Paramagnetism in copper monoxide systems

Samokhvalov, A. A.; Arbusova, T. I.; Viglin, N. A.; Наумов, С. В.; Galakhov, V. R.; Zatsepin, D. A.; Kotov, Yu. A.; Саматов, О. М.; Kleshchev, D. G.

doi:10.1134/1.1130290

Cited by 11 publications

(7 citation statements)

References 4 publications

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“…Finally, it can be concluded that the final ferromagnetism of CuO/Cu 2 O nanocomposites is primarily determined by the oxygen vacancy content. [47]. The small magnetization of Cu 2 O/Cu nanocomposite could be attributed to the super exchange interaction at the Cu 2 O/Cu interface which creates a near-contact ferromagnetic layer depending upon the absence of magnetization for the metallic copper.…”

Section: Discussionmentioning

confidence: 97%

One Pot Synthesis, Surface and Magnetic Properties of Cu2O/Cu and Cu2O/CuO Nanocomposites

et al. 2021

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A series of copper-based systems containing two different nanocomposites (Cu2O/CuO and Cu2O/Cu) was synthesized by the egg white assisted auto-combustion route. This method was distinguished by the simplicity of its steps, low cost, one-pot synthesis process at low temperature and, short time. The characterization of the as prepared nanocomposites was carried out by using X-ray diffraction (XRD), Fourier-transform infrared (FTIR), Scanning electron microscope (SEM) and transmission electron micrograph (TEM), Energy dispersive spectrometry (EDS) techniques. Surface and magnetic properties of the obtained systems were determined by using N2 adsorption/desorption isotherms at 77 K and the vibrating sample magnetometer (VSM) technique. XRD results confirmed the formation of Cu2O/CuO and Cu2O/Cu nanocomposites with different ratios of well crystalline CuO, Cu2O, and Cu phases. FTIR results of the combusted product displays the presence of both CuO and Cu2O, respectively. SEM/EDS and TEM results confirm the formation of a porous nanocomposite containing Cu, O, and C elements. The change in concentration of the oxygen vacancies at the surface or interface of both Cu2O/CuO and Cu2O/Cu nanoparticles resulted in different changes in their magnetization. Based on this study, it is possible to obtain nanocomposite-based copper with multiple valances by a simple and inexpensive route which can be suitable for the fabrication of different transition metal composites.

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Section: Discussionmentioning

confidence: 97%

One Pot Synthesis, Surface and Magnetic Properties of Cu2O/Cu and Cu2O/CuO Nanocomposites

et al. 2021

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“…The local stress and diffusion can be further increased by using plasma‐assisted oxidation of copper [13]. The conductive polycrystalline copper oxide nanostructure mixtures are paramagnetic [14], and are known to absorb microwaves, mostly through dielectric loss [15]. The copper oxide layer is also redox‐active.…”

Section: Resultsmentioning

confidence: 99%

Broadband Microwave Signal Dissipation in Nanostructured Copper Oxide at Air‐film Interface**

et al. 2020

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Contactless broadband microwave spectroscopy (a.k.a., broadband dielectric spectroscopy (BDS)) enables the accurate operando analysis of the electrical and magnetic properties without compromising the kinetic conditions of the experiment. The BDS method is sensitive to the actual electronic structure of species, and it is most relevant to redox reactions involving chargetransfer. In this paper, using BDS, we have studied and characterized the oxidation of a copper layer in a purposely built prototypical 3-D integrated circuit (3D-IC) during cycled high-temperature storage. We show that the microwave signal loss in these devices is attributable to the energy dissipation through the signal's interactions with the copper oxidation product. The results demonstrate that contactless BDS could be leveraged into an excellent metrology for applications that use metal oxide as sensing elements.

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“…Some such of interesting materials are the high-temperature superconductors. The investigations carried out in the Institute of Metal Physics, Ekaterinburg (Samokhvalov et al, 1998) on basis of copper oxide have shown, that there exist the localized areas of superconductive phase in partially restored samples of CuO. The volume of the phase was found 2-3%, and the critical temperature up to 200-300K.…”

Section: Superconductivity and Copper Oxidementioning

confidence: 98%

“…But the bulk sample CuO with NaCl structure has not yet synthesized up to now. X-ray study of the similar compound -Cu 0.2 Mg 0.8 O (Samokhvalov et al, 1999) shows that there is a single phase with NaCl structure. The present work is devoted to the short range order investigation of this solid state solution.…”

Section: Superconductivity and Copper Oxidementioning

confidence: 98%

Bond length determination in Cu-Mg-O by EXAFS spectroscopy

Sidorenko

Gins

Babanov

et al. 2001

J Synchrotron Radiat

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Magnetic semiconductors such as Cu(x)Mg(1-x)O, which are perspective materials for high-temperature superconductivity have been studied by EXAFS. The new technique of obtaining information from EXAFS-data has been described. It is based on the special iterative algorithm of solving an inverse ill-posed problem on the determination the partial pair correlation functions (pPCFs). Bond lengths of the nearest neighbours have been determined. It was clearly shown that the short range order in compound Cu0.2Mg0.8O differs from a hypothetical alloy with MgO structure and from the copper oxide.

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Paramagnetism in copper monoxide systems

Cited by 11 publications

References 4 publications

One Pot Synthesis, Surface and Magnetic Properties of Cu2O/Cu and Cu2O/CuO Nanocomposites

One Pot Synthesis, Surface and Magnetic Properties of Cu2O/Cu and Cu2O/CuO Nanocomposites

Broadband Microwave Signal Dissipation in Nanostructured Copper Oxide at Air‐film Interface**

Bond length determination in Cu-Mg-O by EXAFS spectroscopy

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