Controlled dislocation density as enhancer of the magnetic response in multiferroic oxide nanoparticles

Volnistem, Eduardo Azzolini; Oliveira, Roger C.; Perin, Gabriel H.; Dias, G. S.; Melo, M.A.C. de; Cótica, Luis F.; Santos, I. A.; Süllow, S.; Baabe, Dirk; Litterst, F. J.

doi:10.1016/j.apmt.2022.101680

Cited by 5 publications

(2 citation statements)

References 67 publications

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“…8.65 × 10 –4 δ was determined to be the average dislocation density of the produced Fe-based particles. Due to a combination of nanoparticles and uncompensated spins along the dislocation lines, it is known that there is a relationship between magnetic properties, crystal size, and dislocation density . Also, small dislocation density values show a high degree of crystallization .…”

Section: Resultsmentioning

confidence: 99%

“…Due to a combination of nanoparticles and uncompensated spins along the dislocation lines, it is known that there is a relationship between magnetic properties, crystal size, and dislocation density. 39 Also, small dislocation density values show a high degree of crystallization. 40 The dislocation density was calculated in order to better understand the magnetic properties of the gels we produced and to show that the crystallization takes place at high values.…”

Section: Resultsmentioning

confidence: 99%

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Nd Recovery from Wastewater with Magnetic Calcium Alginate ((1,4)-β-d-Mannuronic Acid and α-L-Guluronic Acid) Hydrogels

et al. 2023

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In this study, a magnetic adsorbent material was produced, by environmentally friendly and inexpensive precursor materials, to clean wastewater that may result from primary and secondary rare earth metal (REM) production. Then, the absorption of Nd 3+ ions from wastewater was done and this process's kinetic and isotherm models were developed. Thus, the removal of Nd 3+ from wastewater with magnetic materials was accomplished, and then, this precious metal was recovered by using different acid media. First, Fe sub-micron particles were successfully produced by the polyol method. To increase the stability of Fe-based particles, their surfaces were covered with an oxide layer, and the average thickness was determined as 16 nm. The synthesized Fe particles were added into the calcium alginate beads and then coated with chitosan to increase the pH stability of the gels. The chemical composition of the gels was determined by Fourier transform infrared spectroscopy, the thermal properties were determined by differential scanning calorimetry, and the magnetic properties were determined by vibrating-sample magnetometer analysis. The magnetic saturation of the hydrogels was 0.297 emu/g. After the production of magnetic calcium alginate hydrogels, Nd 3+ ion removal from wastewater was done. Wastewater was cleaned with 94.22% efficiency. The kinetic models of the adsorption study were derived, and isotherm studies were done. Adsorption reaction fitted different kinetic models at different time intervals and the Freundlich isotherm model. The effect of pH, temperature, and solid−liquid ratio on the system was determined and the thermodynamic constants of the system were calculated. After the adsorption studies, Nd 3+ ions were regenerated in different acid environments and achieved an 87.48% efficiency value. The removal of Nd 3+ ions from wastewater was carried out with high efficiency, the gels obtained as a result of adsorption were regenerated with high efficiency by using acid media, and it was predicted that the gels could be reused. This study is thought to have reference results not only for the removal of REM from wastewater by magnetic adsorption materials but also for the adsorption of heavy metals from wastewater.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Nd Recovery from Wastewater with Magnetic Calcium Alginate ((1,4)-β-d-Mannuronic Acid and α-L-Guluronic Acid) Hydrogels

et al. 2023

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Dislocation Density‐Mediated Functionality in Single‐Crystal BaTiO₃

Zhuo,

Zhou,

Dietrich

et al. 2024

Advanced Science

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Unlike metals where dislocations carry strain singularity but no charge, dislocations in oxide ceramics are characterized by both a strain field and a local charge with a compensating charge envelope. Oxide ceramics with their deliberate engineering and manipulation are pivotal in numerous modern technologies such as semiconductors, superconductors, solar cells, and ferroics. Dislocations facilitate plastic deformation in metals and lead to a monotonous increase in the strength of metallic materials in accordance with the widely recognized Taylor hardening law. However, achieving the objective of tailoring the functionality of oxide ceramics by dislocation density still remains elusive. Here a strategy to imprint dislocations with {100}<100> slip systems and a tenfold change in dislocation density of BaTiO3 single crystals using high‐temperature uniaxial compression are reported. Through a dislocation density‐based approach, dielectric permittivity, converse piezoelectric coefficient, and alternating current conductivity are tailored, exhibiting a peak at medium dislocation density. Combined with phase‐field simulations and domain wall potential energy analyses, the dislocation‐density‐based design in bulk ferroelectrics is mechanistically rationalized. These findings may provide a new dimension for employing plastic strain engineering to tune the electrical properties of ferroics, potentially paving the way for advancing dislocation technology in functional ceramics.

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Electron density mapping using maximum entropy method and room temperature magnetism in Cr3+ substituted SnS2

Pavithra,

Robert

2024

J Mater Sci: Mater Electron

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Controlled dislocation density as enhancer of the magnetic response in multiferroic oxide nanoparticles

Cited by 5 publications

References 67 publications

Nd Recovery from Wastewater with Magnetic Calcium Alginate ((1,4)-β-d-Mannuronic Acid and α-L-Guluronic Acid) Hydrogels

Nd Recovery from Wastewater with Magnetic Calcium Alginate ((1,4)-β-d-Mannuronic Acid and α-L-Guluronic Acid) Hydrogels

Dislocation Density‐Mediated Functionality in Single‐Crystal BaTiO₃

Electron density mapping using maximum entropy method and room temperature magnetism in Cr3+ substituted SnS2

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Controlled dislocation density as enhancer of the magnetic response in multiferroic oxide nanoparticles

Cited by 5 publications

References 67 publications

Nd Recovery from Wastewater with Magnetic Calcium Alginate ((1,4)-β-d-Mannuronic Acid and α-L-Guluronic Acid) Hydrogels

Nd Recovery from Wastewater with Magnetic Calcium Alginate ((1,4)-β-d-Mannuronic Acid and α-L-Guluronic Acid) Hydrogels

Dislocation Density‐Mediated Functionality in Single‐Crystal BaTiO3

Electron density mapping using maximum entropy method and room temperature magnetism in Cr3+ substituted SnS2

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Product

Resources

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Dislocation Density‐Mediated Functionality in Single‐Crystal BaTiO₃