Compositional dependence of hyperfine interactions and magnetoelectric coupling in (BiFeO3)x-(BaTiO3)1–x solid solutions

Abstract In this work the compositional dependence of hyperfine interactions and magnetoelectric coupling in (BiFeO3)x-(BaTiO3)1-x solid solutions where x = 0.5-0.9 fabricated from commercial BaTiO3 in terms of the solid-state sintering method at various temperatures and over different time periods is described. In general, as the content of BaTiO3 increases, a decrease in the hyperfine magnetic field (Bhf) at 57Fe nuclei was observed. However, for samples exhibiting lower homogeneity in which the ions of Bi3+ and Fe3+ are replaced by Ba2+ and Ti4+ with lower probability, higher values of Bhf are obtained. For the sample where x = 0.6 that exhibits the coexistence of rhombohedral, regular and tetragonal phases, the highest value of the αME coefficient (3.57 mV/A) was observed, which is more than three times higher when compared to the hitherto published results.

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Structure and some magnetic properties of (BiFeO3)x-(BaTiO3)1−x solid solutions prepared by solid-state sintering

Nukleonika ◽

10.1515/nuka-2015-0018 ◽

2015 ◽

Vol 60 (1) ◽

pp. 81-85 ◽

Cited By ~ 4

Author(s):

Karol Kowal ◽

Maciej Kowalczyk ◽

Dionizy Czekaj ◽

Elżbieta Jartych

Keyword(s):

Magnetic Properties ◽

Solid State ◽

Solid Solutions ◽

Hyperfine Magnetic Field ◽

X Ray Diffraction ◽

Soaking Time ◽

Cubic Symmetry ◽

Solid State Sintering ◽

Perovskite Type ◽

Sintering Method

Abstract This paper presents the results of the study on structure and magnetic properties of the perovskite-type (BiFeO3)x-(BaTiO3)1−x solid solutions. The samples differing in the chemical composition (x = 0.9, 0.8, and 0.7) were produced according to the conventional solid-state sintering method from the mixture of powders. Moreover, three different variants of the fabrication process differing in the temperatures and soaking time were applied. The results of X-ray diffraction (XRD), Mössbauer spectroscopy (MS), and vibrating sample magnetometry (VSM) were collected and compared for the set of the investigated materials. The structural transformation from rhombohedral to cubic symmetry was observed for the samples with x = 0.7. With increasing of BaTiO3 concentration Mössbauer spectra become broadened reflecting various configurations of atoms around 57Fe probes. Moreover, gradual decreasing of the average hyperfine magnetic field and macroscopic magnetization were observed with x decreasing.

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Mechanically Driven Dissolution of Sn in Near-Equiatomic Bcc FeCo

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.194.187 ◽

2012 ◽

Vol 194 ◽

pp. 187-193 ◽

Cited By ~ 3

Author(s):

J.M. Loureiro ◽

Benilde F.O. Costa ◽

Gerard Le Caër ◽

Bernard Malaman

Keyword(s):

Magnetic Field ◽

Solid Solutions ◽

Room Temperature ◽

Hyperfine Magnetic Field ◽

Ternary Alloys ◽

119Sn Mössbauer Spectroscopy ◽

X Ray Diffraction ◽

Mechanically Alloyed ◽

Powder Mixtures ◽

X Ray

Ternary alloys, (Fe50−x/2Co50−x/2)Snx(x ≤ 33 at.%), are prepared by mechanical alloying from powder mixtures of the three elements. As-milled alloys are studied by X-ray diffraction and 57Fe and 119Sn Mössbauer spectroscopy. The solubility of Sn in near-equiatomic bcc FeCo is increased from ~0.5 at. % at equilibrium to ~20 at.% in the used milling conditions. The average 119Sn hyperfine magnetic field at room temperature is larger, for any x, than the corresponding fields in mechanically alloyed Fe-Sn solid solutions.

