Anisotropic growth of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si0011.gif" overflow="scroll"><mml:mi>α</mml:mi></mml:math>-Fe2O3 nanostructures

Jesus, J.R.; Lima, R. J. S.; Moura, K.O.; Duque, Juan G.; Meneses, C.T.

doi:10.1016/j.ceramint.2017.11.068

Cited by 20 publications

(2 citation statements)

References 38 publications

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“…First, in the absence of external magnetic field, we cool down the sample from 300 K (most particles show paramagnetic or superparamagnetic behavior) down to 5 K. In the second stage we apply a magnetic field of 100 Oe, while we increase the temperature from 5 K to 300 K in a stepwise manner. On the other hand, the FC magnetization curves are obtained by measuring the magnetization (M) while decreasing the temperature in the presence of a magnetic field [47]. The physical property we are interested in is the blocking temperature (T B ), that is, the temperature at which maximum magnetization is achieved.…”

Section: Resultsmentioning

confidence: 99%

Impact of Co2+ Substitution on Microstructure and Magnetic Properties of CoxZn1-xFe2O4 Nanoparticles

et al. 2019

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In the present work, we synthesized CoxZn1-xFe2O4 spinel ferrite nanoparticles (x= 0, 0.1, 0.2, 0.3 and 0.4) via the precipitation and hydrothermal-joint method. Structural parameters were cross-verified using X-ray powder diffraction (XRPD) and electron microscopy-based techniques. The magnetic parameters were determined by means of vibrating sample magnetometry. The as-synthesized CoxZn1-xFe2O4 nanoparticles exhibit high phase purity with a single-phase cubic spinel-type structure of Zn-ferrite. The microstructural parameters of the samples were estimated by XRD line profile analysis using the Williamson–Hall approach. The calculated grain sizes from XRPD analysis for the synthesized samples ranged from 8.3 to 11.4 nm. The electron microscopy analysis revealed that the constituents of all powder samples are spherical nanoparticles with proportions highly dependent on the Co doping ratio. The CoxZn1-xFe2O4 spinel ferrite system exhibits paramagnetic, superparamagnetic and weak ferromagnetic behavior at room temperature depending on the Co2+ doping ratio, while ferromagnetic ordering with a clear hysteresis loop is observed at low temperatures (5K). We concluded that replacing Zn2+ ions with Co2+ ions changes both the structural and magnetic properties of ZnFe2O4 nanoparticles.

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Section: Resultsmentioning

confidence: 99%

Impact of Co2+ Substitution on Microstructure and Magnetic Properties of CoxZn1-xFe2O4 Nanoparticles

et al. 2019

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“…Because of their adjustable surface morphology, distinctive crystal structure, and intrinsic catalytic properties, transition metal oxides have received a lot of technological and scientific attention [1]. Among these, hematite α-Fe 2 O 3 has recently been discovered as an important alternative and promising candidate for solar photocatalysis, which can degrade organic dyes with excellent photo-oxidation activity [2,3]. Iron oxide α-Fe 2 O 3 (Hematite), the most stable iron oxide with a rhombo-hexagonal structure, has received extensive research, especially in photocatalytic applications, due to its low-cost, non-toxicity, exceptional stability, excellent anti-ferromagnetic characteristics, simple recovery [4,5], and appropriate band gap energy Eg (2.0-2.3 eV).…”

Section: Introductionmentioning

confidence: 99%

Using egg ovalbumin to synthesize pure α-Fe2O3 and cobalt doped α-Fe2O3: structural, morphological, optical and photocatalytic properties

Hmamouchi

Yacoubi

Idrissi

2022

Heliyon

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Operando X‐ray Powder Diffraction Study of Mechanochemical Activation Tested for the CO Oxidation over Au@Fe₂O₃as Model Reaction

et al. 2022

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Mechanochemistry has proven to be an excellent green synthesis method for preparing organic, pharmaceutical, and inorganic materials. Mechanocatalysis, inducing a catalytic reaction by mechanical forces, is an emerging field because neither external temperature nor pressure inputs are required. Previous studies reported enhanced catalytic activity during the mechanical treatment of supported gold catalysts for CO oxidation. So far, the processes inside the milling vessel during mechanocatalysis could not be monitored. In this work, the results of high-energy operando X-ray powder diffraction experiments and online gas analysis will be reported. A specific milling setup with a custom-made vessel and gas dosing system was developed. To prove the feasibility of the experimental setup for operando diffraction studies during mechanocatalysis, the CO oxidation with Au@Fe 2 O 3 as a catalyst was selected as a well-known model reaction. The operando studies enabled monitoring morphology changes of the support as well as changes in the crystallite size of the gold catalyst. The change of the crystal size is directly correlated to changes in the active surface area and thus to the CO 2 yield. The studies confirm the successful implementation of the operando setup, and its potential to be applied to other catalytic reactions.

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Anisotropic growth of α-Fe2O3 nanostructures

Cited by 20 publications

References 38 publications

Impact of Co2+ Substitution on Microstructure and Magnetic Properties of CoxZn1-xFe2O4 Nanoparticles

Impact of Co2+ Substitution on Microstructure and Magnetic Properties of CoxZn1-xFe2O4 Nanoparticles

Using egg ovalbumin to synthesize pure α-Fe2O3 and cobalt doped α-Fe2O3: structural, morphological, optical and photocatalytic properties

Operando X‐ray Powder Diffraction Study of Mechanochemical Activation Tested for the CO Oxidation over Au@Fe₂O₃as Model Reaction

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Anisotropic growth of α-Fe2O3 nanostructures

Cited by 20 publications

References 38 publications

Impact of Co2+ Substitution on Microstructure and Magnetic Properties of CoxZn1-xFe2O4 Nanoparticles

Impact of Co2+ Substitution on Microstructure and Magnetic Properties of CoxZn1-xFe2O4 Nanoparticles

Using egg ovalbumin to synthesize pure α-Fe2O3 and cobalt doped α-Fe2O3: structural, morphological, optical and photocatalytic properties

Operando X‐ray Powder Diffraction Study of Mechanochemical Activation Tested for the CO Oxidation over Au@Fe2O3as Model Reaction

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Product

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Operando X‐ray Powder Diffraction Study of Mechanochemical Activation Tested for the CO Oxidation over Au@Fe₂O₃as Model Reaction