Magnetic properties of chalcogenide spinel CuCr2Se4 nanocrystals

Tsoi, G. M.; Wenger, L. E.; Wang, Y.-H.A.; Gupta, Arunava

doi:10.1016/j.jmmm.2009.08.042

Cited by 9 publications

(5 citation statements)

References 29 publications

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Section: Introductionmentioning

confidence: 99%

“…Interesting properties of CuCr 2 X 4 spinel mono-and polycrystals became an inspiration for their research in the nanoscale [7][8][9][10][11]. CuCr 2 Se 4 nanopinels were obtained using microwave-assisted polyol synthesis [7,8] or thermal decomposition and a reaction of mixed metal-oleate complexes with selenium in a high-boiling organic solvent [9][10][11]. It was established that (1) the Curie temperature of the nanocrystals exceeded the value obtained for a common bulk polycrystalline spinel sample [7,8], (2) the crystallites were ferromagnetic at room temperature and exhibited a low-temperature magnetic moment of about 2.3 µ B per Cr, which is close to reported value for the bulk [9], and (3) increasing the size of the crystallites from 15 to 25 nm led to an increase in the Curie temperature from 395 to 413 K, which is still below the corresponding bulk value of 430 K. Also, saturation magnetization, Curie-Weiss temperature, and the effective magnetic moment turned out to be lower than the bulk [10].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic and Electrical Properties of CuCr2Se4 Nanoparticles

Malicka,

Groń,

Gudwański

et al. 2023

Materials

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CuCr2Se4 nanoparticles were obtained by the high-energy ball milling of CuCr2Se4 single crystals, which had a size of approximately 32 nm after 5 h of milling. Structural, magnetic, and electrical studies have shown that a reduction in CuCr2Se4 single crystals to the nanosize leads to (1) a weakening of ferromagnetic interactions, both long and short range, (2) a lack of saturation of magnetization at 5 K and 70 kOe, (3) a change in the nature of electrical conductivity from metallic to semiconductor, and (4) a reduction in the thermoelectric power factor S2σ by an order of magnitude of 400 K. The above results were considered in terms of the parameters of the band model, derived from the high-temperature expansion of magnetic susceptibility and from the diffusive component of thermoelectric power. Theoretical calculations showed a significant weakening of both the superexchange and double exchange mechanisms, a reduction in the [Cr3+,Cr4+] band width from 0.76 to 0.19 eV, and comparable values of the Fermi energy and the activation energy (0.46 eV) in the intrinsic region of electrical conductivity. The main advantage of high-energy ball milling is the ability to modify the physicochemical properties of already existing compounds for desired applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic and Electrical Properties of CuCr2Se4 Nanoparticles

Malicka,

Groń,

Gudwański

et al. 2023

Materials

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“…It is particularly worth mentioning that Gupta’s group has achieved a large number of remarkable results concerning the synthesis, properties, and applications of Cr-based chalcospinel nanomaterials. Based on wet chemical colloidal synthesis technology, they have successfully obtained a series of phase-pure Cr-based chalcospinel nanocrystals, − which greatly contributed to the development of this material system. Meanwhile, some other synthesis techniques, including the microwave-assisted polyol method, − mechanical alloying, − thermal decomposition, solvothermal reactions, and sonochemical synthesis, have also been successfully applied to the preparation of Cr-based chalcospinels.…”

Section: Introductionmentioning

confidence: 99%

Novel Strategy toward Chromium-Based Thiospinel Multifunctional Magnetic Materials from Amorphous Chromites

Tang

et al. 2022

Crystal Growth & Design

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Magnetic nanomaterials have a broad range of promising applications in mechanical, electronic, optical, magnetic, chemical, and biological fields due to their excellent physicochemical properties, especially their unique magnetic properties. Chromium-based chalcospinels exhibit a variety of magnetic and electrical properties and attract widespread attention. Although the physical properties of Cr-based chalcospinels have been extensively studied, the fabrication of their micro/nanostructures has always been a challenge. In the present work, we develop a novel method for the preparation of Cr-based chalcospinels. The representative ferrimagnetic semiconductor CoCr 2 S 4 , ferromagnetic metal CuCr 2 S 4 , and ferromagnetic semiconductor CdCr 2 S 4 are successfully synthesized by direct sulfurization in a solvothermal system using amorphous metal chromites as the precursors. The phase structure, chemical composition, crystal morphology, optical absorption, and magnetic properties of the obtained samples are analyzed comprehensively. The experimental results demonstrate that the prepared CoCr 2 S 4 and CdCr 2 S 4 samples have direct band gaps of 1.71 and 2.49 eV, and their Curie temperatures are about 206 and 90 K, respectively, while the Curie temperature of the CuCr 2 S 4 sample is higher than room temperature. More importantly, the as-established synthesis methodology is expected to be further extended to other Cr-based chalcospinels, thus opening a new avenue for the potentially universal preparation of this material system.

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“…Most of the research on CuCr 2 Se 4 was conducted on bulk or nanocrystalline compounds, but in order to be technologically relevant approaches to prepare thin films of these compounds need to be developed. [11,13,24,27,28] Thin films of CuCr 2 Se 4 , however, have proven to be difficult to synthesize. The first to report films with the composition close to CuCr 2 Se 4 were Berzhansky et al, yet without structural characterization.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structure and magnetic properties of crystallographically aligned CuCr2Se4 thin films

Esters

Liebig

Ditto

et al. 2016

Journal of Alloys and Compounds

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We report the low temperature synthesis of highly textured CuCr 2 Se 4 thin films using the modulated elemental reactant (MER) method. The structure of CuCr 2 Se 4 is determined for the first time in its thin film form and exhibits cell parameters that are smaller than found in bulk CuCr 2 Se 4. X-ray diffraction and precession electron diffraction show a strong degree of crystallographic alignment of the crystallites, where the <111> axis is oriented perpendicular to the substrate surface, while being rotationally disordered within the plane. Temperature and field dependent in-plane and out-of-plane magnetization measurements show that the film is ferromagnetic with a Curie temperature of 406 K. CuCr 2 Se 4 synthesized utilizing the MER method shows stronger magnetic anisotropy (effective anisotropy:-; shape anisotropy:-, with the easy axis lying out of plane, and a larger magnetic moment (6  B /f.u.) than bulk CuCr 2 Se 4 .

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Magnetic properties of chalcogenide spinel CuCr2Se4 nanocrystals

Cited by 9 publications

References 29 publications

Magnetic and Electrical Properties of CuCr2Se4 Nanoparticles

Magnetic and Electrical Properties of CuCr2Se4 Nanoparticles

Novel Strategy toward Chromium-Based Thiospinel Multifunctional Magnetic Materials from Amorphous Chromites

Synthesis, structure and magnetic properties of crystallographically aligned CuCr2Se4 thin films

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