, these works gave rise to many new research projects focusing on the α ME optimization. The higher value of this parameter can be achieved in magnetoelectric material at room temperature, and the wider range of its potential applications can be expected. The most frequently mentioned prototypes of magnetoelectric devices which were developed so far are magnetic field sensors [9–11] and energy harvesting devices [12–14]. Among the new proposals for the use of magnetoelectric coupling phenomenon, the most spectacular and forward-looking ideas seem to be new-generation memories [15–17], spintronic devices (e.g., spin valves, magnetic tunnel junctions) [18–20], microwave, millimeter-wave devices and miniature antennas , and wireless medical tools (e.g., for endoscopy and brain imaging) . The implementation of such innovative devices requires, however, the elaboration of materials having possibly high magnetoelectric coupling coefficient.
The magnetoelectric effect is especially high in composite materials. In particulate composites, like BaTiO3/CoFe2O4, PbZr1 − x Ti x O3(PZT)/Tb1 − x Dy x Fe2(Terfenol-D), and Ba0.8Pb0.2TiO3/CuFe1.8Cr0.2O4, the value of α ME is of the order of 100–130 mVcm−1 Oe−1 . The laminated composites exhibit the largest value of α ME, e.g., in PZT/Terfenol-D laminates, ME response achieves ~4.7 Vcm−1 Oe−1  or even 90 Vcm−1 Oe−1 in laminated PZT/Permendur composites . The magnetoelectric coupling is also observed in nanostructured multiferroic ceramic materials (e.g., YMnO3 ), semiconducting membranes galvanically filled with a magnetostrictive material (e.g., InP membrane filled with Ni ) as well as in nanocomposite thin films (e.g., CoFe2O4 polymer nanocomposite thin films ).
The synthesis of new, single-phase, multiferroic materials which exhibit high value of the magnetoelectric coupling coefficient is still a challenge. Until now, the best recognized single-phase multiferroic compound is bismuth ferrite BiFeO3 in which the ferroelectric and antiferromagnetic ordering coexist at ambient temperature (antiferromagnetic Néel temperature T N = 643 K, ferroelectric Curie temperature T C = 1100 K) . However, due to the cycloidal modulation of spin arrangement, the linear magnetoelectric effect in bismuth ferrite in the form of bulk polycrystalline sample is not observed. In thin films of BiFeO3, where spin cycloid disappears, a giant magnetoelectric coupling was observed, α ME ~ 3 Vcm−1 Oe−1, as reported in . Therefore, many current investigations tend to destroy the spin cycloid and to release the inherent magnetization in order to improve multiferroic properties of BiFeO3. This may be achieved, e.g., by structural modifications or deformations introduced by cation substitution or doping or creating of solid solutions of BiFeO3 with other materials with ABO3 type of structure.
where V OUT is the output voltage (induced between the sample surfaces due to the magnetoelectric effect) registered by the lock-in amplifier, t is the thickness of the sample (in the form of disk), H DC is the magnitude of the DC magnetic field produced by an electromagnet, and H AC is the amplitude of the small sinusoidal magnetic field superimposed onto the DC magnetic field [6, 33].
The aim of our studies was to compare the magnitude of magnetoelectric coupling in ceramic materials mentioned above and to determine the influence of the structure on the value of magnetoelectric response of a given material.
As recently reported, (BiFeO3)1 − x –(BaTiO3) x solid solutions exhibit maximum magnetoelectric coupling within a narrow composition range, i.e., x = 0.2–0.3 which is connected with the structural transformation of the samples from rhombohedral to cubic symmetry . As reported in our earlier work , the magnetoelectric properties of (BiFeO3)1 − x –(BaTiO3) x solid solutions are strongly dependent on the sintering temperature T and the highest magnetoelectric effect was observed for the sample with x = 0.3 sintered at T = 1153 K. Therefore, in current studies after the preliminary synthesis at 1123 K for 2 h, the sintering was performed at temperature T = 1153 K for 4 h. After that, the ceramics were annealed in air at a temperature of 823 K for 10 h and then cooled with a linear decrease in temperature (100 K h−1). Three samples with the barium titanate concentration x = 0.25, 0.4, and 0.5 were prepared in the form of disks with a diameter of 10 mm and 1-mm thickness. The concentrations of x = 0.25, 0.4, and 0.5 were selected in order to check whether there was a structural transformation in this range and for which barium titanate contents the maximum magnetoelectric coupling might be observed.
