Magnetic properties of the spinel systems ACr2X4 (A = Zn, Cd, Hg; X = S, Se)

Masrour, R.

doi:10.1016/j.jallcom.2009.09.149

Cited by 35 publications

(4 citation statements)

References 25 publications

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“…In the ferromagneitc ordered phase, the saturation magnetization was reported to be in the range of 5.4-5.98 µ B /mol, which is close to the value expected for the magnetic moments carried by Cr 3+ ions [1,7,10,11]. In fact, the magnetic ordered state in the spinel AB 2 X 4 is determined by the competition between the nearest-neighbor ferromagneitc superexchange B-X-B and high-order-neighbor antiferromagnetic B-X-A-B-X interactions, while the ferromagnetic superexchange is dominant in the CdCr 2 Se 4 system [5]. As a result, the mechanism of the magnetic phase transition of this system is considered as the 90 • Cr 3+ -Se 2− -Cr 3+ superexchange, which is in accordance with the Kanamori-Goodenough rules [12,13].…”

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confidence: 74%

“…Introduction. -Although the selenide CdCr 2 Se 4 has been studied intensively for many decades, it still remains in hot investigations for lots of fantastic physical characteristics related to ferromagnetic or ferroelastic order and electronic transport properties [1][2][3][4][5][6][7]. This spinel structural compound belongs to the cubic cell structure with space group F d3m [8].…”

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confidence: 99%

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Critical properties of the 3D-Heisenberg ferromagnet \chem{CdCr_{2}Se_{4}}

Zhang

Fan

et al. 2010

EPL

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The critical properties of the ferromagnet CdCr2Se4 around the paramagneticferromagnetic phase transition have been investigated. It is found that the 3D-Heisenberg model is the best one to describe the critical phenomena around the critical point. Critical exponents β = 0.337 ± 0.03 and γ = 1.296 ± 0.109 at TC = 130.48 ± 0.34 are obtained. In addition, the critical exponent δ = 4.761 ± 0.129 is determined separately from the isothermal magnetization at TC . These critical exponents fulfill the Widom scaling relation δ = 1 + γ/β. Based on these critical exponents, the magnetization-field-temperature (M -H-T ) data around TC collapses into two curves obeying the single scaling equation M (H, ε) = ε β f±(H/ε β+γ ). Although the 3D-Heisenberg model is the most satisfactory model to describe this system, critical exponents for CdCr2Se4 are slightly smaller than the theoretical exponents (β = 0.36, γ = 1.39 and δ = 4.8). This indicates that the exchange interaction J(r) decays slower than r −5 in this system, which can be attributed to the spin-lattice coupling.

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confidence: 74%

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confidence: 99%

Critical properties of the 3D-Heisenberg ferromagnet \chem{CdCr_{2}Se_{4}}

Zhang

Fan

et al. 2010

EPL

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“…[56,57] The tendency for magnetic phenomena resulting from AFM-FM competition was observed in Zn x Fe 1-x Fe 2 O 4, Zn x Cu 1-x Fe 2 O 4 , [11] Zn x Co 1-x Fe 2 O 4 [58] and in a large variety of other spinels. [59][60][61]…”

Section: Exchange Constants Of Zn 28 Se 34 Fementioning

confidence: 99%

Joint Studies of Spin Frustration Induced by Doping Small ZnSe Nanoparticles with Fe Atoms

Gutsev

Bindra

Strouse

et al. 2022

Advanced Physics Research

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As a 1.8 nm ZnSe nanocrystal is progressively doped with 1%, 5%, and 10% Fe, it shows a progressive change in its magnetic properties from a superparamagnetic FM‐dominated exchange type to an onset of AFM exchange with evidence of spin frustration. Magnetization measurements allow to obtain exchange coupling constants that are compared to the results of a Broken‐Symmetry Density Functional Theory (BS‐DFT) model of a doped (ZnSe)34 cluster. DFT shows a capability to reproduce the experimental pattern of the increasing influence of AFM exchange as doping concentration increases. The material phase segregates at the edges where strained rhombic surface sites are the preferred doping sites of iron. Large concentrations of iron leads to the formation of Fe clusters and complex exchange patterns that result in spin frustration in some iron trimers but none in the others. The spin frustration of these complex systems by assuming mirror symmetry of the sites when fitting by using BS‐DFT formalism is classified and analyzed. While some individual J constants obtained have significant errors, the averaged exchange constants are generally in good agreement with our experimental data.

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“…Manganese ferrites have been used in microwave adsorption [1][2][3], biomedicine [4,5], magnetic recording materials [6], electrode materials [7] and environmental remediation [8,9]. In the MnFe 2 O 4 mixed spinel structure, the metal cations Mn 2+ and Fe 3+ are distributed in the A (tetrahedral) and B (octahedral) positions, and the oxygen anions are formed by the face-centered densely packed [Mn 2+ 1−i Fe 3+ i ] A [Mn 2+ i Fe 3+ 2−i ] B O 4 [10][11][12], where i is the inversion parameter as a reference for the inversion degree. When the manganese cation is on the regular tetrahedron (i = 0), it is characterized as a normal spinel structure, and when the manganese cation is in the octahedron position (i = 1), it is characterized as an inverse spinel structure [10].…”

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Systematic Study on the Synthesis and Magnetism Properties of Manganese Ferrite MnFe2O4 by an Oxidation Roasting Process

Wen,

Chen,

Zhang

et al. 2023

Crystals

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A low-cost and high-efficiency solid reaction method has been reported as an effective technology to synthesize manganese ferrite MnFe2O4 with a spinel crystal structure. This work clarified the underlying reason for the influence mechanism of SiO2 and Al2O3 on the synthesis of MnFe2O4. Synthetic MnFe2O4 polyhedral microparticles with a saturated magnetization of 71.19 emu/g, a ratio of saturation magnetization to residual magnetization (Ms/Mr) of 0.062 and a coercivity (Hc) of 6.50 Oe were successfully obtained at an oxidization roasting temperature of 1100 °C for 60 min. The experimental results indicate that the tetrahedral Mn2+ ions and octahedral Mn3+ ions in the crystal structure of manganese ferrite MnFe2O4 were replaced by tetrahedral Si2+ ions and octahedral Al3+ ions from (Mn2+)x(Fe2+)y(Si2+)1−x−y[Fe3+]2O4 and (Mn2+)[Fe3+]2−x[Al3+]xO4, respectively. In addition, hercynite FexMn1−xAl2O4 with a spinel crystal structure and olivine MnxFe2−xSiO4 with an orthorhombic crystal structure were partially formed in the synthesis of manganese ferrite MnFe2O4, in which some Fe2+ ions were easily replaced by Mn2+ ions to form stable hercynite MnAl2O4 and olivine Mn2SiO4 in these crystal structures. The current research work provides comprehensive insights for synthesizing manganese ferrite MnFe2O4 and continuously advances its technical progress.

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Magnetic properties of the spinel systems ACr2X4 (A = Zn, Cd, Hg; X = S, Se)

Cited by 35 publications

References 25 publications

Critical properties of the 3D-Heisenberg ferromagnet \chem{CdCr_{2}Se_{4}}

Critical properties of the 3D-Heisenberg ferromagnet \chem{CdCr_{2}Se_{4}}

Joint Studies of Spin Frustration Induced by Doping Small ZnSe Nanoparticles with Fe Atoms

Systematic Study on the Synthesis and Magnetism Properties of Manganese Ferrite MnFe2O4 by an Oxidation Roasting Process

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