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Effect of Ni-doping on structural, dielectric, and magnetic properties of CdO nanoparticles

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Abstract

In the present studies, we are reporting synthesis, structural, microstructural, optical dielectric, and magnetic properties of pristine and Ni-doped CdO (Cd1-xNixO, 0% ≤ x ≤ 10%) nanoparticles. Co-precipitation method was used to synthesize these nanoparticles. X-ray diffraction patterns show the cubic phase of polycrystalline Cd1–xNixO nanoparticles along with the formation of secondary NiO phase at higher Ni-content. The XPS spectra indicate the presence of oxygen vacancies along with mixed oxidation states of nickel (Ni2+ and Ni3+) and cadmium (Cd2+, Cd4+). FESEM micrographs show non uniform distribution of grains in these nanoparticles. The observed Raman peaks show that Ni2+ ions are successfully substituted at the Cd2+ lattice sites in the host lattice of CdO. The decrease in ac-conductivity of CdO with Ni-doping indicates the segregation of defects (Cd interstitials and oxygen vacancies) at grain boundaries. The conduction phenomena are explained by correlated barrier hopping mechanism in these nanoparticles. The optical band-gap broadening of CdO with Ni-doping show the influence of carrier densities. Ferromagnetic ordering in these nanoparticles is explained using bound magnetic polarons’ (BMPs) model.

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Leelavati: conceptualization, methodology, and writing—original draft. Rajesh Kumar: supervision, and writing—review & editing. Ravi Kumar: formal analysis and investigation.

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Leelavati, Kumar, R. & Kumar, R. Effect of Ni-doping on structural, dielectric, and magnetic properties of CdO nanoparticles. Appl. Phys. A 129, 604 (2023). https://doi.org/10.1007/s00339-023-06850-4

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