Synthesis, structural and magnetic studies of the CuCr1−xCoxO2 delafossite oxide

Elkhouni, T.; Amami, Mongi; Colin, Claire; Strobel, Pierre; Salah, A. Ben

doi:10.1016/j.jmmm.2012.10.037

Cited by 27 publications

(14 citation statements)

References 30 publications

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“…The former implies the vibration of Cu-O bond along the c-axis, while the latter represents movement in the triangular lattice perpendicular to the c-axis[29,30]. As is shown in Figure2, the spectrum of CuFeO 2 displays two typical vibrational modes, which is consistent with other delafossite structure[31,32]. The two modes identified as σ(A 1g ) at 685 cm −1 and σ(E g ) at 344 cm −1 may be related to the spectral features of the O-Cu-O chain and edge-sharing FeO 6 octahedra, respectively.…”

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confidence: 78%

Regulation of Cr³⁺ doping on the defect characteristics and magnetic order in the CuFe_1-xCr_xO₂ ceramics

Sun

et al. 2021

Journal of Asian Ceramic Societies

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The defect characteristic and magnetic properties of CuFe 1-x Cr x O 2 (x = 0.0-0.4) compounds have been investigated in detail. The results demonstrate that Cr 3+ ions enter into the CuFeO 2 lattice sites and induce local lattice contraction but do not change the valance state of Cu + and Fe 3+ ions. We calculate the positron annihilation lifetime in the bulk and vacancy defect trapping states by the atomic superposition method in 3 × 3 × 1 CuFeO 2 super-cell. Combined with theoretical calculation results, the positron annihilation results indicate that the positrons are mainly annihilated in vacancy clusters in CuFe 1-x Cr x O 2 . The substitution of Cr 3 + for Fe 3+ ions decreases the open volume and increases the concentration of vacancy defects but does not change the integral defect surroundings at annihilation sites. Magnetization measurements manifest that doping with Cr 3+ reduces the antiferromagnetic transition temperature and promotes the formation of short-range magnetic correlation. Meanwhile, the enhanced short-range magnetic correlation in Cr 3+ -doped CuFeO 2 is more readily driven by thermal activation energy and a faster dynamic behavior can be seen in time windows.

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confidence: 78%

Regulation of Cr³⁺ doping on the defect characteristics and magnetic order in the CuFe_1-xCr_xO₂ ceramics

Sun

et al. 2021

Journal of Asian Ceramic Societies

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“…Dong et al * corresponding author; e-mail: k.siedliska@pollub.pl synthesized thin films of Co-doped transparent CuAlO 2 semiconductors which exhibited weak ferromagnetism at room temperature [10]. Likewise, Elkhouni et al presented several papers on cobalt substituted CuCrO 2 and proved that the incorporation of magnetic ions into delafossite structure induce new spin ordering and enhance magnetization [11,12].…”

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confidence: 99%

X-ray Diffraction and ⁵⁷Fe Mössbauer Spectroscopy Studies of Co-Doped AgFeO₂

et al. 2018

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Delafossite AgFe1−xCoxO2 (x = 0, 0.05, 0.1, 0.2) powders were synthesized by co-precipitation method. The structural analysis and hyperfine interactions investigations were performed by X-ray diffraction and the Mössbauer spectroscopy. It was found that the Co-doped delafossite phase with traces of metallic silver was obtained. The investigated samples were fine powders which are typical of the materials synthesized by co-precipitation. The Mössbauer spectroscopy studies revealed random incorporation of cobalt ions into the crystalline lattice of delafossite. Doping of cobalt ions caused the distortion of the oxygen octahedra in AgFeO2 which was observed in the increase of the quadrupole splitting value.

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“…It appears that there are 2 important elements, namely Cu-O dumbbells and CrO6 layers where each element affects the physical properties of CuCrO2 crystals. The electrical properties of CuCrO2 are influenced by Cu-O dumbbells [19], [20] while the magnetic properties are influenced by the planar CrO6 [12,21]. If the distance between Cu -O gets bigger, the atomic volume will be bigger which will make the electrons along the dumbbell move easier so that it will increase the conductivity value [16,22].…”

Section: Resultsmentioning

confidence: 99%

CRYSTAL STRUCTURE ANALYSIS OF CuCrO2 BASED ON XRD DATA USING GSAS SOFTWARE

Didik¹,

Wahyudi²

2021

IPR

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The synthesis of CuCrO2 crystals by mixing CuO and Cr2O3 has been carried out using the solid reaction method at a temperature of 1200 0C. The characterization of the structure used XRD and analyzed using GSAS software. The results of characterization using XRD showed that no other phase occurred. This is evidenced by the absence of other phases from the results of refinement of measurement data with reference data and a value of χ 2 which is 1.222. The lattice parameter values resulting from the refinement of the CuCrO2 X-ray diffraction pattern are a = b = 2.9715 Å and c = 17.1104 Å with a cell volume of 130.584 Å 3. In addition to the lattice parameter values, the distance between atoms was also obtained, both Cu - O, Cr - Cr, and Cr - O.

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Synthesis, structural and magnetic studies of the CuCr1−xCoxO2 delafossite oxide

Cited by 27 publications

References 30 publications

Regulation of Cr³⁺ doping on the defect characteristics and magnetic order in the CuFe_1-xCr_xO₂ ceramics

Regulation of Cr³⁺ doping on the defect characteristics and magnetic order in the CuFe_1-xCr_xO₂ ceramics

X-ray Diffraction and ⁵⁷Fe Mössbauer Spectroscopy Studies of Co-Doped AgFeO₂

CRYSTAL STRUCTURE ANALYSIS OF CuCrO2 BASED ON XRD DATA USING GSAS SOFTWARE

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Synthesis, structural and magnetic studies of the CuCr1−xCoxO2 delafossite oxide

Cited by 27 publications

References 30 publications

Regulation of Cr3+ doping on the defect characteristics and magnetic order in the CuFe1-xCrxO2 ceramics

Regulation of Cr3+ doping on the defect characteristics and magnetic order in the CuFe1-xCrxO2 ceramics

X-ray Diffraction and 57Fe Mössbauer Spectroscopy Studies of Co-Doped AgFeO2

CRYSTAL STRUCTURE ANALYSIS OF CuCrO2 BASED ON XRD DATA USING GSAS SOFTWARE

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Regulation of Cr³⁺ doping on the defect characteristics and magnetic order in the CuFe_1-xCr_xO₂ ceramics

Regulation of Cr³⁺ doping on the defect characteristics and magnetic order in the CuFe_1-xCr_xO₂ ceramics

X-ray Diffraction and ⁵⁷Fe Mössbauer Spectroscopy Studies of Co-Doped AgFeO₂