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Investigation of the structural and optical properties of sol gel processed Ho-doped BaTiO3 ceramics

Abdelilah Rjeb|Salaheddine Sayouri|Adil Moutaouaffiq|Ali Didi Seddik|Mohammed Naciri Bennani|Mohamed Naji
청정에너지연구소 (Clean-Energy Research Institute)|2023.12|Journal of Ceramic Processing Research|제24권 제6호|pp. 954-962|DOI 10.36410/jcpr.2023.24.6.954

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참고문헌

키워드

Structural analysisSol-gelBa1-xHoxTiO3 ceramicsGap energy
주제분류재료공학

초록

The pure BaTiO3 and Ho doped BaTiO3 (Ba1-xHoxTiO3 with x = 0, 0.25, 0.50, 0.75, 1, 1.5 and 2%), powders were preparedthrough the sol-gel process and structurally characterized by Thermogravimetric analysis (TGA), Differential thermal analysis(DTA), X-Ray diffraction (XRD), Fourier Transform Infrared (FT-IR) and Raman spectroscopy. The optical propertieshave been investigated using Ultraviolet-Visible (UV-Vis) transmittance-reflectance spectroscopy. X-ray diffraction (XRD). The results revealed that the prepared powders, calcined at 1000 °C for 4 hours, crystallized in the pure perovskite structurewithout the presence of secondary phases and showed a slight transition from the quadratic phase (pure BT) to the pseudo-cubic phase for the doped samples. From these results, we can also notice that Ho may occupy both Ba and Ti crystallographicsites. Raman and Fourier Transform Infrared (FT-IR) results are in accordance with those obtained from XRDcharacterizations. The values of the bandgap energies for the doped samples are lower than that of the pure BaTiO3 (3.26eV), thus confirming energy softening effect of Ho.

Abstract

The pure BaTiO3 and Ho doped BaTiO3 (Ba1-xHoxTiO3 with x = 0, 0.25, 0.50, 0.75, 1, 1.5 and 2%), powders were preparedthrough the sol-gel process and structurally characterized by Thermogravimetric analysis (TGA), Differential thermal analysis(DTA), X-Ray diffraction (XRD), Fourier Transform Infrared (FT-IR) and Raman spectroscopy. The optical propertieshave been investigated using Ultraviolet-Visible (UV-Vis) transmittance-reflectance spectroscopy. X-ray diffraction (XRD). The results revealed that the prepared powders, calcined at 1000 °C for 4 hours, crystallized in the pure perovskite structurewithout the presence of secondary phases and showed a slight transition from the quadratic phase (pure BT) to the pseudo-cubic phase for the doped samples. From these results, we can also notice that Ho may occupy both Ba and Ti crystallographicsites. Raman and Fourier Transform Infrared (FT-IR) results are in accordance with those obtained from XRDcharacterizations. The values of the bandgap energies for the doped samples are lower than that of the pure BaTiO3 (3.26eV), thus confirming energy softening effect of Ho.

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