The impact of antisite disorder on the physical properties of La2FeB"O6 (Bʺ = Fe, Ni and Co) double perovskites

Ateia, Ebtesam E.; Mohamed, Amira T.; Elshimy, Hassan

doi:10.1007/s13204-020-01356-4

Cited by 14 publications

(4 citation statements)

References 42 publications

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“…Spinel CoCuFe 4 O 8 was synthesized using the modified citrate auto combustion technique [28][29][30]. The metal nitrates Fe (NO 3 ) 3 .9H 2 O, Co (NO 3 ) 2 .6H 2 O, Cu (NO 3 ) 2 .6H 2 O and citric acid were used as starting materials.…”

Section: Methodsmentioning

confidence: 99%

Crystal structures and magnetic properties of polyethylene glycol/polyacrylamide encapsulated CoCuFe4O8 ferrite nanoparticles

et al. 2020

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Polymer-inorganic nanocomposites with systematized structure provide a novel composite material having complementary between the polymer and inorganic materials. A new CoCuFe 4 O 8 spinel ferrite was prepared by a modified citrate auto combustion technique. The formation of the core-shell structure by coating CoCuFe 4 O 8 nanoparticles (NPs) with Polyethylene glycol (PEG) or Polyacrylamide (PAM) was successfully proceeding. The X-ray diffraction analysis shows that the prepared sample crystallizes in a cubic crystal structure with the Fd3m space group. The structural changes are elucidated via diametrical size, lattice parameter, dislocation density and strain. The obtained data reveals that after coating with PEG/ PAM the crystallite size of CoCuFe 4 O 8 spinel ferrite nanoparticles decreases while, the dislocation density increases. The dislocation density provides more energy-friendly locations for nucleation, consequently, the crystallinity deteriorates and the crystal grains become finer. High-Resolution Transmission Electron Microscopy (HRTEM) images ratify that the spinel nanoparticles are embedded in the PEG/PAM matrix forming the core-shell structure. The measurements of the magnetic hysteresis loops assure that all prepared samples exhibit a hard ferrite nature with a coercivity ranging from 1525 to 1512 Oe. The decrease of the magnetic parameters of CoCuFe 4 O 8 /PEG-PAM can be explained on the basis of the contribution of the non-magnetic coating layer to the total magnetization. The total magnetic behavior of the nanocomposites can be tuned and tailored depending on the coating layers. Based on the obtained data, the formulated CoCuFe 4 O 8 decorated with PEG-PAM can be recognized as a promising functional material for applications in biomedicine. The enhanced magnetic properties make CoCuFe 4 O 8 /PEG-PAM a fitting candidate in the high-density recording.

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Section: Methodsmentioning

confidence: 99%

Crystal structures and magnetic properties of polyethylene glycol/polyacrylamide encapsulated CoCuFe4O8 ferrite nanoparticles

et al. 2020

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“…As starting ingredients, stoichiometric concentrations of high purity (99.9%, Fisher chemicals) nitrates of iron, cobalt, gadolinium, erbium, and citric acid were utilized. Further details about the preparation method can be found in previous works [25][26][27].…”

Section: Synthesis Of Cgefo Npsmentioning

confidence: 99%

Designing bi-functional Ag-CoGd_0.025Er_0.05Fe_1.925O₄ nanoarchitecture via green method

