Synthesis and multiferroic properties of Bi0.8A0.2FeO3 (A=Ca,Sr,Pb) ceramics

Khomchenko, V. A.; Киселев, Д. А.; Vieira, J.M.; Kholkin, A. L.; Sá, M.A.; Pogorelov, Yu. G.

doi:10.1063/1.2747665

Cited by 177 publications

(111 citation statements)

References 16 publications

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“…This type of dielectric anomaly is predicted by the Landau-Devonshire theory of phase transition in magnetoelectrically ordered systems as an influence of vanishing magnetic order on the electric order [49]. Such a transition have also been observed for Mn [50], Eu [51], Dy [52] and NaNbO 3 [21] doped BFO at different temperatures. This anomaly in permittivity indicates the coupling between the ferroelectric and magnetic orders which are essential in bismuth ferrite based multiferroic.…”

Section: Resultsmentioning

confidence: 67%

Synthesis of nano-structured Bi1−xBaxFeO3 ceramics with enhanced magnetic and electrical properties

Mostafavi

Ataie

Ahmadzadeh

et al. 2015

Materials Chemistry and Physics

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Bi 1−x Ba x FeO 3 (x=0, 0.2) compounds were synthesized by conventional solid-state reaction method. Structural, morphological, magnetic and ferroelectric properties of the products were investigated systematically by employing X-ray diffraction, field emission scanning electron microscope, vibrating sample magnetometer as well as electrical evaluation techniques, respectively. The XRD results demonstrated distorted rhombohedral BiFeO 3 crystal structure with the space group of R3c. However, 20wt% Ba doped sample underwent a structural phase transition from rhombohedral to distorted pseudo-cubic structure. FESEM images of the BiFeO 3 sample calcined at 850°C showed agglomerated nano-particles with a mean particle size of 60 nm, while Bi 0.8 Ba 0.2 FeO 3 sample showed uniform cubic particles with a mean particle size of 220 nm. For Bi 0.8 Ba 0.2 FeO 3 sample calcined at 850˚C, an anomaly in permittivity was observed in the vicinity of 370˚C which is around the Neel temperature of bismuth ferrite and is in agreement with the recent reports.

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Section: Resultsmentioning

confidence: 67%

Synthesis of nano-structured Bi1−xBaxFeO3 ceramics with enhanced magnetic and electrical properties

Mostafavi

Ataie

Ahmadzadeh

et al. 2015

Materials Chemistry and Physics

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“…The clear nonappearance of magnetoelectric coupling at lower temperature ͑below FM T c ͒ can be attributed to the collinear magnetic ordering, as in the case of hexaferrites. 9 In this letter, the ferroelectric as well as magnetocapacitance measurements on these samples have been carried out in the high frequency range starting from 100 kHz, much more than the frequencies corresponding the time constants ͑RC͒ suggested by the Catalan 17 and Scott. 18 This rules out a possibility of magnetocapacitance due to magnetoresistance combined with the Maxwell-Wagner effect which has been the subject of debate on multiferroics showing magnetocapacitance.…”

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confidence: 99%

“…7 One such alternative followed is the induction of nonmagnetic ions having stereochemically active lone pair of electrons that may introduce off centering in the structure containing transition metal ions. 9 Also, spin-phonon coupling that may lead to dielectric anomalies has been envisaged for geometrically frustrated ZnCr 2 O 4 spinel. 10 Multiferroicity in conventional spinel oxides has been predicted 11 and studied.…”

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confidence: 99%

Magnetoelectric properties of BixCo2−xMnO4 (⩽x⩽0.3)

