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      Effect of calcination temperature on structural and optical properties of MAl 2O 4 (M = Ni, Cu, Zn) aluminate spinel nanoparticles


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          NiAl 2O 4, CuAl 2O 4, and ZnAl 2O 4 aluminate spinel nanoparticles were synthesized by sol-gel auto combustion method using diethanolamine (DEA) as a fuel. The effects of calcination temperature on structure, crystallinity, morphology, and optical properties of MAl 2O 4 (M = Ni, Cu, Zn) have been investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), UV–visible diffuse reflectance spectroscopy (UV-DRS), and photoluminescence (PL) spectroscopy. The XRD and FT-IR results confirm the formation of single-phase spinel structure of NiAl 2O 4, CuAl 2O 4, and ZnAl 2O 4 at 1200, 1000, and 600 °C, respectively. The direct band gap of these aluminate spinels, calculated from UV-DRS spectra using the Kubelka–Munk function, is found to increase with calcination temperature. The PL spectra demonstrate that NiAl 2O 4 gives the highest blue emission intensity, while CuAl 2O 4 and ZnAl 2O 4 exhibit a very strong violet emission. During fluorescence process, the ZnAl 2O 4 emits visible light in only violet and blue regions, while NiAl 2O 4 and CuAl 2O 4 emissions extend to the green region. It seems therefore that the transition metal type and intrinsic defects in these aluminate powders are responsible for these phenomena.

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          Author and article information

          J Adv Ceram
          Journal of Advanced Ceramics
          Tsinghua University Press and Springer-Verlag Berlin Heidelberg (USA )
          01 September 2019
          01 October 2019
          : 8
          : 3
          : 352-366
          aDepartment of Basic Science and Physical Education, Faculty of Science at Sriracha, Kasetsart University, Sriracha Campus, Chonburi 20230, Thailand
          bDepartment of Physics, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
          cDepartment of Materials Science, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
          Author notes
          *Corresponding author: Thanit TANGCHAROEN, E-mail: sfscitnt@ 123456ku.ac.th
          Copyright © The Author(s)

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by/4.0/.

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