Ateia,

Elraaie,

Mohamed

2024

J. Phys. D: Appl. Phys.

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In the current study, we developed a simple and biocompatible method for producing core-shell nanoparticles (NPs). Citrate auto combustion and green procedures were used to create core-shell Ag/CoGd0.025Er0.05Fe1.925O4 (Ag/CGEFO) sample with an average crystallite size of 26.84 nm. The prepared samples were characterized via different structural techniques, such as X-ray diffraction (XRD), Raman Spectroscopy (RS), High Resolution Transmission Electron Microscopy (HRTEM), and Energy Dispersive X-ray analysis (EDX). These analyses were utilized to characterize and confirm the successful formation of the core-shell architecture. For core–shell NPs, all peaks of Ag and CoGd0.025Er0.05Fe1.925O4 ferrite are detected in the XRD, confirming the co-presence of the ferrite spinel phase and the cubic Ag phase. The magnetic hysteresis curves demonstrate typical hard ferri-magnetic behavior along with maximum magnetic saturation values up to 53.74 emu g−1 for the CGEFO sample, while an enhanced coercivity is detected for the coated sample. Moreover, the width of the hysteresis loop is increased for the Ag/CGEFO sample compared to the uncoated one. This indicates that the addition of Ag as a shell increases magneto crystalline anisotropy (MCA). Moreover, the Eg of uncoated CGEFO is equal to 1.4 eV, increasing to 3.6 eV for coated ones. This implies the influence of CGEFO is diminished when the surface is coated with Ag (shell), and the reflectance of the Ag/CGEFO core-shell is nearly dependent on the reflectance of the Ag shell layer. Consequently, the Ag/CGEFO can be used as a light shielding substance.

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“…However, a controlled modification of disorder can be used as tuning control parameter to investigate emergent quantum phenomena that go beyond the scope of decoherence and localization of fermions inducing Anderson-localized states [2]. This is the case, for instance, of antisite disorder in double pervoskites and low-dimensional oxides compounds, where exotic magnetic and electronic states emerge [3,4]. Last but not least, the investigation of the influence of antisite disorder on the correlation between electron and spin degrees of freedom is timely to establish alternative routes to uncover new quantum states of matter from a perspective of non-canonical quantum phase diagrams.…”

Section: Introductionmentioning

confidence: 99%

Investigation of role of antisite disorder in pristine cage compound FeGa$_3$

Kaufmann Ribeiro,

Mello,

Martelli

et al. 2023

SciPost Phys. Proc.

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The role of controlled Fe antisite disorder in the narrow gap semiconductor FeGa_33 has been investigated. Polycrystalline samples were synthesized by the combination of arc-melting furnace and successive annealing processes. Deviations from occupation numbers of Fe and Ga sites expected in the pristine compound were obtained from X-ray data using Rietveld refinement analysis. Besides that, electrical transport and magnetization measurements reveal that hierarchy in Fe and Ga site disorder tunes the ground state of FeGa_33 from paramagnetic semiconductor to a magnetic metal. These findings are discussed inside the framework of Anderson localization in the vicinity of metal-semiconductor transitions and spin fluctuations.

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The impact of antisite disorder on the physical properties of La2FeB"O6 (Bʺ = Fe, Ni and Co) double perovskites

Cited by 14 publications

References 42 publications

Crystal structures and magnetic properties of polyethylene glycol/polyacrylamide encapsulated CoCuFe4O8 ferrite nanoparticles

Crystal structures and magnetic properties of polyethylene glycol/polyacrylamide encapsulated CoCuFe4O8 ferrite nanoparticles

Designing bi-functional Ag-CoGd_0.025Er_0.05Fe_1.925O₄ nanoarchitecture via green method

Investigation of role of antisite disorder in pristine cage compound FeGa$_3$

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The impact of antisite disorder on the physical properties of La2FeB"O6 (Bʺ = Fe, Ni and Co) double perovskites

Cited by 14 publications

References 42 publications

Crystal structures and magnetic properties of polyethylene glycol/polyacrylamide encapsulated CoCuFe4O8 ferrite nanoparticles

Crystal structures and magnetic properties of polyethylene glycol/polyacrylamide encapsulated CoCuFe4O8 ferrite nanoparticles

Designing bi-functional Ag-CoGd0.025Er0.05Fe1.925O4 nanoarchitecture via green method

Investigation of role of antisite disorder in pristine cage compound FeGa$_3$

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Designing bi-functional Ag-CoGd_0.025Er_0.05Fe_1.925O₄ nanoarchitecture via green method