Distorted Perovskite Structure Research Articles

Structure evolution and microwave dielectric characteristics of Ca[(AlxGa0.5-xNb0.5)0.5Ti0.5]O3 ceramics

The microwave dielectric characteristics of Ca[(AlxGa0.5-xNb0.5)0.5Ti0.5]O3 (x = 0, 0.1, 0.2, 0.4, 0.5) ceramics were investigated together with the structure evolution. Distorted perovskite structure in space group Pbnm with b-b-c+ tilting was determined for the present solid solutions, where the microstructures were remarkably affected by Al-content. Owing to the Al-substitution which was accompanied by the subdued octahedral tilting, the Qf value reached up to 40,000 GHz with increasing x, the dielectric constant (εr) remained at around 50, and the temperature coefficient of resonant frequency (τf) could be adjusted to near zero. Low-loss temperature-stable microwave dielectric ceramics with medium dielectric constant were obtained at x = 0.2–0.5, which exhibited Qf values of 35,900–40,000 GHz, εr of 49.2–53.4, and τf of 0.6–3.5 ppm/°C.

Analysis of Crystal Structure of BaCe0.80Y0.20O3-δ at Room Temperature with Various Diffraction Technique

At present, operating temperature of solid oxide fuel cells (SOFCs) is as high as 800-1000 ° C due to requirement of sufficient oxide ion conductivity of electrolyte material. Under such high temperature operation, there remain problems of reliability, durability and limitation of materials. Development of electrolyte oxide which exhibits enough ionic conductivity at temperatures between 400-600 ºC should be required to solve the problems, resulting in development of so-called intermediate temperature SOFC (IT-SOFC). One of the probable methods to decrease the operation temperature is employing proton conducting oxide as electrolyte instead of oxide ion conducting oxide since lower energy is required for light proton transportation. Among proton conducting oxides, BaCe1−x Y x O3-δ shows the highest proton conductivity. Not only for practical application but also for elucidation of high proton conduction mechanism, information on accurate crystal structure of BaCe1−x Y x O3-δ is essential. So far, it has been reported that crystal structures of BaCe1-x Y x O3-δ are orthorhombic distorted perovskite and monoclinic distorted one for x=0.00-0.10 and x=0.15-0.20, respectively, at room temperature. The crystal structures have mainly been analyzed with Rietveld analyses of powder X-ray diffraction or neutron diffraction patterns. However, space groups employed for Rietveld analyses were not experimentally evidenced ones but assumed to be Pnma (No. 62) and I2/m (No. 12) for orthorhombic and monoclinic phase, respectively, in the most studies reported so far. In this study, we have clarified the space group of BaCe0.80Y0.20O3- δ by convergent beam electron diffraction. In addition, Rietveld analyses of powder X-ray diffraction and neutron diffraction patterns of BaCe0.80Y0.20O3- δ have been examined to elucidate minute crystal structure. BaCe0.80Y0.20O3-δ was prepared with Pechini method, with starting materials of BaCO3, CeO2 and Y2O3. BaCO3 was dissolved with citric acid. CeO2 and Y2O3 were dissolved with dilute HNO3 containing H2O2. After addition of ethylene glycol to mixed solution with stoichiometric cation composition, the solution was heated at 300 °C and burned to resin. The resin was calcined at 700 °C for 24 hour in air, followed by uniaxially pressing into pellets. The pellets were sintered at 1300~1400 °C for 10 hour in air. The obtained phase was revealed to be a single phase of monoclinic distorted perovskite structure with a=6.239 Å, b=8.740 Å, c=6.249 Å and β=91.06 º by X-ray diffraction measurement. Convergent beam electron diffraction (CBED) patterns were obtained at room temperature by using energy filtered TEM (JEOL Co., Ltd.: JEM-2010FEF) with operating voltage of 100 kV. X-ray diffraction pattern was obtained with RINT-2500 (Rigaku Co., Ltd.: CuKα, 50 kV, 250 mA). TOF neutron diffraction measurement was carried out using superHRPD at J-PARC. The Rietveld refinements for X-ray diffraction pattern and neutron diffraction one were carried out using RIETAN-FP [1] and Z-Rietveld [2], respectively. Figure attached shows zero-order Laue zone reflections of CBED pattern of BaCe0.80Y0.20O3-δ from [001] azimuth. The observation of the disc identified as 0k0 with odd k denied I-lattice. Space group of I2/m was also denied from A2-type dynamical extinction indicated by arrows, indicating existence of screw axis or glide plane. Combining various CBED patterns from various azimuths, space group of BaCe0.80Y0.20O3-δ was concluded to be P21/m (No. 11), which was a subgroup of Pnma (No. 62) of BaCeO3 [3]. It can be explained that substitution of Y and/or generation of oxide ion vacancy decreased crystal symmetry of BaCeO3. The both X-ray diffraction pattern and the neutron diffraction pattern could successfully be refined by Rietveld analysis with structure model of both I2/m and P21/m. This indicates that accurate space group cannot be clarified by only Rietveld analysis of powder diffraction patterns. The tilts of octahedrons of perovskite were represented as “a + b - c -“ and “a 0 b - c -“ for P21/m and I2/m, respectively [3]. It can be speculated that tilt angle according to a-axis in P21/m phase is so small that diffraction patterns of BaCe0.80Y0.20O3- δ can be refined by Rietveld analysis with space group of both I2/m and P21/m. [1] F. Izumi and K. Momma, Solid State Phenom., 130 (2007) 15. [2] R. O-Tomiyasu et. al. J. Appl. Cryst., 45 (2012) 299. [3] C. J. Howard and H. T. Stokes, Acta Cryst. B54 (1998) 782. Figure 1

