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<p>The increasing demand for higher operating speeds and greater integration densities in electronic devices has made heat dissipation one of the most critical challenges for next-generation technologies. This challenge has driven extensive efforts aimed at achieving a giant electrocaloric effect in ferroelectrics for high-efficiency cooling. Here, we propose a defect dipole engineering strategy to manipulate the polarization behavior of ferroelectric ceramics, leading to superior electrocaloric effect. By incorporating Sm and Li ions, the (Sm<sub>Ba</sub>̇-Li<sub>Ba</sub>ʹ) defect dipoles enhance the polarizability of BaTiO<sub>3</sub>. Simultaneously, these dipole defects increase the carrier activation energy, effectively mitigating the inherent trade-off between high breakdown strength and high polarization, thereby allowing the application of a high electric field to fully activate the electrocaloric potential. As a result, defect dipole engineering enables BaTiO<sub>3</sub> to achieve a remarkable electrocaloric effect over a wide temperature range, achieving a high temperature change of 2.7 K at 70 °C— typical for integrated circuits.</p>

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Enhanced electrocaloric effect in ferroelectric ceramics via defect dipole engineering

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月7日

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  • Wenrong Xiao,
  • Yao Wu,
  • Yilong Liu,
  • Bin Yang,
  • Zihao Zheng,
  • Xingjian Zou,
  • Xuetian Gong,
  • Fangyuan Luo,
  • Lulu Liu,
  • Xu Wang,
  • Shenglin Jiang,
  • Junning Li,
  • Kanghua Li,
  • Shi Liu,
  • Jinming Guo,
  • Wen Dong,
  • Shujun Zhang,
  • Guangzu Zhang

摘要

The increasing demand for higher operating speeds and greater integration densities in electronic devices has made heat dissipation one of the most critical challenges for next-generation technologies. This challenge has driven extensive efforts aimed at achieving a giant electrocaloric effect in ferroelectrics for high-efficiency cooling. Here, we propose a defect dipole engineering strategy to manipulate the polarization behavior of ferroelectric ceramics, leading to superior electrocaloric effect. By incorporating Sm and Li ions, the (SmBȧ-LiBaʹ) defect dipoles enhance the polarizability of BaTiO3. Simultaneously, these dipole defects increase the carrier activation energy, effectively mitigating the inherent trade-off between high breakdown strength and high polarization, thereby allowing the application of a high electric field to fully activate the electrocaloric potential. As a result, defect dipole engineering enables BaTiO3 to achieve a remarkable electrocaloric effect over a wide temperature range, achieving a high temperature change of 2.7 K at 70 °C— typical for integrated circuits.