A Kinetic study of Tb3+ and Dy3+ co-substituted CoFe2O4 spinel ferrites using temperature dependent XRD, XPS and SQUID measurements

Ikram, Salma; Jacob, Jolly; Mahmood, K.; Mehboob, Khurram; Maheen, Mutaiba; Ali, Adnan; Amin, Nasir; Hussain, Sajad; Ashraf, Fouzia; Ilyas, Syed Zafar

doi:10.1016/j.ceramint.2020.03.143

Cited by 44 publications

(6 citation statements)

References 32 publications

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“…Finally, ammonium hydroxide was added to the mix in drops while the stirring continued until the pH reached approximately 7.0. 42,43 Aer removing the magnet, the mixture was heated to about 120 °C for three hours. A formed viscous gel has been self-ignited to give a ne and brown powder of the ferrite eventually.…”

Section: Synthesismentioning

confidence: 99%

Crystal structure and peculiarities of microwave parameters of Co_1−xNi_xFe₂O₄ nano spinel ferrites

Hussein,

Saafan,

Abosheiasha

et al. 2023

RSC Adv.

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Section: Synthesismentioning

confidence: 99%

Crystal structure and peculiarities of microwave parameters of Co_1−xNi_xFe₂O₄ nano spinel ferrites

Hussein,

Saafan,

Abosheiasha

et al. 2023

RSC Adv.

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“…XPS analysis was performed in order to illustrate the 0.5 PFAc surface behavior, where Figure 10 shows the Fe 2p signal. The spectra with the satellite peak position for the Fe 2p 3/2 in 719 eV, also exhibited peaks for Fe 3+ state in 727.1 and 714.2 eV assigned to ions on tetrahedral and octahedral sites respectively from Fe 2 O 3, while the peaks in 723.9 and 710.8 eV were ascribed to Fe 2+ ions from Fe 3 O 4 species [53,54] . It is noteworthy that at 708.6 eV, the peak identity was assigned to Fe 0 from the Fe atoms bonded in the Pt (111) layer (previously identified by XRD), which is indicative of the Pt−Fe alloying formation [20] .…”

Section: Resultsmentioning

confidence: 91%

Dry Reforming of Methane for Hydrogen Production Using Bimetallic Catalysts of Pt‐Fe Supported on γ‐Alumina

et al. 2021

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Biogas is a combustible composed mostly by methane (CH4) and carbon dioxide (CO2). Methane, the main component of biogas, is the responsible for the characteristics of the fuel itself. Greenhouse gases (GHG), including methane, along with global warming and depletion of fossil fuels have become issues of global concern. In the present work, Pt−Fe catalysts supported on γ‐Al2O3 varying the metal load were synthesized, characterized, and applied in the hydrogen production through dry reforming of methane. The synthesized catalysts were extensively characterized by analytical techniques such as X‐Ray diffraction (XRD), thermal gravimetric analysis coupled with differential thermal analysis (DTA/TGA), infrared spectroscopy with Fourier transform (FT‐IR), scanning electron microscopy (SEM), N2 physisorption, X‐ray photoelectron spectrometer (XPS) and high–resolution transmission electron microscopy (HR‐TEM). The results from the catalytic tests exhibited that methane conversion reached values up to 95 % for all studied catalysts. The maximum H2 selectivity was 68 % (973 K) and 55 % (1173 K), for the bimetallic catalysts 0.15 PFAc (0.5 % Pt‐0.15 % Fe wt/Al2O3) and 0.5 PFAc (0.5 % Pt–0.5 % Fe wt/Al2O3) respectively. XPS and HR‐TEM results confirmed the iron‐platinum phase (FePt). Catalyst characteristics such as specific surface area, average crystallite size and morphology showed to play a role in the methane reforming performance.

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“…The 2p 1/2 and 2p 3/2 states of cobalt are corroborated by the peaks at binding energies ≈792 and 777 eV, matching well with the reported zero‐valent cobalt. [ 14 ] Besides, the sharp peak corresponding to Co 2p 3/2 state is also a characteristic feature of pure‐phase cobalt. Next, XRD measurement was carried out to convincingly identify the crystal structure of cobalt nanosheets.…”

Section: Resultsmentioning

confidence: 99%

Van der Waals Epitaxy Growth of 2D Single‐Element Room‐Temperature Ferromagnet

et al. 2023

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2D single‐element materials, which are pure and intrinsically homogeneous on the nanometer scale, can cut the time‐consuming material‐optimization process and circumvent the impure phase, bringing about opportunities to explore new physics and applications. Herein, for the first time, the synthesis of ultrathin cobalt single‐crystalline nanosheets with a sub‐millimeter scale via van der Waals epitaxy is demonstrated. The thickness can be as low as ≈6 nm. Theoretical calculations reveal their intrinsic ferromagnetic nature and epitaxial mechanism: that is, the synergistic effect between van der Waals interactions and surface energy minimization dominates the growth process. Cobalt nanosheets exhibit ultrahigh blocking temperatures above 710 K and in‐plane magnetic anisotropy. Electrical transport measurements further reveal that cobalt nanosheets have significant magnetoresistance (MR) effect, and can realize a unique coexistence of positive MR and negative MR under different magnetic field configurations, which can be attributed to the competition and cooperation effect among ferromagnetic interaction, orbital scattering, and electronic correlation. These results provide a valuable case for synthesizing 2D elementary metal crystals with pure phase and room‐temperature ferromagnetism and pave the way for investigating new physics and related applications in spintronics.

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A Kinetic study of Tb3+ and Dy3+ co-substituted CoFe2O4 spinel ferrites using temperature dependent XRD, XPS and SQUID measurements

Cited by 44 publications

References 32 publications

Crystal structure and peculiarities of microwave parameters of Co_1−xNi_xFe₂O₄ nano spinel ferrites

Crystal structure and peculiarities of microwave parameters of Co_1−xNi_xFe₂O₄ nano spinel ferrites

Dry Reforming of Methane for Hydrogen Production Using Bimetallic Catalysts of Pt‐Fe Supported on γ‐Alumina

Van der Waals Epitaxy Growth of 2D Single‐Element Room‐Temperature Ferromagnet

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A Kinetic study of Tb3+ and Dy3+ co-substituted CoFe2O4 spinel ferrites using temperature dependent XRD, XPS and SQUID measurements

Cited by 44 publications

References 32 publications

Crystal structure and peculiarities of microwave parameters of Co1−xNixFe2O4 nano spinel ferrites

Crystal structure and peculiarities of microwave parameters of Co1−xNixFe2O4 nano spinel ferrites

Dry Reforming of Methane for Hydrogen Production Using Bimetallic Catalysts of Pt‐Fe Supported on γ‐Alumina

Van der Waals Epitaxy Growth of 2D Single‐Element Room‐Temperature Ferromagnet

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Crystal structure and peculiarities of microwave parameters of Co_1−xNi_xFe₂O₄ nano spinel ferrites

Crystal structure and peculiarities of microwave parameters of Co_1−xNi_xFe₂O₄ nano spinel ferrites