The ceramic disks with 10-mm diameter and 2-mm thickness were obtained after calcination at 1023 K for 10 h and sintering in air at a temperature of 1273 K for 24 h. The detailed information about the fabrication process has been published elsewhere in [36, 37].
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].
The crystalline structure of the sintered samples was investigated by X-ray diffraction (XRD) using the Philips PW3710 diffractometer with CoKα radiation or PANalytical Empyrean diffractometer using CuKα radiation. The phase and structural analysis of the recorded XRD patterns was performed with an X’Pert High Score Plus computer program equipped with the ICDD PDF data base and Rietveld method of the crystalline structure refinement.
The DC field was modulated by a small sinusoidal AC magnetic field produced by the Helmholtz coils. The voltage induced between the sample surfaces due to the magnetoelectric effect (ME signal) was transmitted to the lock-in amplifier. The amplifier is a key element of the system since it measures and transmits to the computer only this part of the ME signal which is in-phase with the AC modulation field of frequency f. Thus, the output signal (V OUT) measured as a function of the DC field intensity (H DC) gives an information about the ME effect at a low-AC magnetic field but for different working points of the magnetostrictive samples . The measurements of the α ME coefficient were performed by recording V OUT under the applied DC magnetic field of the magnitude H DC varying within the range of values from 0.1 to 4.5 kOe, while the amplitude H AC was constant during the experiment and it was equal to 5 Oe (which is significantly lower than H DC). The frequency f of the AC modulation field was equal to 1 kHz. In the case of (BiFeO3)1 − x –(BaTiO3) x solid solutions and the Aurivillius Bi5Ti3FeO15 compound, each sample was measured two times, before and after additional electrical poling, in order to verify how the initial polarization of the material affects its magnetoelectric properties. Poling was a process, in which a strong electric field (~3 kV mm−1) was applied across the sample at the increased temperature through 1 h before the measurement leading to align the randomly oriented dipoles into one direction. As proved in our earlier work , the parallel orientation of the applied electric field versus the magnetic one is better to maximize the value of the α ME coefficient. In the case of Bi1 − x Nd x FeO3 solid solutions, the measurements of α ME as a function of H DC were performed without initial electrical poling. Moreover, for all the samples, the frequency characteristics were collected in the range of 100 Hz–10 kHz. The measurable magnetoelectric effect was registered above 100 Hz. In the range of 100 Hz–1 kHz, the ME coupling increased rapidly and then stabilized above 1 kHz. Due to the inductance of the Helmholtz coils, the frequency range was limited up to 10 kHz. The kHz range of frequency is justified in the context of possible applications, mainly in energy harvesting devices.
Results and Discussion
Results of X-ray Diffraction Studies
The results of X-ray diffraction studies for Bi1 − x Nd x FeO3 solid solutions and the Aurivillius Bi5Ti3FeO15 compound have been published in our previous works [37–39]. It was found that with an increase of Nd content in Bi1 − x Nd x FeO3 solid solutions, within the range of x = 0.2–0.3, a structural phase transition from rhombohedral to orthorhombic system occurs. The obtained solid solutions were pure and homogeneous samples with very low concentration of secondary phases or without any impurities . In the case of the Bi5Ti3FeO15 compound, a pure Aurivillius phase with orthorhombic lattice (Fmm2 no. 42 space group) was obtained [38, 39].
The results of the Rietveld refinement method allowed us to conclude that all the obtained samples are no single-phase materials, namely, for x = 0.25, the diffractograms revealed two phases, i.e., rhombohedral R3c (75 %) and tetragonal P4mm (25 %) one. Unfortunately, due to the intensive signal from the sample holder, this estimation of the relative contribution of the phases is uncertain. In the case of x = 0.4, three phases were recognized, namely, rhombohedral R3c (51 %), cubic Pm3m (42 %), and tetragonal P4mm (7 %). Finally, XRD pattern for the sample with x = 0.5 revealed two phases, i.e., rhombohedral (51 %) and tetragonal (49 %). The obtained result is not fully consistent with the literature data. As reported in [40, 41], the crystallographic symmetry of (BiFeO3)1 − x –(BaTiO3) x solid solutions changes from rhombohedral for 0 < x < 0.3 to cubic for 0.3 < x < 0.93 and, finally, to tetragonal for x > 0.93. The structural transformation in sintered (BiFeO3)1 − x –(BaTiO3) x solid solutions from rhombohedral to cubic has been observed by us for the BaTiO3 concentration x = 0.3 . However, in the case of the analogous solid solutions prepared by us using the mechanical activation method and subsequent isothermal annealing , the structural transformation from rhombohedral to cubic symmetry occurred within the region of x = 0.4–0.7. Similarly, such gradual transformation was observed for (BiFeO3)1 − x –(SrTiO3) x solid solutions in Ref. , where the structural transformation proceeded for x = 0.5–0.7 with the multiphase region in between.
