Multiferroic and magneto-dielectric properties in Fe doped BaTiO3

Rajan, Soumya; Gazzali, P. M. Mohammed; Okrasa, Lidia; Chandrasekaran, G.

doi:10.1007/s10854-018-9208-8

Cited by 11 publications

(12 citation statements)

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“…The lattice parameters and thermal expansion behavior of the sample are changed by the applied magnetic field h. The response of spins toward the applied field distorts the lattice and thereby changing the DC ϵ 0 . The behavior shown in Figure 2 is in good qualitative agreement with the experimental data of Rajan et al [12] (see the inset in Figure 2) and Li et al [49] This comparison shows that our model is working and the observed results are correct. The value of the magnetodielectric coefficient in Fe-doped BTO increases continuously up to 9 kOe applied magnetic field.…”

Section: Numerical Results and Discussionsupporting

confidence: 88%

“…[53] It should be noted that because the size of the Er 3þ ion is almost intermediate between those of the Ba 3þ and Ti 4þ ions, it seems equally likely that Er ions occupy the site of either ions in the BTO lattice [54,55] (called amphoteric behavior) with higher preference for the Ba site. [53] We will now investigate the dielectric behavior of Ba 1-x Er x TiO 3 NPs using the following Hamiltonian x ¼ 0.005 with the experimental data of Rajan et al [12] J ErÀEr 1b ¼ 0.003 K, J ErÀEr 2b ¼ -0.127 K [56] , H me is from Equation 3.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

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Dielectric Properties in Transition Metal and Rare‐Earth‐Doped Multiferroic BaTiO₃ Nanoparticles

Apostolov

Apostolova

Wesselinowa

2020

Physica Status Solidi (b)

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The temperature, doping concentration, size, and magnetic field dependences of the real part of the dielectric function ϵ′ for Fe and Er ion‐doped BaTiO3bulk and nanoparticles—are calculated using microscopic models and the Green's function technique. The Fe ions substitute the Ti ions and cause a tensile strain. The maximum value of ϵ′ and the ferroelectric phase transition temperature TC decrease with increasing the Fe doping concentration. Moreover, ϵ′ decreases with decreasing particle size and increases with increasing an external magnetic field. The latter is an evidence for a strong magnetodielectric effect. By substituting the Ba with Er ions, there appears a strong compressive strain. It causes an increase in the maximum of ϵ′ and TC with increasing the Er ion concentration.

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Section: Numerical Results and Discussionsupporting

confidence: 88%

Section: Numerical Results and Discussionmentioning

confidence: 99%

Dielectric Properties in Transition Metal and Rare‐Earth‐Doped Multiferroic BaTiO₃ Nanoparticles

Apostolov

Apostolova

Wesselinowa

2020

Physica Status Solidi (b)

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“…Furthermore, using eqs. (2) and (3), 26 the fraction of the βor γ-phase was calculated: where the I α , I β, and I γ denote the peak intensity for α-, Table III shows the proportion of β-phase in E2-8 is dramatically enhanced to 87.2%, comparing with E0-8 (84.8%). Meanwhile, the proportion of γ-phase in E2-8 is sharply reduced from 15.2% of E0-8 to 12.8%.…”

Section: Ftir Analysismentioning

confidence: 99%

“…Traditional inorganic ferroelectric materials (BaTiO 3 , PZT, and so on) cannot meet the requirements of flexible devices due to size and impact limitations. 2,3 Therefore, polymer-based multiferroic materials emerged as a solution to solve the main problems associated with single-phase multiferroics (low magnetoelectric [ME] response at low temperatures) and inorganic ceramic-based (fragility, high dielectric losses, and complex processing procedures) ME materials. 4 It is expected to be an important coexistence multiferroic material for composite polymer dielectric material with magnetic material.…”

Section: Introductionmentioning

confidence: 99%

Improving ferroelectricity and ferromagnetism of PVDF‐CoFe₂O₄ thick films: Effect of Ethyl acetate and Temperature

Wang

Zhang

et al. 2019

J of Applied Polymer Sci

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PVDF‐CoFe2O4(CFO) thick membranes were synthesized by solvent casting method. The mixed organic solvents consist of N‐methyl‐2‐pyrrolidone (NMP) and Ethyl acetate (EA), in which the mass ratios of NMP and EA (NMP:EA = 1:0, 1:1, and 1:2) and the temperature of solvent evaporation (range from 50 to 80 °C) has been considered. The phase structure, β‐PVDF phase content, and electrical and magnetic properties of these membranes were investigated to reveal the effect of EA addition and temperature on these properties. Results manifest that all samples showed coexistence of ferroelectric and ferromagnetic properties at room temperature. EA addition makes film more compact, which may be responsible for the differences in ferromagnetic properties. Adding EA and enhancing temperature resulted in phase transition of PVDF from α and γ to β, which contributed to membranes’ ferroelectric performances. In all samples, NMP:EA = 1:2 treated at 80 °C exhibits the maximum β‐phase fraction and polarization (Pmax) of 87.2% and 2.398 μC cm−2, respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48345.