XRD, Raman and magnetic studies of Bi1−xLaxFeO3 solid solution obtained by mechanochemical synthesis

ABSTRACTBi1 − xLaxFeO3 single-phase solid solution with 0 ≤ x ≤ 0.3 was obtained by mechanochemical synthesis and characterized by X-ray diffraction, FT NIR Raman spectroscopy and magnetic studies. The nanocrystalline powders of rhombohedrally distorted perovskite structure R3c were studied ‘as synthesized’ by mechanosynthesis and after annealing at 500 °C for 1 h. The annealing, which resulted in recrystallization of the amorphous shell of the nanograins, was found to modify the external lattice modes of Bi1−xLaxFeO3 and resulted in changes in the temperature variation of the magnetization.

Enhanced dielectric and magnetic properties in multiferroic [formula omitted] ceramic

An enhanced low-frequency dielectric constant, (ε′∼104), and ferromagnetic behavior at room temperature were observed in Bi0.99Y0.01Fe0.99Ni0.01O3 (BYFNO) ceramic sintered by a modified solid state reaction method. The anti-ferromagnetic (AFM) nature of BiFeO3 (BFO) changed to ferromagnetic (FM) with saturation magnetization, Ms, and coercivity Hc values of ∼0.03μB/f.u. and ∼250Oe, respectively at room temperature. The XRD patterns revealed that the co-doping of Y3+ and Ni2+ ions at the A− and B− sites of BiFeO3 (BFO) resulted in a rhombohedrally distorted perovskite structure. This result was discussed in terms of the modification of the cycloidal spin structure, presence of Ni2+ carriers and preservation of oxygen vacancy during the sintering process. This enhanced properties entitle the Bi0.99Y0.01Fe0.99Ni0.01O3 one of the few multiferroic materials that exhibits both significant ferromagnetic and dielectric behaviors at room temperature.

Effect of Synthesis Techniques on Magneto-Transport Properties of Sodium-Doped Lanthanum Manganites

The effect of synthesis techniques on the structural, magnetic and magneto-transport properties of La1−x Na x MnO3 (x = 0.1 and 0.2) manganites has been investigated. The samples were prepared using two different techniques: sol-gel and poly vinyl alcohol (PVA) precursor methods. X-ray diffraction studies indicate a rhombohedrally distorted perovskite structure having R3-c space group. The particle sizes of all the samples are in the nanometer range. A ferromagnetic insulating (FMI) behavior has been observed for x = 0.10 manganite synthesized using sol-gel technique while poly vinyl alcohol precursor method shows ferromagnetic metallic (FMM) behavior. A large magnetoresistance has been observed at low temperature region for x = 0.10 sample prepared using sol-gel method. The room temperature magnetoresistance values of sol-gel-prepared samples are found to be higher than that compared to PVA precursor method. Finally, theoretical work on magnetocaloric properties of the samples at ferro to paramagnetic state is presented and the results are explained qualitatively.

