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

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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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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Structure analysis of CaTi1−xSnxO3 (x = 0.0–1.0) solid solutions

Powder Diffraction ◽

10.1017/s0885715614000074 ◽

2014 ◽

Vol 29 (3) ◽

pp. 254-259 ◽

Cited By ~ 3

Author(s):

Naoki Takani ◽

Hisanori Yamane

Keyword(s):

Solid State ◽

Solid Solutions ◽

Solid State Reaction ◽

X Ray Diffraction ◽

Unit Cell Parameters ◽

X Ray ◽

Cell Parameters ◽

Diffraction Patterns ◽

Perovskite Type ◽

Perovskite Type Structure

CaTi1−xSnxO3 (x = 0.0–1.0) solid solutions were prepared by solid-state reaction at 1450 °C. Rietveld refinement of their powder X-ray diffraction patterns revealed that all the solid solutions crystallized in orthorhombic cells with the perovskite-type structure, the space group Pbnm. The refined unit-cell parameters linearly increased with nominal tin contents x.

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

Nukleonika ◽

10.1515/nuka-2017-0016 ◽

2017 ◽

Vol 62 (2) ◽

pp. 117-122 ◽

Cited By ~ 4

Author(s):

Karol Kowal ◽

Piotr Guzdek ◽

Maciej Kowalczyk ◽

Elżbieta Jartych

Keyword(s):

Magnetic Field ◽

Solid Solutions ◽

Hyperfine Interactions ◽

Hyperfine Magnetic Field ◽

Magnetoelectric Coupling ◽

Lower Probability ◽

Compositional Dependence ◽

Solid State Sintering ◽

Time Periods ◽

Sintering Method

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 Magnetic Properties of Bi5Ti3FeO15 Ceramics Prepared by Sintering, Mechanical Activation and Edamm Process. A Comparative Study

Archives of Metallurgy and Materials ◽

10.1515/amm-2016-0147 ◽

2016 ◽

Vol 61 (2) ◽

pp. 869-874 ◽

Cited By ~ 5

Author(s):

E. Jartych ◽

T. Pikula ◽

M. Mazurek ◽

W. Franus ◽

A. Lisinska-Czekaj ◽

...

Keyword(s):

Magnetic Properties ◽

Mössbauer Spectroscopy ◽

Solid State ◽

Thermal Treatment ◽

Mechanical Activation ◽

Mechanical Milling ◽

Mossbauer Spectroscopy ◽

Subsequent Thermal Treatment ◽

Solid State Sintering ◽

Sintering Method

Abstract Three different methods were used to obtain Bi5Ti3FeO15 ceramics, i.e. solid-state sintering, mechanical activation (MA) with subsequent thermal treatment, and electrical discharge assisted mechanical milling (EDAMM). The structure and magnetic properties of produced Bi5Ti3FeO15 samples were characterized using X-ray diffraction and Mössbauer spectroscopy. The purest Bi5Ti3FeO15 ceramics was obtained by standard solid-state sintering method. Mechanical milling methods are attractive because the Bi5Ti3FeO15 compound may be formed at lower temperature or without subsequent thermal treatment. In the case of EDAMM process also the time of processing is significantly shorter in comparison with solid-state sintering method. As revealed by Mössbauer spectroscopy, at room temperature the Bi5Ti3FeO15 ceramics produced by various methods is in paramagnetic state.

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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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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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Effect of BaTiO3 concentration on structural and magnetic properties of mechanically activated BiFeO3-BaTiO3 system

Nukleonika ◽

10.1515/nuka-2017-0022 ◽

2017 ◽

Vol 62 (2) ◽

pp. 149-152 ◽

Cited By ~ 3

Author(s):

Bożena Malesa ◽

Tomasz Pikula ◽

Dariusz Oleszak ◽

Elżbieta Jartych

Keyword(s):

Magnetic Properties ◽

Solid State ◽

Barium Titanate ◽

Thermal Treatment ◽

Solid Solutions ◽

X Ray Diffraction ◽

X Ray ◽

Additional Thermal Treatment ◽

Properties Of Materials ◽

Structural And Magnetic Properties

Abstract In this research, the mechanical activation method is proposed as an alternative process of preparation of the (BiFeO3)1-x-(BaTiO3)x solid solutions with various concentrations of barium titanate (x = 0.1÷0.9). However, mechanical milling itself does not allow obtaining the desired products and additional thermal treatment is needed to complete the solid-state reaction. In the present studies, X-ray diffraction and 57Fe Mössbauer spectroscopy were applied as complementary methods in order to study the structural and magnetic properties of materials. The investigations revealed that an increase of BaTiO3 concentration causes changes in the crystalline and hyperfine magnetic structure of the studied (BiFeO3)1-x-(BaTiO3)x system.

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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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