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<p>The effects of the processing technique on the properties of modified 0.99 Bi<sub>0.5</sub>(Na<sub>0.8</sub> K<sub>0.2</sub>)<sub>0.5</sub> TiO<sub>3</sub> − 0.01 Bi (Mg<sub>2/3</sub>Nb<sub>1/3</sub>) O<sub>3</sub> or BNKT-BMN-based ceramics were investigated. The ceramic samples were synthesized by two different techniques, a conventional solid-state technique (CS) and a two-step technique (2-Step). Both techniques yielded pure perovskite phases without any impurity phase. The 2-Step samples presented a finer grain with a higher density than the CS technique. The 2-Step technique also enhanced many electrical properties such as the dielectric constant (<i>ε</i><sub><i>r</i></sub>), energy density (<i>W</i><sub><i>rec</i></sub>), dielectric breakdown strength (<i>E</i><sub><i>b</i></sub>), electro-strain (<i>S</i>), normalized strain (<i>d</i><sub><i>33</i></sub>*), piezoelectric coefficient (<i>d</i><sub><i>33</i></sub>), piezoelectric voltage constant (<i>g</i><sub><i>33</i></sub>), and figure of merit (FoM). Mechanical properties such as hardness (<i>H</i>) and elastic modulus (<i>E</i>) were as well improved by this technique. However, the 2-Step technique promoted a higher heterogeneous conduction, resulting in a higher degree of loss tangent (<i>tanδ</i>)-frequency dispersion, while the observed <i>tanδ</i> values were still low. Therefore, the 2-Step technique positively affects the properties of the studied ceramics and may also positively impact other lead-free Bi-based piezoelectric ceramic systems.</p>

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Influence of the synthesis route on the electrical and mechanical properties of a modified 0.99 Bi0.5(Na0.8 K0.2)0.5 TiO3 − 0.01 Bi (Mg2/3Nb1/3) O3 lead-free ceramics

  • 期刊论文

  • 发表日期：

    2025年1月18日

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  • Lalita Tawee,
  • Narongdetch Boothrawong,
  • Jetsada Wadthanakul,
  • Chamnan Randorn,
  • Gobwute Rujijanagul

摘要

The effects of the processing technique on the properties of modified 0.99 Bi0.5(Na0.8 K0.2)0.5 TiO3 − 0.01 Bi (Mg2/3Nb1/3) O3 or BNKT-BMN-based ceramics were investigated. The ceramic samples were synthesized by two different techniques, a conventional solid-state technique (CS) and a two-step technique (2-Step). Both techniques yielded pure perovskite phases without any impurity phase. The 2-Step samples presented a finer grain with a higher density than the CS technique. The 2-Step technique also enhanced many electrical properties such as the dielectric constant (εr), energy density (Wrec), dielectric breakdown strength (Eb), electro-strain (S), normalized strain (d33*), piezoelectric coefficient (d33), piezoelectric voltage constant (g33), and figure of merit (FoM). Mechanical properties such as hardness (H) and elastic modulus (E) were as well improved by this technique. However, the 2-Step technique promoted a higher heterogeneous conduction, resulting in a higher degree of loss tangent (tanδ)-frequency dispersion, while the observed tanδ values were still low. Therefore, the 2-Step technique positively affects the properties of the studied ceramics and may also positively impact other lead-free Bi-based piezoelectric ceramic systems.