Magnetoelectric Effect in (BiFeO3)1 − x –(BaTiO3) x Solid Solutions
The experiment showed that the frequency dependence of the α ME coefficient exhibits a strong variability for f < 2 kHz. This effect can be caused by the discharge of electric charges accumulated on the surfaces of the investigated samples due to the resistance of the materials . Above the threshold of f = 2 kHz, the characteristics are almost flat for all the samples. The flat characteristic is preferred for the practical applications because it allows for a stable operation of the magnetoelectric device in a wide range of frequency. Thus, f = 2 kHz would be the optimum frequency for application of the investigated (BiFeO3)1 − x –(BaTiO3) x solid solutions, for example, as the AC magnetic field sensors.
The maximum value of α ME = 2.84 mVcm−1 Oe−1 achieved in this study for the electrically poled sample with x = 0.4 is higher even up to 85 % when compared with the previous results for the sample with x = 0.3 (α ME = 1.53 mVcm−1 Oe−1)  and about three times higher than the results reported by Yang for 0.75BiFeO3–0.25BaTiO3 (α ME = 0.87 mVcm−1 Oe−1) . It may be seen that the value of the α ME coefficient first increases with an increase of x which is connected with suppression of the cycloidal spin structure in BiFeO3. For x = 0.2–0.4, the magnitude of magnetoelectric coupling is practically constant and then decreases. Electrical poling allows increasing the value of α ME by 2–3 times what may be caused with the presence of the tetragonal phase. It may be supposed that multiphase structure of (BiFeO3)1 − x –(BaTiO3) x solid solutions for x = 0.25–0.5 promotes greater magnetoelectric coupling, especially after initial electrical poling of the samples.
Magnetoelectric Effect in Bi1 − x Nd x FeO3 Solid Solutions
It may be seen that α ME initially increases with an increase of x and reaches the maximum value α ME ~ 2.7 mVcm−1 Oe−1 for x = 0.2. This increase is attributed to quenching of the cycloidal spin structure of BiFeO3. Further increase of x causes monotonical decrease of α ME, and for x = 0.7–0.9, the ME signal was unmeasurably small. The changes of magnetoelectric coupling coefficient in Bi1 − x Nd x FeO3 solid solutions are accompanied with structural transformation from rhombohedral to orthorhombic system for x = 0.2–0.3.
Magnetoelectric Effect in the Aurivillius Bi5Ti3FeO15 Compound
As shown in the latest theoretical first-principles calculations, for the four-layer Aurivillius-phase Bi5Ti3FeO15 , there is a strong antiferromagnetic coupling between Fe3+ cations in the nearest-neighbor positions, characteristic of the superexchange interaction between d 5 cations (Fe-O-Fe). Moreover, the coupling between further neighbors is rather weak and becomes negligible beyond second neighbors. Due to the relatively low concentration of magnetic cations in Bi5FeTi3O15 and the short range of the magnetic superexchange interaction, it is unclear whether magnetic long-range order can occur in this system. Unexpectedly, our research shows that the magnetoelectric coupling in the Bi5Ti3FeO15 compound is relatively high. We suppose that the ME coupling in this single-phase material may be connected with short-range magnetic ordering of Fe-rich nano-regions, which mimic BiFeO3. Similar interpretation was reported for Bi5Ti3FeO15 thin films grown by pulsed layer deposition with a robust magnetoelectric coupling of 400 mVcm−1 Oe−1 .
On the basis of the performed studies, it may be stated that the best candidate for the single-phase room-temperature multiferroic material is the Aurivillius Bi5FeTi3O15 compound. Using solid-state sintering method, a pure single phase was successfully obtained. The ME effect in the Bi5FeTi3O15 compound is present despite the absence of long-range magnetic order, and relatively strong ME signal cannot be caused by tiny inclusions of other phases. The existence of the magnetoelectric coupling in the paramagnetic Aurivillius Bi5FeTi3O15 compound and explanation of mechanism of this coupling is open for future studies.