Evidencing the magnetoelectric coupling in Bi1-xNdxFeO3 compositions through ferroic characterizations

ABSTRACTThe study of multiferroic crystalline materials is of great technological and academic interest due to the correlation between their ferroelectric and ferromagnetic properties. In this work, ferroic properties of Nd-modified (A-site substitution) BiFeO3 (BNFO) compounds were studied. Ceramic compositions of Bi1-xNdxFeO3 (x = 0.10 and 0.20) were obtained through a route that included high-energy ball milling, isostatic pressing (to obtain the ceramic shape) and sintering in air. The X-ray diffraction data showed that these compositions have a distorted perovskite structure, with relative densities reaching 93%. Dielectric measurements showed a frequency independent step-like relaxation for the Bi0.9Nd0.1FeO3 composition and indicatives indications of thermally activated conduction processes for the Bi0.8Nd0.2FeO3 composition. Magnetic studies showed a breakdown of the typical magnetic cycloidal structure of BiFeO3.

Structural and impedance spectroscopic analysis of Sr/Mn modified BiFeO3 multiferroics

Glycine + urea are used as fuel agents to synthesize polycrystalline nano-particles of as-burnt Bi0.9Sr0.1FeO3 and Bi0.9Sr0.1Fe1−xMnxO3 (x = 0, 0.05, 0.10, 0.15 and 0.20) multiferroic samples using sol–gel auto-combustion method, at relatively low temperature. Structural analysis exhibits the formation of phase pure nano-composites having rhombohedral distorted perovskite structure belonging to space group R3c. Doping of Sr and Mn didn’t disturb the crystal symmetry of the original composite. Field emission scanning electron microscopy revealed that the grains which were initially interlinked with each other became relatively isolated, uniformly distributed and spherical shaped with increasing Mn contents along with increased intergranular porosity. Energy dispersive X-ray spectroscopy confirms the at.% and wt% of all the elements, corresponding to each stoichiometric formula. Dielectric parameters for each sample depict conventional ferrite behavior while hopping of oxygen vacancies contributes a lot in conductivity of the samples. Contribution of grains, grain boundaries and interfaces are evident from impedance spectroscopy. Non-Debye type relaxation is confirmed from the frequency dependent electric modulus and Cole–Cole plots. A solid correlation has been established between electrical properties and microstructure of the samples under investigation.

Improved structure stability, optical and magnetic properties of Ca and Ti co-substituted BiFeO3 nanoparticles

We report the optical and magnetic properties of single-crystalline Ca and Ti co-substituted bismuth ferrite, Bi1-xCaxFe1-xTixO3, nanoparticles, synthesized by a facile sol–gel methodology in the compositional range wherein 0≤x≤0.25. X-ray diffraction (XRD) and transmission electron microscopy (TEM) investigations show that all samples possess a rhombohedrally distorted perovskite structure with space group R3c. Ca and Ti co-substitution controls the formation of secondary phases and improved the stability of perovskite phase of BiFeO3. The average particle size was estimated by Williamson Hall plot, confirmed by TEM, and found to be about 59, 50, 46, 41, 40 and 38nm of Bi1-xCaxFe1-xTixO3 for x=0, 0.05, 0.10, 0.15, 0.20 and 0.25, respectively. The UV–vis absorption study reveal the strong absorption of visible light with a small optical band gap (1.77–2.25eV) for 0≤x≤0.25 indicates a possibility of utilizing for photocatalytic activities. The magnetic study at room-temperature displays the improved magnetization and coercive field in Bi1-xCaxFe1-xTixO3 nanoparticles due to the release of the latent magnetization locked within the toroidal spin structure of BiFeO3.

Influence of lightly Sm-substitution on crystal structure, magnetic and dielectric properties of BiFeO3 ceramics

Multiferroic Bi1−xSmxFeO3 (x = 0.00–0.05) ceramics were prepared by a conventional solid-state reaction method, and effects of Sm3+ ions on crystal structure, magnetic and dielectric properties were investigated. TGA-DSC studied the synthesis process of pure BiFeO3 sample and confirmed the synthesis temperature was about 825 °C. For all samples, they were rhombohedral distorted perovskite structure of R-3c space group. Lattice constants and particle sizes decreased based on the data of XRD and Rietveld refinement. Morphologies of the samples were determined with Scanning Electron Microscopy proving the grain to be shrinkage. With increasing of Sm3+ ions, saturation magnetization of Bi0.97Sm0.03FeO3 material at 5000 Oe was about 1.5 times larger than that of pure BiFeO3, while the coercivity increased from 87.3 Oe to 121.3 Oe. In a wide range frequency from 1 MHz to 1.6 GHz, dielectric constant kept a stable value. With Sm3+ increasing, dielectric constant increased from 27 to 46, while dielectric loss kept a low value.

