Ferromagnetism in Fe-doped BaTiO3 Ceramics

Deka, Bipul; Ravi, S.

doi:10.1007/s10948-017-4321-0

Cited by 17 publications

(9 citation statements)

References 27 publications

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“…Since oxygen vacancies are known to be present in this structure and the presence of Fe +3 ions along with Fe +4 ions are evidenced by PXRD, double exchange Fe +3 -O-Fe +4 interaction is also possible giving rise to FM. The increment in the ferromagnetic parameters with doping in the range of x = 0.05 to 0.15 is similar to the case of diluted magnetic semiconductors where bound magnetic polarons (BMP) are responsible for ferromagnetism [35]. We believe that the magnetism observed in our samples arises from superexchange, double exchange, and the formation of BMPs.…”

Section: Resultssupporting

confidence: 80%

“…(Fe +4 -O1-Fe +4 : θ ~ 85 o ) across two face-shared octahedra leading to weak ferromagnetic ordering (dependence of these on doping is shown in Figure S22). The origin of FM in Fedoped BaTiO3 is addressed by several authors [17,21,30,33,[35][36][37]61] where the possible mechanisms include superexchange, double exchange, RKKY interactions, cation ordering, lattice strain, and the formation of bound magnetic polarons. We rule out the RKKY interaction in our samples due to their insulating nature.…”

Section: Resultsmentioning

confidence: 99%

“…It was reported that the partial substitution of Ti +4 in BaFeO3-δ increases Fe +4 concentration and oxygen stoichiometry and hence, enhances the FM ordering [30]. These novel phenomena in BaMO3 have led to several studies on transition metal doped BaTiO3 materials but most of these are dedicated to explore structural phase transitions and magnetic properties [17,30,[32][33][34][35][36][37][38]. To the best of our knowledge, detailed study on the phonons of these systems and their roles in the physical properties is still lacking.…”

Section: Introductionmentioning

confidence: 99%

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Correlations between the structural, magnetic, and ferroelectric properties of BaMO3: M = Ti1-x(Mn/Fe)x compounds: A Raman study

Poojitha

Kumar

Rathore

et al. 2020

Journal of Alloys and Compounds

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Multiferroics possess two or more switchable states such as polarization, magnetization, etc.Phonon excitations in multiferroic phase are strongly modified by magnetoelectric coupling, spin-phonon coupling, and anharmonic phonon-phonon interactions. Here, we have investigated the correlation between phonons and multiferroic order parameters in hexagonal BaMO3: M = Ti1-x(Mn/Fe)x systems using powder x-ray diffraction (PXRD), Raman spectroscopic, and magnetic measurements. The structural transformation from a polar tetragonal to a non-polar 6H-type hexagonal phase is observed as a function of doping (Mn/Fe). Magnetic measurements reveal that the BaTi1-xMnxO3 is paramagnetic while BaTi1-xFexO3 exhibits composition-dependent ferromagnetic order. Importantly, Anomalous temperature-dependence is observed for two phonons (E1g at ~ 152 cm -1 and A1g at ~ 636 cm -1 ) in both the systems exhibiting similar trend with the doping (Mn/Fe) irrespective of the differences in their magnetic ground state. Hence, we attribute the phonon anomalies in both the (Fe/Mn doped) systems to strong anharmonic phonon-phonon interactions arising from large atomic displacements involved in the vibrations. In addition, we have also observed signatures of correlation of phonons with ferroelectric phase as well as magnetically ordered state suggesting the presence of a strain-induced magnetoelectric coupling in the doped compounds.

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Correlations between the structural, magnetic, and ferroelectric properties of BaMO3: M = Ti1-x(Mn/Fe)x compounds: A Raman study

Poojitha

Kumar

Rathore

et al. 2020

Journal of Alloys and Compounds

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“…As a result, the magnetic property is suppressed [14]. Nevertheless it is possible to induce ferromagnetic order in the BT system by doping with partially filled d transition metals [15][16][17]. This phenomenon has been predicted by spin-polarized density functional theory (DFT) calculations [18] and recently observed by experimental measurements in manganese-doped BaTiO3 ceramics [19][20][21].…”

Section: Introductionmentioning

confidence: 86%

Role of the rare-earth doping on the multiferroic properties of BaTiO3: First-principles calculation

Aslla-Quispe

Miwa

Guerra

2021

Physica B: Condensed Matter

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“…O sistema titanato de bário (BaTiO 3 ) é conhecido por ser um excelente material ferroelétrico, porém não apresenta propriedades ferromagnéticas. No entanto, é possível induzir propriedades ferromagnéticas no BaTiO 3 introduzindo metais de transição com orbitais d parcialmente preenchidos como dopantes na estrutura (GUO et al, 2012;DEKA et al, 2014;DEKA;RAVI, 2018). Neste trabalho, com a mesma finalidade, no lugar dos metais de transição usaremos elementos lantanídeos (terras-raras) com orbitais f parcialmente preenchidos.…”

Section: Introductionunclassified

Estudo teórico de sistemas ferroelétricos usando Teoria do Funcional de Densidade (DFT)

Aslla-Quispe¹

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In this work, the electronic properties of pure and modified barium titanate, with perovskite structure (ABO 3), considering trivalent rare-earth elements, which presente multifunctional characteristics with potential for practical applications. In particular, the multiferroic characteristics as well as electronic structure, have been studied as a function of the rare-earth content considering the Density Functional Theory (DFT), where the polarization of the electronic spin the the Hubbard potential have been taken into account in order to correct the electron-electron Coulumbians interactions in the partially-filled f orbitals of the rare-earth cations. The electronic properties, such as electronic structure and the states density have been calculated after the optimization of the system by using the minimization condition for the total energy. The band-structure were used in order to determine the spontaneous electric polarization, which is very important to confirm the ferroelectric nature of the crystalline systems. The total magnetization, obtained from the self-consistent calculations, is used for determining the ferromagnetic nature of the studied systems. Results show that the Ba 2+ substitution by La 3+ , considering the compensation of the crystalline structure with barium vacancies, induce the ferroelectric properties in the doped system, being those less intense that the pure tetragonal BaTiO 3. On the other hand, the Ba 2+ substitution by partially-filled 4f orbitals rare-earths, leads to the simultaneous presence of the dielectric, ferroelectric and ferromagnetic behavior, being the ferromagnetism promoted by the contribution of the 4f electrons of the rare-earth elements. This later property has been also confirmed from the result of the absorption coefficients (XANES) at the oxygen K-edge. The importance of the obtained results opens new perspectives for additional theoretical and experimental researches from the point of view of their designs and analysis of new materials, as well as revelas potential applications of the studied systems for the electro-electronic industry.

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Ferromagnetism in Fe-doped BaTiO3 Ceramics

Cited by 17 publications

References 27 publications

Correlations between the structural, magnetic, and ferroelectric properties of BaMO3: M = Ti1-x(Mn/Fe)x compounds: A Raman study

Correlations between the structural, magnetic, and ferroelectric properties of BaMO3: M = Ti1-x(Mn/Fe)x compounds: A Raman study

Role of the rare-earth doping on the multiferroic properties of BaTiO3: First-principles calculation

Estudo teórico de sistemas ferroelétricos usando Teoria do Funcional de Densidade (DFT)

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