In the case of (BiFeO3)1 − x –(BaTiO3) x and Bi1 − x Nd x FeO3 solid solutions, the ME effect is connected with suppression of the cycloidal spin structure of BiFeO3. The magnitude of magnetoelectric coupling depends on the concentration of barium titanate and neodymium in the bismuth ferrite structure. The maximum values of the magnetoelectric coupling coefficient were obtained for the compositions within the region of structural transformations.
As it was shown, an initial electrical poling allows increasing the ME effect 2–3 times. The frequency dependencies of α ME have similar shapes for all the investigated materials and allowed us to determine the optimum frequency range, i.e., f ≥ 2 kHz for (BiFeO3)1 − x –(BaTiO3) x and Bi1 − x Nd x FeO3 solid solutions and f ≥ 5 kHz for the Aurivillius Bi5FeTi3O15 compound. Moreover, no hysteretic behavior was observed in α ME(H DC) dependence in the case of single-phase materials.
The authors are very grateful to Dr. Katarzyna Osińska from the Institute of Technology and Mechatronics, University of Silesia, Poland, for the preparation of the samples.
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- Spaldin NA, Fiebig M (2005) The renaissance of magnetoelectric multiferroics. Science 309:391View ArticleGoogle Scholar
- Spaldin NA, Cheong SW, Ramesh R (2010) Multiferroics: past, present, and future. Phys Today 63:38View ArticleGoogle Scholar
- Eerenstein W, Mathur ND, Scott JF (2006) Multiferroic and magnetoelectric materials. Nature 442:759View ArticleGoogle Scholar
- Khomskii DI (2006) Multiferroics: different ways to combine magnetism and ferroelectricity. J Magn Magn Mater 306:1View ArticleGoogle Scholar
- Fiebig M (2005) Revival of the magnetoelectric effect. J Phys D Appl Phys 38:R123View ArticleGoogle Scholar
- Rivera JP (2009) A short review of the magnetoelectric effect and related experimental techniques on single phase (multi-) ferroics. Eur Phys J B 71:299View ArticleGoogle Scholar
- Hur N, Park S, Sharma PA, Ahn JS, Guha S, Cheong S (2004) Electric polarization reversal and memory in a multiferroic material induced by magnetic fields. Nature 429:392View ArticleGoogle Scholar
- Kimura T, Goto T, Shintani H, Ishizaka K, Arima T, Tokura Y (2003) Magnetic control of ferroelectric polarization. Nature 426:55View ArticleGoogle Scholar
- Bichurin MI, Petrov VM, Petrov RV, Kiliba YV, Bukashev FI, Smirnov AY, Eliseev DN (2002) Magnetoelectric sensor of magnetic field. Ferroelectrics 280:199View ArticleGoogle Scholar
- Duc NH, Huong Giang DT (2008) Magnetic sensors based on piezoelectric magnetostrictive composites. J Alloy Compd 449:214View ArticleGoogle Scholar
- Huong Giang DT, Duc NH (2009) Magnetoelectric sensor for microtesla magnetic-fields based on (Fe80Co20)78Si12B10/PZT laminates. Sensor Actuat A-Phys 149:229View ArticleGoogle Scholar
- Dong S, Zhai J, Li JF, Viehland D, Priya S (2008) Multimodal system for harvesting magnetic and mechanical energy. Appl Phys Lett 93:103511View ArticleGoogle Scholar
- Bai X, Wen Y, Yang J, Li P, Qiu J, Zhu Y (2012) A magnetoelectric energy harvester with the magnetic coupling to enhance the output performance. J Appl Phys 111:07A938Google Scholar
- Srinivasan G, Priya S, Sun N (2015) Composite magnetoelectrics: materials, structures, and applications. Woodhead Publishing, CambridgeGoogle Scholar