Probing Dy3+ magnetic moments in multiferroic perovskite DyMnO3 by optical spectroscopy

We present a detailed temperature‐dependent (4–300 K) spectroscopic study of DyMnO3 single crystals with distorted perovskite structure. Energies of 36 crystal‐field levels of Dy3+ in paramagnetic DyMnO3 were determined. The Dy3+ ground Kramers doublet does not split at and splits below Tlock = 18 K. The splitting grows fast at temperatures near and reaches Δ0 ≈ 11 ± 2 cm–1 at 4 K. Using the experimental temperature dependence Δ0(T), we calculate the dysprosium magnetic moment mDy(T) and the dysprosium contribution into specific heat and magnetic susceptibility. Analysing all the experimental data, we conclude that the Dy–Mn interaction is of the Dzyaloshinskii–Moriya type. Intensity map in the temperature–wave number coordinates for a spectral line corresponding to the f–f transition of Dy3+ in DyMnO3 and a scheme of the splitting of the Dy ground Kramers doublet. Arrows represent Dy magnetic moments.magnified imageIntensity map in the temperature–wave number coordinates for a spectral line corresponding to the f–f transition of Dy3+ in DyMnO3 and a scheme of the splitting of the Dy ground Kramers doublet. Arrows represent Dy magnetic moments.

Crystal structure and magnetic behavior of the La0.1Bi0.9FeO3 compound

The nano-crystalline La0.1Bi0.9FeO3 compound was successfully synthesized by starch-based combustion method. The crystal structure and magnetic behavior were studied by temperature-dependent X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and magnetic measurements. The La0.1Bi0.9FeO3 compounds crystallized in a rhombohedrally distorted perovskite structure with space group R3c. The substitution of La for Bi reduced the rhombohedral distortion. The structural phase transitions in La0.1Bi0.9FeO3 driven by temperature showed that the extraordinary two-phase coexistence state of BiFeO3 and LaFeO3 was observed in a narrow temperature range of 630–700 °C. The magnetization of the La0.1Bi0.9FeO3 sample was improved by heat treatment in the temperature range. When the heat treatment temperatures rose from 25 to 600 °C, the remanence (Mr) and coercivity (Hc) of the La0.1Bi0.9FeO3 compound almost remained the same, and increased rapidly to 0.134 emu/g and 7.1 KOe on further increasing the heat treatment temperature to 650 °C.

Magnetic, Dielectric and Complex Impedance Properties of xBa0.95Sr0.05TiO3–(1 − x)BiFe0.9Gd0.1O3 Multiferroic Ceramics

xBa0.95Sr0.05TiO3–(1 − x)BiFe0.9Gd0.1O3 [xBST–(1 − x)BFGO] (x = 0.00, 0.10, 0.20 and 0.25) multiferroic ceramics were prepared by the standard solid-state reaction technique. Structural characterization was performed by X-ray diffraction. All the samples showed rhombohedral distorted perovskite structure. Surface morphology of the ceramics was studied by the field emission scanning electron microscope (FESEM). From the FESEM observation, the grain size was observed to be decreased with increasing BST content. Enhanced magnetic properties were observed in BFGO with the increase in BST content because of large lattice distortion. The complex initial permeability increased with the increasing of BST content. The study of dielectric properties showed that the dielectric constant increased, whereas dielectric loss decreased with increasing of BST content due to the reduction of oxygen vacancies. An analysis of the electric impedance and modulus with frequency was performed at different temperatures. Non-Debye-type relaxation processes occur in the compound which was confirmed from the nature of the Cole–Cole plot. The DC conductivity was found to increase with the rise in temperature which indicates the semiconducting behavior of the compound with characteristics of the negative temperature coefficient of resistance. The activation energy, responsible for the relaxation determined from the modulus spectra (0.246 eV), was found to be almost same as the value obtained from the impedance study (0.240 eV), indicating that charge carriers overcome the same energy barrier during relaxation. The frequency response of imaginary parts of electric impedance and modulus suggested that the relaxation in xBST–(1 − x)BFGO ceramics follows the same mechanism at various temperatures.