Rajeevan

Pradyumnan

Kumar

et al. 2008

Applied Physics Letters

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We present the structural, dielectric and magnetization study of single phase polycrystalline Bi x Co 2−x MnO 4 ͑0 ഛ x ഛ 0.3͒, synthesized by a conventional solid state route. All the samples have the cubic spinel structure with Fd3m space group. Bi-substitution in Co 2 MnO 4 stabilizes the ferroelectric transition at a temperature of ϳ350 K and enhances the dielectric constant with a relaxor behavior. The capacitance-voltage ͑C-V͒ measurements confirm the ferroelectric nature at room temperature. Ferrimagnetic nature of the Co 2 MnO 4 is preserved in the Bi-substituted samples. Magnetocapacitive coupling proves candidature of these materials from an application point of view. © 2008 American Institute of Physics. ͓DOI: 10.1063/1.2894518͔In multiferroic materials, magnetism and ferroelectricity ͑FE͒ coexist. These materials have attracted considerable attention in recent years. [1][2][3][4][5][6][7] The simultaneous occurrence of ferromagnetism/ferrimagnetism ͑FM͒ and FE and the coupling between these two order parameters could lead to the emergence of new storage media, which enable electrically reading/writing of the magnetic memories and vice versa, yielding more degrees of freedom from device application point of view. Multiferroics with coupled electrical and magnetic properties are termed as magnetoelectric multiferroics. However, there are only very few multiferroic materials with a sufficient amount of magnetoelectric coupling because of the contrasting origins of these properties. Among recently established magnetoelectric multiferroic materials, 8 frustrated magnets and geometrical frustration of lattice degrees of freedom have been found to be the leading mechanisms for perovskite manganites and cubic spinel systems, respectively. In this context, for FE and FM to coexist in single phase, the atom which moves off the center to induce the electric dipole moment should be different from those that carry the magnetic moment ͑atoms with partially filled d orbitals, responsible for FM͒. Recent ab initio calculations for existing ferroelectrics suggest that atoms with d 0 configuration create more off center distortion. 2,4 In principle, coexistence of FE and FM can be achieved through either an alternative mechanism like a non-d electron for magnetism or through an alternative mechanism for FE. In practice, alternative mechanisms for FE are pursued. 7 One such alternative followed is the induction of nonmagnetic ions having stereochemically active lone pair of electrons that may introduce off centering in the structure containing transition metal ions. 9 Also, spin-phonon coupling that may lead to dielectric anomalies has been envisaged for geometrically frustrated ZnCr 2 O 4 spinel. 10 Multiferroicity in conventional spinel oxides has been predicted 11 and studied. However, the strength of magnetoelectric coupling was found to be weak. 12 One can think of a way to engineer a new class of materials, combining the mechanisms discussed in previous paragraph to achieve multiferroicity in spinel materials. Inc...

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“…In the distorted R3c structure, the cations are displaced from centrosymmetric position along the hexagonal [001] axis and this allows spontaneous polarization oriented along the same hexagonal axis as reported by Khomchenko et al. 15 From XRD patterns, no impurity was detected in BCFO or BLFO samples where as a small impurity (Bi 2 Fe 4 O 9 ) is found to be present in BBFO, BSFO samples (Figure 1(a)). However, the non-magnetic nature of this impurity will not affect the magnetic properties of the samples.…”

Section: Resultsmentioning

confidence: 49%

Crystal structure and magnetic properties of Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics using neutron diffraction and Mossbauer spectroscopy

et al. 2014

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Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics were studied using x-ray, neutron diffraction and magnetization techniques. All the samples crystallized in rhombohedral structure with space group R3c. The compounds exhibit antiferromagnetic (AFM) ordering at 300 K and no evidence of further structural or magnetic transition was observed on lowering of temperature below it. The magnetic structure of these substituted compounds are found to be collinear G-type AFM structure as against the non collinear incommensurate magnetic structure reported in the case of parent compound. The moments on Fe at 6 K are aligned along the a-axis in the case of Ca-doped sample. With increase in the ionic radii of dopant, the moments are found to be aligned in the ac plane and the angle of tilt away from the a-axis increases. The observed change in the magnetic structure with substitution is attributed to the intrinsic structural distortion as evidenced by the change in the bond angle (Fe-O-Fe) and bond distances (Bi-O, Fe-O). It has been found that heterovalent substitution A2+ results in the formation of oxygen vacancies in the parent lattices as the possibility of Fe4+ ruled out by Mössbauer spectra recorded at room temperature. Higher value of remnant magnetization (0.4187 emu/g) and coercivity (4.7554kOe) is observed in Bi0.8Ba0.2FeO3 sample in comparison to other substituted samples revealing a strong correlation between ionic radii and magnetization.

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Synthesis and multiferroic properties of Bi0.8A0.2FeO3 (A=Ca,Sr,Pb) ceramics

Cited by 177 publications

References 16 publications

Synthesis of nano-structured Bi1−xBaxFeO3 ceramics with enhanced magnetic and electrical properties

Synthesis of nano-structured Bi1−xBaxFeO3 ceramics with enhanced magnetic and electrical properties

Magnetoelectric properties of BixCo2−xMnO4 (⩽x⩽0.3)

Crystal structure and magnetic properties of Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics using neutron diffraction and Mossbauer spectroscopy

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