- Bibes M, Barthelemy A (2008) Multiferroics: towards a magnetoelectric memory. Nat Mater 7:425View ArticleGoogle Scholar
- Hu J, Li Z, Wang J, Nan CW (2010) Electric-field control of strain-mediated magnetoelectric random access memory. J Appl Phys 107:093912View ArticleGoogle Scholar
- Shi Z, Wang C, Liu X, Nan C (2008) A four-state memory cell based on magnetoelectric composite. Chinese Sci Bull 53:2135View ArticleGoogle Scholar
- Fusil S, Garcia V, Barthelemy A, Bibes M (2014) Magnetoelectric devices for spintronics. AnnuRev Mater Res 44:91View ArticleGoogle Scholar
- Gajek M, Bibes M, Fusil S, Bouzehouane K, Fontcuberta J, Barthélémy A, Fert A (2007) Tunnel junctions with multiferroic barriers. Nat Mater 6:296View ArticleGoogle Scholar
- Martin LW, Chu YH, Zhan Q, Ramesh R, Han SJ, Wang SX, Warusawithana M, Schlom DG (2007) Room temperature exchange bias and spin valves based on BiFeO3/SrRuO3/SrTiO3/Si (001) heterostructures. Appl Phys Lett 91:172513View ArticleGoogle Scholar
- Ryu J, Carazo AV, Uchino K, Kim HE (2001) Magnetoelectric properties in piezoelectric and magnetostrictive laminate composites. Japan J Appl Phys 40:4948View ArticleGoogle Scholar
- Laletsin U, Padubnaya N, Srinivasan G, DeVreugd CP (2004) Frequency dependence of magnetoelectric interactions in layered structures of ferromagnetic alloys and piezoelectric oxides. Appl Phys A 78:33View ArticleGoogle Scholar
- Han TC, Hsu WL, Lee WD (2011) Grain size-dependent magnetic and electric properties in nanosized YMnO3 multiferroic ceramics. Nanoscale Res Lett 6:201View ArticleGoogle Scholar
- Gerngross MD, Carstensen J, Föll H (2012) Electrochemical and galvanic fabrication of a magnetoelectric composite sensor based on InP. Nanoscale Res Lett 7:379View ArticleGoogle Scholar
- Liu X, Liu S, Han MG, Zhao L, Deng H, Li J, Zhu Y, Krusin-Elbaum L, O’Brien S (2013) Magnetoelectricity in CoFe2O4 nanocrystal-P(VDF-HFP) thin films. Nanoscale Res Lett 8:374View ArticleGoogle Scholar
- Catalan G, Scott JF (2009) Physics and applications of bismuth ferrite. Adv Mater 21:2463View ArticleGoogle Scholar
- Wang J, Neaton JB, Zheng H, Nagarajan V, Ogale SB, Liu B, Viehland D, Vaithyanathan V, Schlom DG, Waghmare UV, Spaldin NA, Rabe KM, Wuttig M, Ramesh R (2003) Epitaxial BiFeO3 multiferroic thin film heterostructures. Science 299:1719View ArticleGoogle Scholar
- Park T-J, Papaefthymiou GC, Viescas AJ, Lee Y, Zhou H, Wong SS (2010) Composition-dependent magnetic properties of BiFeO3-BaTiO3 solid solution nanostructures. Phys Rev B 82:024431View ArticleGoogle Scholar
- Zhang Y, Zhang H, Yin J, Zhang H, Chen J, Wang W, Wu G (2010) Structural and magnetic properties in Bi1-xRxFeO3 (x=0-1, R=La, Nd, Sm, Eu and Tb) polycrystalline ceramics. J Magn Magn Mater 322:2251View ArticleGoogle Scholar
- Mathe VL, Patankar KK, Patil RN, Lokhande CD (2004) Synthesis and dielectric properties of Bi1-xNdxFeO3 perovskites. J Magn Magn Mater 270:380View ArticleGoogle Scholar
- Lomanova NA, Semenov VG, Panchuk VV, Gusarov VV (2012) Structural changes in the homologous series of the Aurivillius phases Bin+1Fen−3Ti3O3n+3. J Alloy Compd 528:103View ArticleGoogle Scholar
- Srinivas A, Suryanarayana SV, Kumar GS, Mahesh Kumar M (1999) Magnetoelectric measurements on Bi5FeTi3O15 and Bi6Fe2Ti3O18. J Phys Condens Mat 11:3335View ArticleGoogle Scholar