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“…Barium titanate (BTO) is a well-studied perovskite structure ferroelectric belonging to a class of materials known as "frustrated magnets" [9], in which the appearance of both ferroelectricity and magnetism is closely related to the structural distortion of the crystal lattice [10].The flexibility of the BTO structure allows for the accommodation of a large number of various dopants, including iron. Transition metal doping is a good way to induce magnetism in otherwise non-magnetic barium titanate, with the incorporation of dopants into the BTO lattice largely determined by the ionic radii of the participants in the process [11]. Albeit comprehensively investigated over the years, BTO-based ceramics persist to inspire novel research approaches [12,13] remaining at the forefront of materials science.…”

Section: Introductionmentioning

confidence: 99%

Evolution of structural and functional properties of the Fe/BaTiO3 system guided by mechanochemical and thermal treatment

et al. 2020

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Multiferroic systems are attractive to the researches worldwide due to diversity of existing applications, as well as possible novel ones. In order to contribute to understanding of the processes that take place within the structure of such a system, we subjected it to mechanochemical activation and thermal treatment. Powdery mixtures of iron and barium titanate in a mass ratio of 30% Fe and 70% BaTiO3 were activated in a planetary ball mill for time duration of 30 to 300 min and subsequently sintered at 1200?C in the atmosphere of air. During the activation the system undergoes structural phase transitions, whereby the content of iron and its oxides changes. The highest Fe content was observed in the sample activated for 270 min, with local maxima in crystallite size and microstrain values and a minimum in dislocation density. The complex dielectric permittivity changes in the applied radio frequency field, rangingfrom 176.9 pF/m in thesample activated for 90 min to 918.1 pF/m in the sample activated for 180 min. As the frequency of the field increases, an exponential decrease in the magnetic with a simultaneous increase in the electrical energy losses is noticeable. The system exhibits ferromagnetic resonance, whereby longer activation in the mill shifts the resonant frequency to higher values. Negative electrical resistance was observed in all analyzed samples. The activation time changes both the demagnetization temperature and the Curie temperature of the samples undergoing heating and cooling cycles in the external permanent magnetic field. Curie temperature is the highest in the sample activated for 240 min. Thermal treatment increases the initial magnetization of all samples, with the most pronounced increase of ~95% in the sample activated for 300 min. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. OI 172057]

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Multiferroic and magneto-dielectric properties in Fe doped BaTiO3

Cited by 11 publications

References 50 publications

Dielectric Properties in Transition Metal and Rare‐Earth‐Doped Multiferroic BaTiO₃ Nanoparticles

Dielectric Properties in Transition Metal and Rare‐Earth‐Doped Multiferroic BaTiO₃ Nanoparticles

Improving ferroelectricity and ferromagnetism of PVDF‐CoFe₂O₄ thick films: Effect of Ethyl acetate and Temperature

Evolution of structural and functional properties of the Fe/BaTiO3 system guided by mechanochemical and thermal treatment

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Multiferroic and magneto-dielectric properties in Fe doped BaTiO3

Cited by 11 publications

References 50 publications

Dielectric Properties in Transition Metal and Rare‐Earth‐Doped Multiferroic BaTiO3 Nanoparticles

Dielectric Properties in Transition Metal and Rare‐Earth‐Doped Multiferroic BaTiO3 Nanoparticles

Improving ferroelectricity and ferromagnetism of PVDF‐CoFe2O4 thick films: Effect of Ethyl acetate and Temperature

Evolution of structural and functional properties of the Fe/BaTiO3 system guided by mechanochemical and thermal treatment

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Product

Resources

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Dielectric Properties in Transition Metal and Rare‐Earth‐Doped Multiferroic BaTiO₃ Nanoparticles

Dielectric Properties in Transition Metal and Rare‐Earth‐Doped Multiferroic BaTiO₃ Nanoparticles

Improving ferroelectricity and ferromagnetism of PVDF‐CoFe₂O₄ thick films: Effect of Ethyl acetate and Temperature