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Study of Magnetic Properties of Fe100-xNix Nanostructures Using the Mössbauer Spectroscopy Method

Nanomaterials ◽

10.3390/nano9050757 ◽

2019 ◽

Vol 9 (5) ◽

pp. 757 ◽

Cited By ~ 11

Author(s):

Kayrat K. Kadyrzhanov ◽

Vyacheslav S. Rusakov ◽

Maxim S. Fadeev ◽

Tatyana Yu. Kiseleva ◽

Artem L. Kozlovskiy ◽

...

Keyword(s):

Magnetic Field ◽

Mössbauer Spectroscopy ◽

Mossbauer Spectroscopy ◽

Hyperfine Interactions ◽

Hyperfine Magnetic Field ◽

Quadrupole Shift ◽

Average Value ◽

Mößbauer Spectroscopy ◽

Bcc Structure ◽

Fcc Structure

Hyperfine interactions of 57Fe nuclei in Fe100-xNix nanostructures synthesized in polymer ion-track membranes were studied by Mössbauer spectroscopy. The main part of obtained nanostructures was Fe100-xNix nanotubes with bcc structure for 0 ≤ x ≤ 40, and with fcc structure for 50 ≤ x ≤ 90. The length, outside diameter and wall thickness of nanotubes were 12 μm, 400 ± 10 nm and 120 ± 5 nm respectively. For the studied nanotubes a magnetic texture is observedalong their axis. The average value of the angle between the direction of the Fe atom magnetic moment and the nanotubes axis decreases with increasing of Ni concentration for nanotubes with bcc structure from ~50° to ~40°, and with fcc structure from ~55° to ~46°. The concentration dependences of the hyperfine parameters of nanotubes Mössbauer spectra are qualitatively consistent with the data for bulk polycrystalline samples. With Ni concentration increasing the average value of the hyperfine magnetic field increases from ~328 kOe to ~335 kOe for the bcc structure and drops to ~303 kOe in the transition to the fcc structure and then decreases to ~290 kOe at x = 90. Replacing the Fe atom with the Ni atom in the nearest environment of Fe atom within nanotubes with bcc structure lead to an increase in the hyperfine magnetic field by “6–9 kOe”, and in tubes with fcc structure—to a decrease in the hyperfine magnetic field by “11–16 kOe”. The changes of the quadrupole shift and hyperfine magnetic field are linearly correlated with the coefficient −(15 ± 5)·10−4 mm/s/kOe.

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Structure and hyperfine interactions in Bi1−xNdxFeO3 solid solutions prepared by solid-state sintering

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2014.04.011 ◽

2014 ◽

Vol 606 ◽

pp. 1-6 ◽

Cited By ~ 15

Author(s):

T. Pikula ◽

J. Dzik ◽

A. Lisinska-Czekaj ◽

D. Czekaj ◽

E. Jartych

Keyword(s):

Solid State ◽

Solid Solutions ◽

Hyperfine Interactions ◽

Solid State Sintering

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Separation of hyperfine interactions in Mössbauer spectrocsopy

Hyperfine Interactions ◽

10.1007/s10751-019-1658-8 ◽

2019 ◽

Vol 241 (1) ◽

Author(s):

Krzysztof R. Szymański

Keyword(s):

Magnetic Field ◽

Electric Field Gradient ◽

Isomer Shift ◽

Hyperfine Interactions ◽

Hyperfine Magnetic Field ◽

Hyperfine Fields ◽

Explicit Formulas ◽

Unpolarized Radiation ◽

Velocity Moments

AbstractProblem of determination of isomer shift, all components of the electric field gradient and hyperfine magnetic field in case of mixed hyperfine interactions is presented. Orientation of hyperfine fields in the absorber Cartesian frame can be determined by few measurements with use of unpolarized radiation under different directions of wave vector with respect to the absorber. The method can be applied for absorbers with well separated absorption lines in their spectra. Explicit formulas for tensor components of hyperfine interactions derived from velocity moments formalism are presented.