- Duong GV, Groessinger R, Schoenhart M, Bueno-Basques D (2007) The lock-in technique for studying magnetoelectric effect. J Magn Magn Mater 316:390View ArticleGoogle Scholar
- Yang SCh, Kumar A, Petkov V, Priya S (2013) Room-temperature magnetoelectric coupling in single-phase BaTiO3-BiFeO3 system. J Appl Phys 2013, 113:144101-1Google Scholar
- Kowal K, Jartych E, Guzdek P, Lisinska-Czekaj A, Czekaj D (2015) Magnetoelectric effect in (BiFeO3)x–(BaTiO3)1-x solid solutions. Mat Sci Pol 33:107Google Scholar
- Dzik J, Lisinska-Czekaj A, Zarycka A, Czekaj D (2013) Study of phase and chemical composition of Bi1-xNdxFeO3 powders derived by pressureless sintering. Arch Metall Mater 58:1371Google Scholar
- Pikula T, Dzik J, Lisinska-Czekaj A, Czekaj D, Jartych E (2014) Structure and hyperfine interactions in Bi1-xNdxFeO3 solid solutions prepared by solid-state sintering. J Alloy Compd 606:1View ArticleGoogle Scholar
- Jartych E, Mazurek M, Lisinska-Czekaj A, Czekaj D (2010) Hyperfine interactions in some Aurivillius Bim+1Ti3Fem-3O3m+3 compounds. J Magn Magn Mater 322:51View ArticleGoogle Scholar
- Pikula T, Guzdek P, Dzik J, Lisinska-Czekaj A, Jartych E (2015) X-ray diffraction, Mössbauer spectroscopy, and magnetoelectric effect studies of multiferroic Bi5Ti3FeO15 ceramics. Acta Phys Pol 127:296View ArticleGoogle Scholar
- Chandarak S, Unruan M, Sareein T, Ngamjarurojana A, Maensiri S, Laoratanakul P, Ananta S, Yimnirun R (2009) Fabrication and characterization of (1–x)BiFeO3-xBaTiO3 ceramics prepared by a solid state reaction method. J Magnetics 14:120View ArticleGoogle Scholar
- Ismailzade IH, Ismailov RM, Alekberov AI, Salaev FM (1981) Investigation of the magnetoelectric (ME)H effect in solid solutions of the systems BiFeO3-BaTiO3 and BiFeO3-PbTiO3. Phys Stat Sol A 68:K81View ArticleGoogle Scholar
- Kowal K, Jartych E, Guzdek P, Stoch P, Wodecka-Dus B, Lisinska-Czekaj A, Czekaj D (2013) X-ray diffraction, Mössbauer spectroscopy, and magnetoelectric effect studies of (BiFeO3)x-(BaTiO3)1-x solid solutions. Nukleonika 58:57Google Scholar
- Malesa B, Antolak-Dudka A, Oleszak D, Pikula T (2015) Structure and Mössbauer spectroscopy studies of mechanically activated (BiFeO3)1-x-(BaTiO3)x solid solutions. Nukleonika 60:109View ArticleGoogle Scholar
- Goossenes DJ, Weekes CJ, Avdeev M, Hutchison WD (2013) Crystal and magnetic structure of (1-x)BiFeO3-xSrTiO3 (x=0.2, 0.3, 0.4, and 0.8). J Solid State Chem 207:111View ArticleGoogle Scholar
- Jartych E, Pikula T, Mazurek M, Lisinska-Czekaj A, Czekaj D, Gaska K, Przewoznik J, Kapusta C, Surowiec Z (2013) Antiferromagnetic spin glass-like behavior in sintered multiferroic Aurivillius Bim+1Ti3Fem-3O3m+3 compounds. J Magn Magn Mater 342:27View ArticleGoogle Scholar
- Birenbaum AY, Ederer C (2014) Potentially multiferroic Aurivillius phase Bi5FeTi3O15: cation site preference, electric polarization, and magnetic coupling from first principles. Phys Rev B 90:214109View ArticleGoogle Scholar
- Zhao H, Kimura H, Cheng Z, Osada M, Wang J, Wang X, Dou S, Liu Y, Yu J, Matsumoto T, Tohei T, Shibata N, Ikuhara Y (2014) Large magnetoelectric coupling in magnetically short-range ordered Bi5Ti3FeO15 film. Sci Rep 4:5255Google Scholar
- Jartych E, Pikula T, Kowal K, Lisinska-Czekaj A, Czekaj D (2014) Mössbauer spectroscopy and magnetoelectric effect studies of multiferroic ceramics based on BiFeO3. Key Eng Mater 602–603:936View ArticleGoogle Scholar