Crystal structure, phase transitions, and magnetic properties of titanium doped La0.5Sr0.5MnO3 perovskites

The current paper investigates the effect of titanium substitution on the structure as well as the magnetic properties of La0.5Sr0.5Mn1−xTixO3 (0≤x≤0.5) polycrystalline powder. The samples studied crystallize in a distorted perovskite structures of tetragonal (space group I4/mcm) symmetry with octahedral tilting scheme (a0a0c−), leading to the absence of octahedral tilting all along two perovskite main directions and to an out-of-phase along the third direction, or rhombohedral (space group R3¯c) symmetry with octahedral tilting scheme (a−a−a−) yielding to out-of-phase along the three perovskite main directions. As the Ti content increases, a better matching of the (Mn/Ti)–O distances and (Mn/Ti)–O–(Mn/Ti) bond angle occurs. This phenomenon is created by an elongation of the (Mn/Ti)–O distance, as Mn4+ is substituted by the larger ion Ti4+. In the whole compositional range, the symmetry-adapted to atomic displacements, responsible for the out-of-phase tilting of the (Mn/Ti)O6 octahedra, stays active, anticipating tetragonal-to-rhombohedral phase transition. Taking in to account what has been explained above, measurements of magnetic properties show a decrease of magnetic ordering temperature when Ti content increases, which in turn leads to the diminution of the exchange interaction caused by reducing the FM coupling and the replacement of neighboring manganese Mn3+–O–Mn4+ by Mn3+–O–Ti4+ bonds. This phenomenon results in broadening of the paramagnetic to ferromagnetic phase transition range. Further changes in magnetic properties with the increase in Ti concentration are studied.

Magnetocaloric effect and refrigerant capacity in polycrystalline YCrO3

Rare earth orthochromites (RCrO3) have attracted much interest in recent years due to their physical properties which arise from the orthorhombically distorted perovskite structure. They also show great potential application as multifunctional materials. In this work we present the results of structural, dc magnetisation measurements and magnetocaloric properties for YCrO3 hard magnet. The magnetocaloric effect was investigated by means of field dependence magnetisation measurements in a temperature range from 98K to 182K. The magnetic entropy change, −ΔSM=0.36Jkg−1K−1, and the refrigerant capacity, RC=7.1Jkg−1, was obtained near the transition temperature TN=140K, for applied fields up to 50kOe.

Effect of Mn doping on crystal structure, dielectric and magnetic ordering of Bi0.8Ba0.2FeO3 multiferroic

Bi0.8Ba0.2Fe1−xMnxO3 (x=0.0, 0.1, and 0.2) multiferroics were synthesized by the conventional solid state reaction method. Structural characterization was performed using powder X-ray diffraction at room temperature which shows that all samples possess a rhombohedrally distorted perovskite structure described by the space group R3c. Rietveld refinement confirmed a good agreement between the observed and calculated patterns. Magnetic measurements were carried out at room temperature up to a field of 15kOe. Ba and Mn co-substitution transformed antiferromagnetic BFO into ferromagnetic. This transformation is related to partial modification in the structure. Dielectric response of all synthesized samples was analyzed in the frequency range 10Hz to 5MHz at different temperatures by impedance/gain phase analyzer. The value of dielectric constant and dielectric loss show dispersion at low frequency for various temperatures in all the samples. For 10% substitution of Mn, έ increases and tanδ decreases significantly.

Microstructure and electrical properties mediated by defects in Na0.5Bi0.5Ti0.98Mn0.02O3 thin film under different annealing atmospheres

Na0.5Bi0.5Ti0.98Mn0.02O3 (NBTMn) thin films were deposited on the indium tin oxide/glass substrates annealed under various atmospheres (N2, air, O2) using chemical solution deposition. The effect of annealing atmosphere on microstructure and electrical properties were investigated. All the NBTMn thin films crystallize into the single-phase rhombohedral distorted perovskite structure with a competitive growth mode among various orientations. With the decrease of the content for oxygen vacancies in O2, the improved insulating property and enhanced ferroelectricity (Pr=38μC/cm2) can be obtained in NBTMn thin film. Also, the relative dielectric constant and loss tangent are 501 and 0.04 at 100kHz, respectively. The evolution of performances for NBTMn film annealed at different ambiences can be analyzed in terms of defect dipoles and free oxygen vacancies based on defect chemistry.