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Mean hyperfine fields at 57Fe in dilute iron-based alloys studied by Mössbauer spectroscopy

Nukleonika ◽

10.1515/nuka-2015-0010 ◽

2015 ◽

Vol 60 (1) ◽

pp. 39-42 ◽

Cited By ~ 1

Author(s):

Rafał Idczak ◽

Robert Konieczny ◽

Jan Chojcan

Keyword(s):

Magnetic Field ◽

Mössbauer Spectroscopy ◽

Solid Solutions ◽

Room Temperature ◽

Mossbauer Spectroscopy ◽

Hyperfine Magnetic Field ◽

Hyperfine Fields ◽

Mößbauer Spectroscopy ◽

The Mean ◽

Iron Based

Abstract The room temperature Mössbauer spectra of 57Fe were measured for numerous dilute iron-based alloys Fe1−xDx (D = Al, Co, Cr, Mn, Mo, Ni, Os, Pt, Re, Ru, Ta, Ti, V, W, Zn), annealed at 1270 K for 2 h before the measurements. The spectra were analyzed using the Hesse–Rübartsch method in order to determine the mean hyperfine magnetic field <B> at the 57Fe nuclei as a function of concentration x of the minority component of the alloy. As the binary alloys are one-faze solid solutions of an element D in iron, a linear relationship between <B> and x is observed. The result supports the suggestion that Mössbauer spectroscopy is a useful tool for the study of dissolution of different elements in iron.

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Mössbauer Spectroscopy and Magnetoelectric Effect Studies of Multiferroic Ceramics Based on BiFeO3

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.602-603.936 ◽

2014 ◽

Vol 602-603 ◽

pp. 936-941 ◽

Cited By ~ 1

Author(s):

Elzbieta Jartych ◽

Tomasz Pikula ◽

Karol Kowal ◽

Agata Lisińska-Czekaj ◽

Dionizy Czekaj

Keyword(s):

Magnetic Properties ◽

Solid Solutions ◽

Magnetoelectric Effect ◽

Hyperfine Interactions ◽

X Ray Diffraction ◽

Voltage Coefficient ◽

Properties Of Materials ◽

First Time ◽

The Relationship ◽

Sintering Method

In this work the results of investigations for (BiFeO3)x(BaTiO3)1-xand Bi1-xNdxFeO3solid solutions are described. Samples were prepared by the conventional solid-state sintering method. X-ray diffraction,57Fe Mössbauer spectroscopy, and magnetoelectric effect measurements were applied as complementary methods to determine the structure and magnetic properties of materials. For (BiFeO3)x(BaTiO3)1-xsolid solutions Mössbauer spectroscopy revealed the relationship between the content of BiFeO3and the magnetic properties of the samples. Moreover, the presence of magnetoelectric coupling in (BiFeO3)x(BaTiO3)1-xsolid solutions was registered at room temperature for the materials sintered at various temperatures. The maximum value of magnetoelectric voltage coefficient was achieved for 0.7(BiFeO3)0.3(BaTiO3) sintered at 1153K. Structure of Bi1-xNdxFeO3solid solutions was investigated in the whole range of concentration. Hyperfine interactions parameters were determined for the first time for these solid solutions.

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USING A DOUBLE CONVOLUTION OF LORENTZ AND GAUSS FUNCTIONS FOR PROCESSING THE MÖSSBAUER SPECTRA OF THE SUPERSATURATED DISORDERED SOLID SOLUTIONS

Journal of Applied Spectroscopy ◽

10.47612/0514-7506-2021-88-6-907-913 ◽

2021 ◽

Vol 88 (6) ◽

pp. 907-913

Author(s):

G. N. Konygin ◽

O. M. Nemtsova

Keyword(s):

