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Enhanced Ferroelectric and Dielectric Properties of Niobium-Doped Lead-Free Piezoceramics.
- Source :
-
Materials (Basel, Switzerland) [Materials (Basel)] 2023 Jan 04; Vol. 16 (2). Date of Electronic Publication: 2023 Jan 04. - Publication Year :
- 2023
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Abstract
- Lead-free ceramics are promising candidates for replacing lead-based piezoelectric materials such as lead-zirconate-titanate (PZT) if they can compete in dielectric and ferroelectric characteristics. In this work, for lead-free piezoelectric ceramic, 0.74(Bi <subscript>0.5</subscript> Na <subscript>0.5</subscript> TiO <subscript>3</subscript> )-0.26(SrTiO <subscript>3</subscript> ) (BNT-ST26) and niobium-substituted (Nb-BNT-ST26) ceramics were synthesized by solid-state reactions. The evolution of niobium substitution to the perovskite phase structure of BNT-ST26 ceramics was confirmed by X-ray diffraction (XRD) analysis and Raman spectra. Electromechanical properties of Nb-BNT-ST26 ceramics initially increased with the addition of niobium up to 0.5% and decreased with a further increase in Nb content. Temperature-dependent dielectric curves showed that the depolarization temperature (T <subscript>d</subscript> ) decreased below room temperature because of Nb substitution. The composition with 0.5% Nb yielded a maximum bipolar strain (S <subscript>max</subscript> ) of 0.265% and normalized strain of d <subscript>33</subscript> * ~ 576 pm/V under an electric field of 4.6 kV/mm at room temperature. At this critical concentration of 0.5% Nb, maximum saturation polarization of 26 μC/cm <superscript>2</superscript> was achieved. The dielectric constant with temperature peaks became more diffused and the depolarization temperature decreased with the increasing Nb content. The study concludes that Nb-doped BNT-ST26 is an excellent material for high-temperature, stable, frequency-dependent, lead-free piezoelectric devices.
Details
- Language :
- English
- ISSN :
- 1996-1944
- Volume :
- 16
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Materials (Basel, Switzerland)
- Publication Type :
- Academic Journal
- Accession number :
- 36676219
- Full Text :
- https://doi.org/10.3390/ma16020477