Weak room temperature ferromagnetism and ferroelectric behavior in sonochemically synthesized bismuth and iron codoped SrTiO 3  nanoparticles

Dutta, Dimple P.; Tyagi, A. K.

doi:10.1016/j.matlet.2015.11.045

Cited by 13 publications

(3 citation statements)

References 19 publications

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“…Furthermore, a detailed study is carried out to verify the perovskite structural transformation of the SrTiO 3 by XRD, as shown in Figure 1h. The results show that the diffraction peaks are exactly same as the standard card (PDF#84‐0444) with Pm‐3m space group, [ 14 ] which can be clearly derived to the cubic perovskite phase. Notably, partial enlarged detail of the XRD spectrum (Figure 1i,j) displayed that the diffraction peaks of the samples after SC CO 2 treatment were shifted to the lower angle, indicating that the lattice spacings of SrTiO 3 were increased, corresponding to the results measured in the HRTEM image.…”

Section: Resultsmentioning

confidence: 64%

CO₂ Pressure‐Induced Self‐Trapped Excitons in SrTiO₃

Li,

Chen,

Gao

et al. 2024

Advanced Photonics Research

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With strong electron–phonon coupling, self‐trapped excitons (STEs) are typically formed in perovskite materials, and radiative recombination of STEs can produce broadband emission with large Stokes shifts. STEs are essential to further improve the optoelectronic properties of materials. Surprisingly, 2D system is the edge case, with low even no self‐trapping barriers, leading to effortless formation of STEs. In this work, 2D strontium titanate (SrTiO3) with defects is prepared using supercritical carbon dioxide (SC CO2) and its carrier transport and transition are studied. The appearance of wide photoinduced positive absorption signals in the femtosecond transient absorption spectra is direct evidence for the formation of STEs. The presence of STEs is further supported by the increased Stokes shift and full width at half maximum in the steady‐state photoluminescence spectra.

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Section: Resultsmentioning

confidence: 64%

CO₂ Pressure‐Induced Self‐Trapped Excitons in SrTiO₃

Li,

Chen,

Gao

et al. 2024

Advanced Photonics Research

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“…As expected, all the diffraction peaks of SrTiO 3 ( Figure a) suggest that SrTiO 3 has a cubic phase with Pm‐3m space group (PDF#84‐0444). [ 18 ] Noteworthy, partial enlarged detail of the (110), (200), (111), and (211) planes (Figure 2b–e) indicate that the diffraction peak of SrTiO 3 after SC CO 2 treatment shifted toward the lower angle, which is key evidence for the increased lattice spacing originated from stretching over the SC CO 2 treatment, as observed by TEM characterization. The increased proportion of the lattice spacings and lattice constants calculated from XRD at different pressures are listed in Table 1 and Table S1, Supporting Information, respectively, which indicates that different strains can be obtained upon variation of pressure.…”

Section: Resultsmentioning

confidence: 80%

Strong Ferromagnetic Manipulation of SrTiO₃ from CO₂‐Straining Effect on Electronic Structure Modulation

Gao

et al. 2023

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Abstract2D magnetic materials are ideal to fabricate magneto‐optical, magneto‐electric, and data storage devices, which are proposed to be critical to the next generation of information technologies. Benefited from their labile structures, 2D perovskites are amenable for magnetic manipulation through structural optimization. In this work, 2D room‐temperature ferromagnetic SrTiO3 is achieved through straining effect induced by supercritical carbon dioxide (SC CO2). According to experimental results, the cubic phase of SrTiO3 is converted to tetragonal with exposure of (110), (200), (111), and (211) planes over the SC CO2 treatment, leading to significant ferromagnetic enhancement. Theoretical calculations illustrate that over the conversion from cubic to tetragonal, the electronic structure of SrTiO3 is significantly modulated. Specifically, the spin density of planes of (200), (111), and (211) is enhanced, presumably due to the stabilization of the highest occupied molecular orbital over straining by SC CO2, leading to magnetic optimizations. This work suggests that magnetic optimization can be achieved from SC CO2‐induced electronic structure modulation.

