Local investigation of hyperfine interactions in pure and Co-doped ZnO
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Journal of Magnetism and Magnetic Materials
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In the present work bulk samples of pure as well as Co-doped ZnO with different concentrations were prepared by sol–gel method from highly pure metallic Zn (99.9999%) and Co (99.9999%). The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray microanalysis (EDS) and perturbed gamma–gamma angular correlation (PAC) spectroscopy. Carrier-free 111In nuclei were introduced during preparation of the samples and used as probe nuclei at Zn sites for PAC measurements. PAC results show that both pure and Zn1 xCoxO(xr0:15) samples have the same electric quadrupole frequency when Co-doped samples are annealed in air, argon or nitrogen atmosphere at 1173K. SEM and EDS results showed that Co-doped samples are homogeneous without any secondary Co phases. These observations indicate that Co ions are substituted for Zn ions and have a similar electronic structure of Zn ions. A weak local magnetism was observed at temperatures below about 300K for Co concentration of 10% when sample was annealed in Nitrogen.
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MERCURIO, M.E.; CARBONARI, A.W.; CORDEIRO, M.R.; SAXENA, R.N.; D´AGOSTINO, L.Z. Local investigation of hyperfine interactions in pure and Co-doped ZnO. Journal of Magnetism and Magnetic Materials, v. 322, n. 9-12, p. 1195-1197, 2010. DOI: 10.1016/j.jmmm.2009.06.051. Disponível em: http://repositorio.ipen.br/handle/123456789/8174. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.