Magnetic Field ◽

Solid Solutions ◽

Mössbauer Spectra ◽

Hyperfine Magnetic Field ◽

Tikhonov Regularization Method ◽

Gaussian Functions ◽

Mossbauer Spectra ◽

Supersaturated Solid Solutions ◽

Velocity Scale ◽

Mathematical Processing

An algorithm for mathematical processing of the Mössbauer spectra of supersaturated disordered solid solutions by the Tikhonov regularization method using a double convolution of the Lorentz function and two Gaussians is proposed. By the examples of spectra of supersaturated disordered solid solutions Fe100–xGex (x = 10—25 at.%) and Fe75Si15Al10, it is shown that the algorithm allows more correct processing, which provides a reliable distribution function of the hyperfine magnetic field. It is shown that to take into account the statistical ensemble of nonequivalent local atomic configurations of Fe atoms in disordered supersaturated solid solutions, it is necessary to use not only the convolution of two Gaussian functions, but also the projection scaling factor of the hyperfine magnetic field onto the velocity scale.

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The Synthesis of Ultrafine Ba/Sr Titanate Powders

MRS Proceedings ◽

10.1557/proc-249-101 ◽

1991 ◽

Vol 249 ◽

Author(s):

C.H. Lin ◽

T.S. Yan ◽

T.S. Chin

Keyword(s):

Aqueous Solution ◽

Particle Size ◽

Solid State ◽

Solid Solutions ◽

Sintering Temperature ◽

X Ray Diffraction ◽

Tem Analysis ◽

X Ray ◽

Solid State Sintering ◽

Sintering Method

ABSTRACTBa/Sr titanate powders were obtained by reacting TiO2.xH2O gel in Ba(OH)2 and/or Sr(OH)2 aqueous solution. Different reaction temperatures between 68°C and 98°C and different mole ratios of Ba(OH)2 and Sr(OH)2 were used.X-ray diffraction analysis showed that the titanate powders are cubic, and they are solid solutions of barium and strontium. The lattace spaces of the titanates are affected by the Ba(OH)g/ Sr(OH)g, mole ratio. TEM analysis showed that the titanate powders were spherical, ultrafine, and almost monodispersed. The particle size of the powders is about from 41 to 50 nm depending on the reaction temperature.The titanate powders were compacted and sintered at various temperatures. The best sintering temperature of the powders is about 150°C lower than that of powders made by solid state sintering method.

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Magnetoelectric effect in (BiFeO3)x–(BaTiO3)1-x solid solutions

Materials Science-Poland ◽

10.1515/msp-2015-0012 ◽

2015 ◽

Vol 33 (1) ◽

pp. 107-112 ◽

Cited By ~ 3

Author(s):

Karol Kowal ◽

Elżbieta Jartych ◽

Piotr Guzdek ◽

Agata Lisińska-Czekaj ◽

Dionizy Czekaj

Keyword(s):

Solid Solutions ◽

Magnetoelectric Effect ◽

Magnetic Ordering ◽

Magnetic Memory ◽

Chemical Compositions ◽

Soaking Time ◽

Voltage Coefficient ◽

Solid State Sintering ◽

Lock In ◽

Sintering Method

AbstractThe aim of the present work was to study magnetoelectric effect (ME) in (BiFeO3)x-(BaTiO3)1-x solid solutions in terms of technological conditions applied in the samples fabrication process. The rapidly growing interest in these materials is caused by their multiferroic behaviour, i.e. coexistence of both electric and magnetic ordering. It creates possibility for many innovative applications, e.g. in steering the magnetic memory by electric field and vice versa. The investigated samples of various chemical compositions (i.e. x = 0.7, 0.8 and 0.9) were prepared by the solid-state sintering method under three sets of technological conditions differing in the applied temperature and soaking time. Measurements of the magnetoelectric voltage coefficient αME were performed using a dynamic lock-in technique. The highest value of αME was observed for 0.7BiFeO3-0.3BaTiO3 solid solution sintered at the highest temperature (T = 1153 K) after initial electrical poling despite that the soaking time was reduced 10 times in this case.

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