Preparation and characterization of spinel-type MeFe2O4 (Me = Cu, Cd, Ni and Zn) for catalyst applications

Rezlescu, N.; Rezlescu, E.; Popa, P.D.; Popovici, Eveline; Doroftei, C.; Ignat, Maria

doi:10.1016/j.matchemphys.2012.11.005

Cited by 60 publications

(18 citation statements)

References 22 publications

(13 reference statements)

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“…1 Ni and Mn hydroxides also decompose to form metal oxide in the autoclaves, and the metal oxide amount is not completely consumed during the crystallization of spinel structure. 10 The XRD patterns also show a slight shifting of XRD peak with increasing hydrothermal time in all ferrite samples, especially for CoFe 2 O 4 and NiFe 2 O 4 , which implies that the variation of the reaction time leads to the cation redistribution at tetrahedral A and octahedral B sites. Based on the Scherrer's formula D ¼ Kk/(bcosh), the average crystalline size of ferrite nanocrystals is calculated, where K is 0.9, k is 1.54060 Å , b is full width at half maximum of diffraction peak, and h is the diffraction angle.…”

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confidence: 82%

Microstructure and magnetic properties of MFe2O4 (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method

Wang

Ding

Zhao

et al. 2015

Journal of Applied Physics

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Three kinds of spinel ferrite nanocrystals, MFe2O4 (M = Co, Ni, and Mn), are synthesized using colloid mill and hydrothermal method. During the synthesis process, a rapid mixing and reduction of cations with sodium borohydride (NaBH4) take place in a colloid mill then through a hydrothermal reaction, a slow oxidation and structural transformation of the spinel ferrite nanocrystals occur. The phase purity and crystal lattice parameters are estimated by X-ray diffraction studies. Scanning electron microscopy and transmission electron microscopy images show the morphology and particle size of the as-synthesized ferrite nanocrystals. Raman spectrum reveals active phonon modes at room temperature, and a shifting of the modes implies cation redistribution in the tetrahedral and octahedral sites. Magnetic measurements show that all the obtained samples exhibit higher saturation magnetization (Ms). Meanwhile, experiments demonstrate that the hydrothermal reaction time has significant effects on microstructure, morphologies, and magnetic properties of the as-synthesized ferrite nanocrystals.

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confidence: 82%

Microstructure and magnetic properties of MFe2O4 (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method

Wang

Ding

Zhao

et al. 2015

Journal of Applied Physics

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“…1A, the as-synthesized material is phase pure CuFe 2 O 4 , with no evidence of the CuO or a-Fe 2 O 3 impurities commonly found in CuFe 2 O 4 samples. [26][27][28][29][30] Further, Raman spectroscopy is capable of distinguishing between CuO, CuFe 2 O 4 , and a-Fe 2 O 3 . Fig.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

Redox chemistry of a binary transition metal oxide (AB₂O₄): a study of the Cu²⁺/Cu⁰ and Fe³⁺/Fe⁰ interconversions observed upon lithiation in a CuFe₂O₄ battery using X-ray absorption spectroscopy

Cama

Pelliccione

Brady

et al. 2016

Phys. Chem. Chem. Phys.

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Copper ferrite, CuFe2O4, is a promising candidate for application as a high energy electrode material in lithium based batteries. Mechanistic insight on the electrochemical reduction and oxidation processes was gained through the first X-ray absorption spectroscopic study of lithiation and delithiation of CuFe2O4. A phase pure tetragonal CuFe2O4 material was prepared and characterized using laboratory and synchrotron X-ray diffraction, Raman spectroscopy, and transmission electron microscopy. Ex situ X-ray absorption spectroscopy (XAS) measurements were used to study the battery redox processes at the Fe and Cu K-edges, using X-ray absorption near-edge structure (XANES), extended X-ray absorption fine structure (EXAFS), and transmission X-ray microscopy (TXM) spectroscopies. EXAFS analysis showed upon discharge, an initial conversion of 50% of the copper(ii) to copper metal positioned outside of the spinel structure, followed by a migration of tetrahedral iron(iii) cations to octahedral positions previously occupied by copper(ii). Upon charging to 3.5 V, the copper metal remained in the metallic state, while iron metal oxidation to iron(iii) was achieved. The results provide new mechanistic insight regarding the evolution of the local coordination environments at the iron and copper centers upon discharging and charging.

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“…The samples were characterized by X-ray powder diffraction (XRD, However, two weak impurity peaks corresponding to Fe 2 O 3 phase are also observed, which indicates that some Fe hydroxides decompose to form metal oxide in the autoclaves during the crystallization of spinel structure [11]. The average grain sizes (D) are calculated from the X-ray line broadening of the (311) diffraction peak using the Scherrer's equation, as shown in Table 1 change the dielectric constant of mixed solution but also affect the nucleation rate and particle size of the prepared nanoparticles [12].…”

Section: Characterizationmentioning

confidence: 99%

Ethanol-assisted synthesis and adsorption property of flake-like NiFe2O4 nanoparticles

Wang

Ding

et al. 2015

Ceramics International

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Preparation and characterization of spinel-type MeFe2O4 (Me = Cu, Cd, Ni and Zn) for catalyst applications

Cited by 60 publications

References 22 publications

Microstructure and magnetic properties of MFe2O4 (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method

Microstructure and magnetic properties of MFe2O4 (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method

Redox chemistry of a binary transition metal oxide (AB₂O₄): a study of the Cu²⁺/Cu⁰ and Fe³⁺/Fe⁰ interconversions observed upon lithiation in a CuFe₂O₄ battery using X-ray absorption spectroscopy

Ethanol-assisted synthesis and adsorption property of flake-like NiFe2O4 nanoparticles

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Preparation and characterization of spinel-type MeFe2O4 (Me = Cu, Cd, Ni and Zn) for catalyst applications

Cited by 60 publications

References 22 publications

Microstructure and magnetic properties of MFe2O4 (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method

Microstructure and magnetic properties of MFe2O4 (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method

Redox chemistry of a binary transition metal oxide (AB2O4): a study of the Cu2+/Cu0 and Fe3+/Fe0 interconversions observed upon lithiation in a CuFe2O4 battery using X-ray absorption spectroscopy

Ethanol-assisted synthesis and adsorption property of flake-like NiFe2O4 nanoparticles

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Redox chemistry of a binary transition metal oxide (AB₂O₄): a study of the Cu²⁺/Cu⁰ and Fe³⁺/Fe⁰ interconversions observed upon lithiation in a CuFe₂O₄ battery using X-ray absorption spectroscopy