Physicochemical properties of MnTiO3 powders obtained by molten salt method

Pure manganese titanate (MnTiO3) powder was successfully synthesized by means of the molten salt method, at 1000 °C for 3 h. The effect of salts used during the synthesis process was evidenced by X-ray diffraction (XRD). Structural parameters were calculated by the Rietveld refinement, where a cryst...

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Bibliographic Details
Published in:Ceramics international 2021-12, Vol.47 (23), p.33315-33321
Main Authors: Koop-Santa, C., Sanchez-Martinez, A., López-Mena, Edgar R., Ponce-Ruiz, Jesus L.A., Orozco-Guareño, E., Ceballos-Sanchez, O.
Format: Article
Language:English
Subjects:
DFT
MnTiO3
Molten salt method
Mott-Schottky
XPS
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Summary:Pure manganese titanate (MnTiO3) powder was successfully synthesized by means of the molten salt method, at 1000 °C for 3 h. The effect of salts used during the synthesis process was evidenced by X-ray diffraction (XRD). Structural parameters were calculated by the Rietveld refinement, where a crystallite size of 292 nm was estimated. Ultraviolet–Visible (UV–Vis) spectroscopy showed that MnTiO3 displays a wide light absorption range, from 200 nm to 800 nm. Through first-principles calculations, the band structure and density of states for ilmenite-type MnTiO3 were estimated, where an indirect band gap of 3.4 eV was obtained. Atomic composition and chemical bonds were determined by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR), respectively. Electrochemical properties of MnTiO3 were analyzed using the Mott-Schottky curve, where an n-type semiconducting behavior and a flat band potential (Efb) of 1.41 V (vs NHE at pH = 0) were observed.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2021.08.234