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On the structural analysis and magnetic behavior of heavily doped Zn1−xMnxO nanopowders synthesized by wet chemistry method |
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| Authors: | J Mera C Córdoba C Paucar A Gómez D Fuchs O Morán |
| Institution: | 1. Centro de Investigaciones en Materiales, Facultad de Ingeniería, Universidad de Nariño, Ciudad Universitaria Torobajo, Pasto, Colombia;2. Laboratorio de Materiales Cerámicos y Vítreos, Departamento de Física, Universidad Nacional de Colombia, Sede Medellín, A.A. 568, Medellín, Colombia;3. Laboratorio de caracterización de materiales, Universidad Nacional de Colombia, Sede Medellín, A.A. 568, Medellín, Colombia;4. Karlsruhe Institute of Technology, Institut für Festkörperphysik, Postfach 3640, Karlsruhe, Germany |
| Abstract: | Nanocrystalline Zn1−xMnxO(x=0−0.1) powders are prepared by polymeric precursor method and their structural and magnetic properties carefully studied. X-ray diffraction studies and Raman spectroscopy reveal that Mn2+ ions have substituted the Zn2+ ion without changing the würtzite structure of pristine ZnO up to Mn concentrations x≤0.05. The presence of a secondary phase, related to the solubility of Mn in ZnO is evident for higher Mn-doping concentrations. The negative value obtained for the Curie–Weiss temperature indicates that the interactions between the Mn ions are predominantly antiferromagnetic. Thus, no bulk ferromagnetism is evident in any of the studied samples. |
| Keywords: | Diluted magnetic semiconductors Pechini's method X-ray diffraction Raman spectroscopy Magnetization measurements |
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