Optical properties of BiFe0.95Mn0.05O3nanoparticles & BiFe0.95Mn0.05O3@SiO2nanocomposite

S. Nayak, Subhra S. Brahma, J. Nanda, C. Mahender

Research output: Contribution to journalConference articlepeer-review


Transition metal ion (Mn2+) doped BiFeO3 (BiFe0.95Mn0.05O3) nanoparticles were synthesized by low temperature polymer assisted hydrothermal method. The core/shell BiFe0.95Mn0.05O3@SiO2 nanocomposite was prepared using Stöber method. X-ray diffraction patterns with rietveld analysis confirm a FeO6 octahedron distorted rhombohedral structure. The formation of amorphous silica shell was ensured through the observance of a broad hump in the XRD pattern, FESEM and HRTEM microstructures and UV-Vis studies. The particles with an average size of 127 nm were found to be agglomerated and covered with a silica layer of approximately 10-12 nm. The energy band gaps (Eg) were determined from the diffused reflectance spectra by using Tauc's relation. It was observed that the Mn2+ doping decreased the Eg values to 1.75 eV as compared to that of 2.01 eV for pristine BFO. The optical spectrum of the nanocomposite exhibited two bandgaps, i.e 2.31 eV for BFMO and 5.1 eV for SiO2 shell. The observed 6A1g ? 4T2g transition at 1.88 eV and p-d CT transitions at 3.27 eV are found to be red-shifted in comparison to pristine BFO and may be attributed to the slight disturbance in FeO6 octahedra because of Mn2+ substitution.

Original languageEnglish
Pages (from-to)170-174
Number of pages5
JournalMaterials Today: Proceedings
Publication statusPublished - 01-01-2021
Event2019 International Conference on Nanomaterials for Energy, Environment and Sustainability, ICNEES 2019 - Bhubaneswar, India
Duration: 15-12-201915-12-2019

All Science Journal Classification (ASJC) codes

  • Materials Science(all)


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