Structural, magnetic and ferroelectric properties of Pr doped multiferroics bismuth ferrites

Verma, Vivek; Beniwal, Anu; Ohlan, Anil; Tripathi, Rahul

doi:10.1016/j.jmmm.2015.06.067

Cited by 55 publications

(14 citation statements)

References 26 publications

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“…BiFeO 3 (BFO) has drawn considerable attention, since it has been found hitherto as the only single-phase room-temperature magnetoelectric multiferroic1234567. Meanwhile, tremendous activities have been engaged to study BFO thin films, which may meet the needs for microelectronic information storage devices89101112.…”

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confidence: 99%

Evolution of structural distortion in BiFeO3 thin films probed by second-harmonic generation

Wang

Jin

Guo

et al. 2016

Sci Rep

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BiFeO3 thin films have drawn much attention due to its potential applications for novel magnetoelectric devices and fundamental physics in magnetoelectric coupling. However, the structural evolution of BiFeO3 films with thickness remains controversial. Here we use an optical second-harmonic generation technique to explore the phase-related symmetry evolution of BiFeO3 thin films with the variation of thickness. The crystalline structures for 60 and 180-nm-thick BiFeO3 thin films were characterized by high-resolution X-ray diffractometry reciprocal space mapping and the local piezoelectric response for 60-nm-thick BiFeO3 thin films was characterized by piezoresponse force microscopy. The present results show that the symmetry of BiFeO3 thin films with a thickness below 60 nm belongs to the point group 4 mm. We conclude that the disappearance of fourfold rotational symmetry in SHG s-out pattern implies for the appearance of R-phase. The fact that the thinner the film is, the closer to 1 the tensor element ratio χ31/χ15 tends, indicates an increase of symmetry with the decrease of thickness for BiFeO3 thin films.

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confidence: 99%

Evolution of structural distortion in BiFeO3 thin films probed by second-harmonic generation

Wang

Jin

Guo

et al. 2016

Sci Rep

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“…It is also found that the particle/grain size gradually decreases from ~200 to 50 nm with increasing the Mn doping. This may be due the suppression of the oxygen vacancies by Mn doping which prevent the grain growth as already reported in case Cr and Pr doped BFO thin films . Hence, it improves the density of the BFO nanomaterials.…”

Section: Resultsmentioning

confidence: 52%

“…However, the increase of Mn‐dopant prevents the Fe 2+ ions to be in the Fe 3+ ions and it resulted in the suppression of the oxygen vacancies. Finally, the suppression of the oxygen vacancies enhances the value of dielectric constant …”

Section: Resultsmentioning

confidence: 99%

Structural, dielectric and magnetic domains properties of Mn‐doped BiFeO₃ materials

Awasthi

Asokan

Das

2020

Int J Applied Ceramic Tech

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The pure and Mn-doped BiFe 1−x Mn x O 3 (x = 0.00, 0.02, 0.05, 0.10) nanomaterials have been prepared by coprecipitation method. The powder X-ray diffraction pattern analysis shows a structural phase transformation from rhombohedral to orthorhombic, as Mn content in the doped BiFe 1−x Mn x O 3 increases from x = 0.00 to 0.10. The Raman spectrum analysis of BiFe 1−x Mn x O 3 also confirms structural phase transformation. The average crystallite size was calculated using the Scherrer formula and found to decrease from 100 to 60 nm. The surface structure of interconnecting cubic grain turns into spherical grains via petal-shaped grains with increasing the Mn-doping concentration. The value of dielectric constant at the frequency of 1 MHz increases rapidly from 27.2 to 76.8 whereas the tangent loss (tan δ) increases gradually from 0.26 to 0.55 as the Mn-doping concentration increases from x = 0.00 to 0.10. It reveals the enhancement of ferroelectric behavior and suppression of the leakage current density. The drastic change in the phase image contrast of magnetic force micrographs with increasing Mn-doping concentration in BiFe 1−x Mn x O 3 also indicates the improvement of the ferromagnetism. K E Y W O R D S multiferroic, Raman spectroscopy, surface modifications, X-ray methods

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“…The loss peak is provided mainly by screen charges, and the corresponding anomaly of free relaxation time appears near 290°C. This might be because the ceramics sintered for 2 h display the smallest grain size, which can have more grain boundaries and thus the most screen charges will occurred [38,39]. The dielectric peak has never been observed in previous reports, including La, Sm and Ti doped BFO samples.…”

Section: Resultsmentioning

confidence: 79%

Dielectric, ferroelectric and magnetic properties of Bi0.78La0.08Sm0.14Fe0.85Ti0.15O3 ceramics prepared at different sintering conditions

Li¹,

Wang²,

Gao³

et al. 2018

PAC

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Although BiFeO 3 (BFO) has attracted great attention due to its special physical properties as a typical single phase multiferroic material, the application is limited due to the formation of impurities, defects and so forth. Herein, we report improved multiferroic properties of Bi 0.78 La 0.08 Sm 0.14 Fe 0.85 Ti 0.15 O 3 (BLSFTO) ceramics by combination of co-doping and sintering schedule. BLSFTO multiferroic ceramics were prepared by using the conventional solid state reaction method and the effect of sintering time (2, 5, 10, 20 and 30 h) on the structural, dielectric and multiferroic properties was investigated systematically. The result indicates that stable BLSFTO phase with perovskite structure was formed for all the samples. Only some impurities such as Bi 2 O 4 can be observed when the sintering time is longer than 20 h, indicating that the sintering time can induce structural changes in BLSFTO and too long sintering time can remarkably increase the secondary phases. In addition, the frequency dependent dielectric properties show that sintering time has distinct effect on the frequency stability and the relaxation process. The result demonstrates that the enhanced magnetization, improved dielectric and ferroelectric properties may be correlated with the structural transformation, impurities, oxygen vacancies and grain morphology.

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Structural, magnetic and ferroelectric properties of Pr doped multiferroics bismuth ferrites

Cited by 55 publications

References 26 publications

Evolution of structural distortion in BiFeO3 thin films probed by second-harmonic generation

Evolution of structural distortion in BiFeO3 thin films probed by second-harmonic generation

Structural, dielectric and magnetic domains properties of Mn‐doped BiFeO₃ materials

Dielectric, ferroelectric and magnetic properties of Bi0.78La0.08Sm0.14Fe0.85Ti0.15O3 ceramics prepared at different sintering conditions

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Structural, magnetic and ferroelectric properties of Pr doped multiferroics bismuth ferrites

Cited by 55 publications

References 26 publications

Evolution of structural distortion in BiFeO3 thin films probed by second-harmonic generation

Evolution of structural distortion in BiFeO3 thin films probed by second-harmonic generation

Structural, dielectric and magnetic domains properties of Mn‐doped BiFeO3 materials

Dielectric, ferroelectric and magnetic properties of Bi0.78La0.08Sm0.14Fe0.85Ti0.15O3 ceramics prepared at different sintering conditions

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Structural, dielectric and magnetic domains properties of Mn‐doped BiFeO₃ materials