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Journal of Metals, Materials and Minerals

Publication Date

2025

Abstract

This work assessed the potential of bismuth manganese oxide composite ceramic for optoelectronic applications by methodically examining its structural, vibrational, and optical characteristics. X-ray diffraction (XRD) spectroscopy provided the coexistence of Bi12MnO20 (sillenite-type) and Bi2Mn4O10 (mullite-type) phases, indicating a deviation from the ideal perovskite structure and suggesting a complex crystallographic nature influencing its functional properties. Fourier transform infrared (FTIR) spectroscopy confirmed the modes of vibration of Bi–O and Mn–O bonds that were contained, supporting the structural composition. UV-Vis-NIR spectroscopy demonstrated strong optical absorption in the 300 nm to 800 nm range, affirming the suitability of the material for optoelectronic applications. The bandgap energy was determined to be 3.091 eV, with Tauc's analysis revealing direct transitions at 0.66 eV and 5.15 eV and indirect transitions at 1.11 eV and 5.17 eV, suggesting multiple electronic absorption mechanisms. The Urbach energy of 3.34 eV indicated significant structural disorder due to composite nature and lattice distortions. Additionally, extinction coefficient and penetration depth analysis confirmed strong light-matter interaction, reinforcing potential properties for optical coatings, photodetectors, and energy-harvesting applications.

DOI

10.55713/jmmm.v35i4.2401

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