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<p>Hexagonal barium manganite (BaMnO<sub>3</sub>) ceramics were synthesized via the conventional solid-state reaction route and systematically investigated to elucidate the relationship between their structural characteristics and optical response. X-ray diffraction confirmed the formation of a hexagonal perovskite-related phase (P63/mmc), while Williamson–Hall analysis yielded an average crystallite size of 242.32&#xa0;nm with a lattice microstrain of 0.00205. SEM, EDS, and elemental mapping revealed a homogeneous microstructure with uniform elemental distribution. Raman and FTIR spectroscopy confirmed the characteristic MnO<sub>6</sub> octahedral framework of the synthesized BaMnO<sub>3</sub>. UV–Vis spectroscopy exhibited strong ultraviolet absorption with a gradual absorption tail extending into the visible region. The direct optical band gap, estimated using an absorbance-based Tauc analysis, was found to be approximately 2.23&#xa0;eV. The combined crystal structure, vibrational, morphological, compositional, and optical investigations reveal that the optical response of BaMnO<sub>3</sub> is closely associated with its crystallographic characteristics and defect-related electronic structure, suggesting its potential for future ultraviolet optoelectronic and photocatalytic energy-conversion applications.</p>

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Structural, vibrational, morphological, and optical investigation of BaMnO3 ceramics: potential for UV optoelectronic applications

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Aniket Padhy,
  • Praveen Priyaranjan Nayak,
  • S. S. Hota,
  • Biswa Ranjan Swain,
  • Ashish Kumar,
  • Guru Prasad Mishra

摘要

Hexagonal barium manganite (BaMnO3) ceramics were synthesized via the conventional solid-state reaction route and systematically investigated to elucidate the relationship between their structural characteristics and optical response. X-ray diffraction confirmed the formation of a hexagonal perovskite-related phase (P63/mmc), while Williamson–Hall analysis yielded an average crystallite size of 242.32 nm with a lattice microstrain of 0.00205. SEM, EDS, and elemental mapping revealed a homogeneous microstructure with uniform elemental distribution. Raman and FTIR spectroscopy confirmed the characteristic MnO6 octahedral framework of the synthesized BaMnO3. UV–Vis spectroscopy exhibited strong ultraviolet absorption with a gradual absorption tail extending into the visible region. The direct optical band gap, estimated using an absorbance-based Tauc analysis, was found to be approximately 2.23 eV. The combined crystal structure, vibrational, morphological, compositional, and optical investigations reveal that the optical response of BaMnO3 is closely associated with its crystallographic characteristics and defect-related electronic structure, suggesting its potential for future ultraviolet optoelectronic and photocatalytic energy-conversion applications.