Magnetic transformation of Zn-substituted Mg-Co ferrite nanoparticles: Hard magnetism → soft magnetism

Zhang, Wei; Sun, Aimin; Pan, Xiaoguang; Han, Yingqiang; Zhao, Xiqian; Yu, Lichao; Zuo, Zhuo; Suo, Nanzhaxi

doi:10.1016/j.jmmm.2020.166623

Cited by 32 publications

(17 citation statements)

References 60 publications

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“…For reverse spinel ferrite, 16 Fe 3+ ions occupy evenly both A and B sites, 8 M 2+ locate at B site. According to Néel sublattice models, the cation distribution can expressed as follows [37]: where lattice constant (a), O 2− radius (r 0 , 0.140 nm), Ni 2+ radius (0.072 nm), Co 2+ radius (0.065 nm), Zn 2+ radius (0.074 nm) and Fe 3+ radius (0.064 nm). As shown in Table 4, we can see the values of 'r B ' and 'u.'…”

Section: Cation Distributionmentioning

confidence: 99%

The structural, magnetic and optical performances of Ni0.2Zn0.2Co0.6Fe2O4 ferrites synthesized by sol-gel route

2021

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In this work, four complexing agents participated in the synthesis of Ni 0.2 Zn 0.2 Co 0.6 Fe 2 O 4 ferrites by sol-gel route. The X-ray diffraction (XRD) pattern showed that samples had formed spinel phase. The Fourier transform infrared (FTIR) spectra of samples showed two absorption bands around 400 cm −1 and 600 cm −1 , which are the characteristics of spinel ferrites. SEM micrographs showed that the prepared particles had different shape. Vibrating sample magnetometer was used to characterize magnetic performances. The prepared samples showed typical hysteresis behaviors at room temperature. The Ni 0.2 Zn 0.2 Co 0.6 Fe 2 O 4 ferrite sample prepared with egg white as a complexing agent had high coercivity (1365.52 Oe) and remanent magnetization (23.95 emu/g), which indicated that the sample had a potential applications for magnetic storage devices. The sample prepared with egg white had a coercivity six times higher than coercivities (168.44-200.47 Oe) of other samples. These findings revealed that egg white is a suitable complexing agent to prepare Ni 0.2 Zn 0.2 Co 0.6 Fe 2 O 4 hard ferrite by sol-gel route. The optical properties are characterized using PL emission spectra and UV-visible absorption spectrum. From the optical band gap (Eg) value, the sample has the characteristics of a semiconductor material. KeywordsNi 0.2 Zn 0.2 Co 0.6 Fe 2 O 4 ferrite • Sol-gel route • Four complexing agents • Magnetic performances • Optical performances

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Section: Cation Distributionmentioning

confidence: 99%

The structural, magnetic and optical performances of Ni0.2Zn0.2Co0.6Fe2O4 ferrites synthesized by sol-gel route

2021

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“…The transition metal-based magnetic oxide materials are the focus of contemporary research in magnetism due to their stable physicochemical properties and appealing room-temperature device applications [1]. Among these magnetic oxides, ferrites are fascinating materials with room-temperature ferrimagnetic ordering encourages to explore them for suitable application as well as to study the fundamental science [2]. The ferrimagnetic spinels with compositional formula, + + -A B O 2 where, A(=divalent cation such as Mg, Fe, Co, Ni, Zn, etc.)…”

Section: Introductionmentioning

confidence: 99%

Influence of cation distribution on magnetic response of polycrystalline Co_1−xNi_xFe₂O₄ (0 ≤ x ≤ 1) ferrites

et al. 2020

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The present paper reports the interconnection between cation distribution and physical properties of Co1−xNixFe2O4 (0 ≤ x ≤ 1) samples to tune them for suitable applications at room temperature. A set of five Co1−xNixFe2O4 (CNFO) samples with different nickel concentration (x) were prepared by using citrate-based ‘sol-gel’ method. The x-ray diffraction (XRD), Raman spectroscopic and scanning electron microscopic techniques were employed to characterize the samples structurally and morphologically. The Rietveld refinement of diffraction data confirms the monophasic spinel cubic structure with space group. The cationic arrangement between the tetrahedral (A-) and octahedral (B-)sites of (AB2O4-type) CNFO samples was estimated from the diffraction intensities of XRD and the spectral peaks of Raman data. Based on the cation arrangement, the estimated magnetic moment values, by adopting Neel’s sublattice model, were in correlation with each other and found to reduce with the rise in nickel content. A systematic change in the lattice, spectral and magnetic parameters with an increase in nickel content in CNFO, clearly ensures the transformation from hard to soft magnetic behavior of the samples. The marked magnetic transformation was elucidated in the framework of cation distribution. The tuning of magnetic parameters and cation distribution in ferrites with an appropriate element substitution might be a viable approach to make them for desired high-frequency magnetic applications.