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“…Recently, perovskite materials (ABO 3 ) have attracted much attention due to their wide application in the microelectronic and communication fields [1]. Barium titanate (BaTiO 3 , BTO) is one of the pristine ABO 3 compounds that has gained a lot of technology and commercial interest due to its intriguing optical, magnetic, and electrical properties [2].…”

Section: Introductionmentioning

confidence: 99%

Enhanced ferroelectric and ferromagnetic properties of xNiFe₂O₄/(1–x)Ba_0.94Ca_0.06Ti_0.975Zr_0.025O₃ nanocomposites

Linh¹,

Lam²,

Chinh³

et al. 2023

Adv. Nat. Sci: Nanosci. Nanotechnol.

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Bi-phase multiferroic composites of NiFe2O4/Ba0.94Ca0.06Ti0.975Zr0.025O3 (BCTZ/NFO) were successfully fabricated by high-energy ball milling combined with heat treatment. X-ray diffraction patterns and Raman spectra confirmed the successful coexistence of BCTZ and NFO phases in the final composites, which had an average particle size of 50 nm. However, the number of large particles increased with the increased NFO concentration in the composites. Optical properties of the composites were also modified by the NFO content, where the absorption band tended to the visible region and band-gap energies (E g) decreased with the increase of NFO. Ferromagnetic and ferroelectric properties of the BCTZ/NFO composites were also tuned by NFO additive content. Both saturation magnetisation (M s) and remnant magnetisation (M r) increased with the increase of NFO content, where the maximum values of M s = 22.52 emu g−1 and M r = 1.48 emu g−1 for composites with 40% NFO concentration, while coercivity (H c) was maintained at about 60 Oe. Maximum polarisation (P max), remnant polarisation (P r), and coercive field (E c) values all increased with NFO concentration, with 10% NFO providing the highest P max (= 0.249 μC cm−2) and P r (= 0.116 μC cm−2) values, and 30% NFO providing the highest E c (= 1.720 kV cm−1) value with a maximum applied voltage of 1 kV. Therefore, the multiferroic properties of BCTZ/NFO composites could be enhanced with an appropriate concentration of NFO, which led to a wide range of practical applications in the advanced electronic device field.

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Weak room temperature ferromagnetism and ferroelectric behavior in sonochemically synthesized bismuth and iron codoped SrTiO 3 nanoparticles

Cited by 13 publications

References 19 publications

CO₂ Pressure‐Induced Self‐Trapped Excitons in SrTiO₃

CO₂ Pressure‐Induced Self‐Trapped Excitons in SrTiO₃

Strong Ferromagnetic Manipulation of SrTiO₃ from CO₂‐Straining Effect on Electronic Structure Modulation

Enhanced ferroelectric and ferromagnetic properties of xNiFe₂O₄/(1–x)Ba_0.94Ca_0.06Ti_0.975Zr_0.025O₃ nanocomposites

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Weak room temperature ferromagnetism and ferroelectric behavior in sonochemically synthesized bismuth and iron codoped SrTiO 3 nanoparticles

Cited by 13 publications

References 19 publications

CO2 Pressure‐Induced Self‐Trapped Excitons in SrTiO3

CO2 Pressure‐Induced Self‐Trapped Excitons in SrTiO3

Strong Ferromagnetic Manipulation of SrTiO3 from CO2‐Straining Effect on Electronic Structure Modulation

Enhanced ferroelectric and ferromagnetic properties of xNiFe2O4/(1–x)Ba0.94Ca0.06Ti0.975Zr0.025O3 nanocomposites

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Product

Resources

About

CO₂ Pressure‐Induced Self‐Trapped Excitons in SrTiO₃

CO₂ Pressure‐Induced Self‐Trapped Excitons in SrTiO₃

Strong Ferromagnetic Manipulation of SrTiO₃ from CO₂‐Straining Effect on Electronic Structure Modulation

Enhanced ferroelectric and ferromagnetic properties of xNiFe₂O₄/(1–x)Ba_0.94Ca_0.06Ti_0.975Zr_0.025O₃ nanocomposites