The effect of Fe–O–Fe bond angle on modulating multiferroic properties of Ba–K-codoped BiFeO3 nanoparticles

Bi0.9−x Ba0.1K x FeO3 (x = 0, 0.01, 0.02) nanoparticles have been successfully prepared using sol–gel method. X-ray diffraction data revealed rhombohedral distorted perovskite structure for all samples. The magnetization and the leakage current density both increased with K doping. Space charge limited conduction was found to be the dominant mechanism in whole electric field for all the samples investigated by plotting log J versus log E. In addition, the band gaps of all nanoparticles were investigated and the values showed no obvious change with the increase of K content due to the interplay of oxygen vacancies and bond angle of Fe–O–Fe. The dielectric properties including the dielectric constant and loss were also investigated.

Antisymmetric exchange in La-substituted BiFe0.5Sc0.5O3 system: symmetry adapted distortion modes approach

Abstract Neutron powder diffraction measurements on the 35 % La-substituted Bi1−x La x Fe0.5Sc0.5O3 composition revealed that the samples obtained under high-pressure (6 GPa) and high-temperature (1500 K) conditions crystalize into a distorted perovskite structure with the orthorhombic Pnma symmetry and the unit cell parameters: a o = 5.6745(2) Å, b o = 7.9834(3) Å and c o = 5.6310(2) Å. A long-range magnetic ordering takes place below 220 K and implies a G-type magnetic structure with the moments 4.10(4)μ B per Fe aligned predominately along the orthorhombic c-axis. The space group representation theory using the orthorhombic symmetry yields four bi-linear coupling schemes for the magnetic order parameters imposed by antisymmetric exchange interactions. The couplings are analysed based on symmetry adapted distortion modes defined in respect of the undistorted cubic perovskite structure. The approach allows a quantitative estimation of the coupling strength. It is shown that the experimentally found spin configuration combines the magnetic order parameters coupled by the atomic displacement modes with the largest amplitudes. The results indicate that the antisymmetric exchange is the dominant anisotropic term which fully controls the direction of the Fe3+ spins in the distorted perovskite lattice.

Effect of La and Sr co-doping on electric and magnetic properties of multiferroic La0.1Bi0.9−xSrxFeO(3−x/2) ceramics

[Formula: see text] ceramics were synthesized by solid-state reaction method, and their magnetic properties and conductive characteristics were investigated and discussed. It is found that La-doped [Formula: see text] ceramic without [Formula: see text] doping is a rhombohedrally distorted perovskite structure, and with the increase of the [Formula: see text] concentration, the phase transits gradually from rhombohedral to pseudo cubic symmetry. Electrical and magnetic properties show strong dependence on [Formula: see text] dopant level. The measurement demonstrates that [Formula: see text] with 30% [Formula: see text] dopant exhibits the lowest values of the leakage current, dielectric constant [Formula: see text] and dielectric loss [Formula: see text]. And the highest value of saturation magnetization of about 4.5 emu/g is observed in 60% Sr-doped [Formula: see text]. An abnormal enhancement of the conductivity was observed in [Formula: see text] ceramics with [Formula: see text] = 0.60 and 0.70, and their magnitude of conductivity is nearly six orders larger than that of pure [Formula: see text].

Structural, Ferroelectric and Ferromagnetic Properties of Single-Phase Bi0.95Ba0.05FeO3 Thin Film Prepared by Pulsed Laser Deposition

Single-phase Bi0.95Ba0.05FeO3 (BBFO) thin film was grown on Si (111) substrate by a pulsed laser deposition method. The analysis of crystal structure identifies that the BBFO thin film has a rhombohedrally distorted perovskite structure with R3c space group. The morphologies investigated by high-resolution field emission transmission electron microscopy and atomic force microscopy reveal that the BBFO thin film is polycrystalline and consists of uniform grains with an average size of about 110 nm, of which surfaces are smooth. Ferroelectric property of the BBFO thin film was analyzed and the remnant polarization (Pr) is about 3.9 μC cm−2. Magnetic measurements reveal that the BBFO thin film has a strong ferromagnetic behavior at room temperature with a 36.76 emu cm−3 saturated magnetization (Ms) and 2998 Oe coercivity. Furthermore, the original mechanisms of ferroelectric and ferromagnetic properties were discussed. This work is believed to contribute a novel multiferroic material, which should open a way toward the integration of multiferroic material and semiconductor material for future tunable multifunctional devices.