MERCURIO, M.E.CARBONARI, A.W.CORDEIRO, M.R.SAXENA, R.N.D´AGOSTINO, L.Z.2014-07-312014-07-312014-07-312014-07-312010MERCURIO, 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. <b>Journal of Magnetism and Magnetic Materials</b>, v. 322, n. 9-12, p. 1195-1197, 2010. DOI: <a href="https://dx.doi.org/10.1016/j.jmmm.2009.06.051">10.1016/j.jmmm.2009.06.051</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/8174.0304-8853http://repositorio.ipen.br/handle/123456789/8174In 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.1195-1197openAccessairannealingargoncobalt ionsdoped materialselectronic structureindium 111interactionsmagnetic semiconductorsnitrogenperturbed angular correlationsol-gel processx radiationzinc ionszinc oxidesArtigo de periódico9-1232210.1016/j.jmmm.2009.06.051https://orcid.org/0000-0002-4499-5949