Enhanced energy-storage performance and electric-field-induced strain in Ta-doped (Bi\(_{0.465}\)Na\(_{0.465}\)Ba\(_{0.07}\))TiO\(_{3}\) lead-free ceramics

Pathit  PREMWICHIT; Theerawat  LUNTHAIYO; Onthida  KOSASANG; Sasipohn  PRASERTPALICHAT

doi:10.55713/jmmm.v36i4.2685

ผู้แต่ง

Pathit PREMWICHIT Department of Physics, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand
Theerawat LUNTHAIYO Department of Physics, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand
Onthida KOSASANG Center of Innovative Materials for Sustainability (iMatS), School of Science, Mae Fah Luang University, Thailand
Sasipohn PRASERTPALICHAT Department of Physics, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand; Research Center for Academic Excellence in Applied Physics, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand

DOI:

https://doi.org/10.55713/jmmm.v36i4.2685

คำสำคัญ:

Environmentally friendly ceramics, Ta substitution, Energy-storage capability, Relaxor behavior

บทคัดย่อ

The influence of Ta⁵⁺ substitution on lead-free (Bi_0.465Na_0.465Ba_0.07)Ta_xTi_(1–x)O₃ (BNBT–xTa, x = 0.0 to 0.03) ceramics was investigated. The samples were prepared using a conventional solid-state route, resulting in a phase-pure perovskite structure with pseudocubic characteristics for all compositions. With increasing Ta content, the electrical response gradually shifted toward relaxor behavior, as indicated by slimmer P–E loops, reduced remanent polarization, and a shift of T_s toward lower temperatures. This transition was also reflected in the strain characteristics, where S–E loops evolved from typical butterfly shapes to sprout-like profiles. The sample with x = 0.01 showed the best strain performance, reaching ~0.23% strain along with a normalized coefficient of ~383 pm·V^‒1. Energy-storage performance was significantly improved, with a maximum W_rec of ~0.90 J·cm^‒3 for x = 0.02, while efficiency further increased to 68% for x = 0.03. In parallel, electrical resistivity increased by nearly an order of magnitude, accompanied by a rise in activation energy from 1.53 eV to 1.71 eV, suggesting suppressed charge transport due to enhanced energy barriers. Overall, Ta⁵⁺ substitution effectively tailors both electrical and electromechanical properties, making BNBT-based ceramics promising candidates for advanced lead-free capacitor applications and actuators.

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