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Structural, Optical and EPR Study of Mn-Doped ZnO Nanocrystals

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Abstract

This paper presents the study of manganese-doped ZnO (Zn1−xMnxO) nanocrystals produced using the sol–gel method. In samples calcinated at a temperature of 873 K, we analyzed the influence of the manganese concentration on the structure and optical properties of these samples. From X-ray analysis, it could be inferred that there were no other phases in the Mn-doped samples, apart from a wurtzite phase. The lattice parameters do not change significantly with Mn concentration. c/a ratio exhibits a slight deviation when it is compared with the value of an optimal hexagonal closed-packed structure. Crystal size (Ds) was higher for Mn-doped samples, except for ZnO with 3% Mn doped. From UV–Vis measurements, band gap (Eg) values showed a blueshift (reduction in bandgap) when Mn concentration was higher than 3%. Electron paramagnetic resonance results determined that Mn ions were incorporated into the ZnO lattice in place of Zn2+, occupying a rhombic distortion of tetrahedral local symmetry.

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Acknowledgements

The authors wish to thank the Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS) for their financial support for F. Acosta-Humánez, through the scholarships. We would also like to thank the Universidad Nacional de Colombia where the research was conducted. Additionally, the authors thank Prof. Magon from the Universidad do Sâo Paulo—Campus Sâo Carlos for the electron paramagnetic resonance measurements.

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Authors and Affiliations

  1. Grupo de Física Aplicada, Departamento de Física, Universidad Nacional de Colombia - Sede Bogotá, Carrera 30 No. 45 – 03, edificio 404, Bogotá, Colombia

    F. Acosta-Humánez & O. Almanza

  2. Departamento de Geociencias, Universidad Nacional de Colombia, Carrera 30 No. 45 – 03, Edificio Manuel Ancízar, Of. 326, Bogotá, Colombia

    Luis Montes-Vides

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  1. F. Acosta-Humánez
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  3. O. Almanza
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Correspondence to O. Almanza.

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Acosta-Humánez, F., Montes-Vides, L. & Almanza, O. Structural, Optical and EPR Study of Mn-Doped ZnO Nanocrystals. J Low Temp Phys 195, 391–402 (2019). https://doi.org/10.1007/s10909-019-02170-1

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