Quantum Beam Science (Sep 2023)

Effect of Oxygen Annealing Atmosphere on Structural, Electrical and Energy Storage Properties of Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub> Polycrystalline Thin Film

  • Ilham Hamdi Alaoui,
  • Nathalie Lemée,
  • Françoise Le Marrec,
  • Moussa Mebarki,
  • Anna Cantaluppi,
  • Delphine Favry,
  • Abdelilah Lahmar

DOI
https://doi.org/10.3390/qubs7030029
Journal volume & issue
Vol. 7, no. 3
p. 29

Abstract

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Bismuth sodium titanate (BNT) thin films were deposited on Pt/SiN substrates by Sol-Gel spin coating technique and annealed under O2 atmosphere. The microstructural, structural, and electrical properties of the obtained film were investigated. Electron microscopy scans and atomic force microscopy micrographs were used to analyze the microstructure of the films. Furthermore, energy-dispersive X-ray spectroscopy (EDX) analysis revealed a Na-deficient composition for the obtained film. X-ray diffraction and Raman spectroscopy allowed the identification of a pure perovskite BNT phase. Dielectric, ferroelectric, and leakage current measurements revealed good frequency stability of the dielectric constant and dielectric losses for BNT thin film. The results are discussed in terms of Na deficiency effects on the defect structure of BNT. Further, the film showed attractive electrostatic energy storage properties with energy density that exceeds 1.04 J/cm3 under E = 630 kV/cm.

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