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<p>(1-x)Bi<sub>0.5</sub>(Na<sub>0.77</sub>K<sub>0.20</sub>Li<sub>0.03</sub>)<sub>0.5</sub>TiO<sub>3</sub>-xBi<sub>0.8</sub>Ba<sub>0.2</sub>FeO<sub>3</sub> ((1-x)BNKLT-xBBF) ceramics with x = 0-0.4 were synthesized by the solid-state combustion technique. X-ray diffraction (XRD) analysis confirmed a pure perovskite structure with coexisting rhombohedral and tetragonal phases. Rietveld refinement revealed that the unit cell volume increased with increased x due to the substitution of smaller Bi<sup>3+</sup> and Ti<sup>4+</sup> ions by larger Ba<sup>2+</sup> and Fe<sup>3+</sup> ions at the A- and B-sites, respectively. The average grain size and measured density also increased with increasing x, while the resistivity decreased. At room temperature, (1-x)BNKLT-xBBF ceramics with x = 0.2–0.4 exhibited multiferroic behavior, characterized by ferroelectric and ferromagnetic hysteresis loops. The 0.8BNKLT-0.2BBF ceramic exhibited the most favorable properties, including: the highest relative density (95.48%), the highest dielectric constant and low dielectric loss at room temperature (ε<sub>R</sub> = 1746 and tan δ<sub>R</sub> = 0.0296), good ferroelectric properties (P<sub>r</sub>=6.46 µC/cm<sup>2</sup> and E<sub>c</sub>=11.84&#xa0;kV/cm) and good ferromagnetic properties (M<sub>r</sub>=0.002 emu/g, H<sub>c</sub>=110 Oe and α<sub>E</sub> = 1.092 mV/Oe·cm). These results indicate that 0.8BNKLT-0.2BBF has the potential for applications in lead-free, room temperature multiferroic applications.</p>

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Optimal Bi₀.₈Ba₀.₂FeO₃ doping in Bi₀.₅(Na₀.₇₇K₀.₂₀Li₀.₀₃)₀.₅TiO₃ multiferroic ceramics synthesized by the solid-state combustion technique

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  • 发表日期：

    2025年7月2日

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  • Pichittra Thawong,
  • Sasipohn Prasertpalichat,
  • Tawat Suriwong,
  • Supree Pinitsoontorn,
  • Pongsakorn Jantaratana,
  • Suphornphun Chootin,
  • Manlika Sriondee,
  • Thitirat Charoonsuk,
  • Naratip Vittayakorn,
  • Aurawan Rittidech,
  • Theerachai Bongkarn

摘要

(1-x)Bi0.5(Na0.77K0.20Li0.03)0.5TiO3-xBi0.8Ba0.2FeO3 ((1-x)BNKLT-xBBF) ceramics with x = 0-0.4 were synthesized by the solid-state combustion technique. X-ray diffraction (XRD) analysis confirmed a pure perovskite structure with coexisting rhombohedral and tetragonal phases. Rietveld refinement revealed that the unit cell volume increased with increased x due to the substitution of smaller Bi3+ and Ti4+ ions by larger Ba2+ and Fe3+ ions at the A- and B-sites, respectively. The average grain size and measured density also increased with increasing x, while the resistivity decreased. At room temperature, (1-x)BNKLT-xBBF ceramics with x = 0.2–0.4 exhibited multiferroic behavior, characterized by ferroelectric and ferromagnetic hysteresis loops. The 0.8BNKLT-0.2BBF ceramic exhibited the most favorable properties, including: the highest relative density (95.48%), the highest dielectric constant and low dielectric loss at room temperature (εR = 1746 and tan δR = 0.0296), good ferroelectric properties (Pr=6.46 µC/cm2 and Ec=11.84 kV/cm) and good ferromagnetic properties (Mr=0.002 emu/g, Hc=110 Oe and αE = 1.092 mV/Oe·cm). These results indicate that 0.8BNKLT-0.2BBF has the potential for applications in lead-free, room temperature multiferroic applications.