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<p>Ternary piezoelectric ceramics Pb[(Fe<sub>1/3</sub>Sb<sub>2/3</sub>)<sub><i>x</i></sub>Ti<sub><i>y</i></sub>Zr<sub><i>z</i></sub>]O<sub>3</sub> (PFS system) with <i>x</i> = 0.1 and <i>y</i> = 0.43–0.48, where <i>x</i> + <i>y</i> + <i>z</i> = 1, were prepared using the conventional mixed-oxide method. The effects of the Zr/Ti ratio on the structure, microstructure, electromechanical, and electrocaloric properties were systematically investigated. Increasing the Ti/Zr ratio promotes the transformation of the phase structure from rhombohedral to tetragonal, indicating the presence of a morphotropic phase boundary (MPB) in the PFS system. In this system, the MPB is inferred to lie within the composition range of 0.43 ≤ <i>y</i> ≤ 0.48 based on qualitative analysis of peak splitting. Microstructural observations reveal that Zr-rich samples tend to exhibit larger grains and lower porosity compared to Ti-rich counterparts, suggesting that microstructural features may influence the observed functional behavior. The dielectric permittivity and phase transition temperature depend on composition. Dielectric measurements display typical diffuse phase transitions, and piezoelectric characterization confirms the beneficial effects of the MPB structures on electromechanical coupling. Comparison with existing literature indicates that these PZT compositions demonstrate competitive electrocaloric performance, particularly under moderate electric fields. These results demonstrate the potential for optimizing PZT-based materials for applications such as solid-state cooling technologies, while also highlighting areas that require further exploration, such as the interplay between microstructure and functional properties.</p>

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Role of Zr/Ti ratio in modulating PZT properties near the MPB with stable dopant levels

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月7日

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  • Magdalena Krupska-Klimczak,
  • Sobhan Mohammadi Fathabad,
  • Vladimir V. Shvartsman,
  • Doru C. Lupascu,
  • Irena Jankowska-Sumara

摘要

Ternary piezoelectric ceramics Pb[(Fe1/3Sb2/3)xTiyZrz]O3 (PFS system) with x = 0.1 and y = 0.43–0.48, where x + y + z = 1, were prepared using the conventional mixed-oxide method. The effects of the Zr/Ti ratio on the structure, microstructure, electromechanical, and electrocaloric properties were systematically investigated. Increasing the Ti/Zr ratio promotes the transformation of the phase structure from rhombohedral to tetragonal, indicating the presence of a morphotropic phase boundary (MPB) in the PFS system. In this system, the MPB is inferred to lie within the composition range of 0.43 ≤ y ≤ 0.48 based on qualitative analysis of peak splitting. Microstructural observations reveal that Zr-rich samples tend to exhibit larger grains and lower porosity compared to Ti-rich counterparts, suggesting that microstructural features may influence the observed functional behavior. The dielectric permittivity and phase transition temperature depend on composition. Dielectric measurements display typical diffuse phase transitions, and piezoelectric characterization confirms the beneficial effects of the MPB structures on electromechanical coupling. Comparison with existing literature indicates that these PZT compositions demonstrate competitive electrocaloric performance, particularly under moderate electric fields. These results demonstrate the potential for optimizing PZT-based materials for applications such as solid-state cooling technologies, while also highlighting areas that require further exploration, such as the interplay between microstructure and functional properties.