Tunable Optical Properties and Relaxor Behavior in Ni/Ba Co-Doped NaNbO<sub>3</sub> Ceramics: Pathways Toward Multifunctional Applications

Tunable Optical Properties and Relaxor Behavior in Ni/Ba Co-Doped NaNbO<sub>3</sub> Ceramics: Pathways Toward Multifunctional Applications

In this study, Ni/Ba co-doped NaNbO<sub>3</sub> ceramics (NBNNO<sub>x</sub>) were synthesized using a solid-state method to explore the effects of Ni<sup>2+</sup> and Ba<sup>2+</sup> ion substitution on the structural, optical, and dielectric propertie...

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Bibliographic Details
Main Authors: Tawfik Chaabeni, Zohra Benzarti, Najmeddine Abdelmoula, Slim Zghal
Format: Article
Language:English
Published: MDPI AG 2024-11-01
Series:Ceramics
Subjects:
Ni/Ba co-doped NaNbO<sub>3</sub> ceramics
solid–solid method
structural distortions
band gap tunability
relaxor behavior
multifunctional applications
Online Access:https://www.mdpi.com/2571-6131/7/4/107
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Summary:In this study, Ni/Ba co-doped NaNbO<sub>3</sub> ceramics (NBNNO<sub>x</sub>) were synthesized using a solid-state method to explore the effects of Ni<sup>2+</sup> and Ba<sup>2+</sup> ion substitution on the structural, optical, and dielectric properties of NaNbO<sub>3</sub>. X-ray diffraction (XRD) confirmed that the ceramics retained an orthorhombic structure, with crystallinity improving as the doping content (x) increased. Significant lattice distortions induced by the Ni/Ba co-doping were observed, which were essential for preserving the perovskite structure. Raman spectroscopy revealed local structural distortions, influencing optical properties and promoting relaxor behavior. Diffuse reflectance measurements revealed a significant decrease in band gap energy from 3.34 eV for undoped NaNbO<sub>3</sub> to 1.08 eV at x = 0.15, highlighting the impact of co-doping on band gap tunability. Dielectric measurements indicated relaxor-like behavior at room temperature for x = 0.15, characterized by frequency-dependent anomalies in permittivity and dielectric loss, likely due to ionic disorder and structural distortions. These findings demonstrate the potential of Ni/Ba co-doped NaNbO<sub>3</sub> ceramics for lead-free perovskite solar cells and other functional devices, where tunable optical and dielectric properties are highly desirable.
ISSN:2571-6131

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