Issue 12, 2024

Interband electronic transitions and optical phonon modes in size-dependent multiferroic BiFeO3 nanoparticles

Abstract

Bismuth ferrite (BiFeO3) multiferroic nanoparticles are synthesized using a low-temperature sol–gel auto-combustion technique. The phase purity is confirmed from X-ray diffraction (XRD) measurements and microstructural, electronic, and optical studies are correlated with the particle size of the bismuth ferrite nanostructured material. We demonstrated bandgap tunability from 2.22 to 1.93 eV with an average crystallite size from 42 to 24.42 nm following the inverse quantum confinement effect dominated by the lattice strain. The degenerate d–d electronic transitions 6A1g4T1g and 6A1g4T2g from iron dominate in these nanoparticles. The decrease in the energy band gap and the corresponding red shift in the d–d charge transfer transition energies with reduced average crystallite size are attributed to the increased lattice strain and reduced unit cell volume.

Graphical abstract: Interband electronic transitions and optical phonon modes in size-dependent multiferroic BiFeO3 nanoparticles

Supplementary files

Article information

Article type
Paper
Submitted
30 oct. 2023
Accepted
27 feb. 2024
First published
12 mar. 2024

Phys. Chem. Chem. Phys., 2024,26, 9675-9686

Interband electronic transitions and optical phonon modes in size-dependent multiferroic BiFeO3 nanoparticles

P. Sahoo and A. Dixit, Phys. Chem. Chem. Phys., 2024, 26, 9675 DOI: 10.1039/D3CP05267B

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