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“…The main peaks at 23.88 • , 25.39 • , 27.10 • , 42.00 • , 45.81 • , and 49.72 • can be indexed to the (100), (002), ( 101), ( 110), (103), and (112) crystal planes. Here, the crystallite sizes of ZO and CS are calculated from Scherrer's formula [21] to be 28.04 and 20.04 nm, respectively. XRD patterns of ZO/CS nanocomposites contain peaks of ZO and CS, and peaks of CS are gradually highlighted with increasing CS content in ZO/CS (as shown by dashed boxes in Figure 1a).…”

Section: Phase and Microscopic Morphology Analysismentioning

confidence: 99%

“…Yet, there were still no substantial changes in the band structure, light absorption characteristics, or the charge mobility of a single photocatalyst. In recent years, more and more researchers have found that the mutual recombination between semiconductor materials can effectively solve the shortcomings of a single photocatalyst [19][20][21][22][23][24][25][26]. For example, Ma et al combined CdSe with WO 3 (H 2 O) 0.333 to significantly enhance the photocatalytic hydrogen evolution activity of single materials [24].…”

Section: Introductionmentioning

confidence: 99%

Efficient and Stable Catalytic Hydrogen Evolution of ZrO2/CdSe-DETA Nanocomposites under Visible Light

Zhai

et al. 2022

Catalysts

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Composite photocatalysts are crucial for photocatalytic hydrogen evolution. In this work, ZrO2/CdSe-diethylenetriamine (ZrO2/CdSe-DETA) heterojunction nanocomposites are synthesized, and efficiently and stably catalyzed hydrogen evolution under visible light. X-ray photoelectron spectroscopy (XPS) and high resolution transmission electron microscope (HRTEM) confirm the formation of heterojunctions between ZrO2 (ZO) and CdSe-DETA (CS). Ultraviolet–visible spectroscopy diffuse reflectance spectra (UV-vis DRS), Mott–Schottky, and theoretical calculations confirm that the mechanism at the heterojunction of the ZrO2/CdSe-DETA (ZO/CS) nanocomposites is Type-I. Among the ZO/CS nanocomposites (ZO/CS-0.4, ZO/CS-0.6, and ZO/CS-0.8; in the nanocomposites, the mass ratio of ZO to CS is 0.1:0.0765, 0.1:0.1148, and 0.1:0.1531, respectively). ZO/CS-0.6 nanocomposite has the best photocatalytic hydrogen evolution activity (4.27 mmol g−1 h−1), which is significantly higher than ZO (trace) and CS (1.75 mmol g−1 h−1). Within four cycles, the ZO/CS-0.6 nanocomposite maintains an efficient catalytic hydrogen evolution rate. Due to the existence of the heterojunction of the composites, the photogenerated electron-hole pairs can be effectively separated, which accelerates the photocatalytic hydrogen evolution reaction and reduces the progress of photocorrosion. This work reveals the feasibility of ZO/CS nanocomposite photocatalysts for hydrogen evolution.

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Magnetic transformation of Zn-substituted Mg-Co ferrite nanoparticles: Hard magnetism → soft magnetism

Cited by 32 publications

References 60 publications

The structural, magnetic and optical performances of Ni0.2Zn0.2Co0.6Fe2O4 ferrites synthesized by sol-gel route

The structural, magnetic and optical performances of Ni0.2Zn0.2Co0.6Fe2O4 ferrites synthesized by sol-gel route

Influence of cation distribution on magnetic response of polycrystalline Co_1−xNi_xFe₂O₄ (0 ≤ x ≤ 1) ferrites

Efficient and Stable Catalytic Hydrogen Evolution of ZrO2/CdSe-DETA Nanocomposites under Visible Light

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Magnetic transformation of Zn-substituted Mg-Co ferrite nanoparticles: Hard magnetism → soft magnetism

Cited by 32 publications

References 60 publications

The structural, magnetic and optical performances of Ni0.2Zn0.2Co0.6Fe2O4 ferrites synthesized by sol-gel route

The structural, magnetic and optical performances of Ni0.2Zn0.2Co0.6Fe2O4 ferrites synthesized by sol-gel route

Influence of cation distribution on magnetic response of polycrystalline Co1−x Ni x Fe2O4 (0 ≤ x ≤ 1) ferrites

Efficient and Stable Catalytic Hydrogen Evolution of ZrO2/CdSe-DETA Nanocomposites under Visible Light

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Magnetic transformation of Zn-substituted Mg-Co ferrite nanoparticles: Hard magnetism → soft magnetism

Influence of cation distribution on magnetic response of polycrystalline Co_1−xNi_xFe₂O₄ (0 ≤ x ≤ 1) ferrites