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<p>The tape casting combined with lamination process was developed to prepare dense (K, Na)NbO<sub>3</sub> ceramics without any sintering additives by alignment of columnar NaNbO<sub>3</sub> template in a matrix of K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> powder. A phase separation phenomenon was observed in matrix due to the induction of template epitaxial growth. The effects of template layer content on densification process and electric properties of the (K, Na) NbO<sub>3</sub> ceramics were investigated in detail. It was found that the relative density increased with the increase of template content. Multiple peaks appeared in the dielectric temperature spectrum and Curie temperatures of the (K, Na) NbO<sub>3</sub> ceramics increased from 306 ℃ to 343 ℃ with the decrease of template content. The high piezoelectric constant (165 pC/N) and remanent polarization (22 µC/cm<sup>2</sup>) could mainly attributed to the response of interface polarization between K-rich and other phases. This work provides a new way for the preparation of high-performance piezoelectric ceramics by inducing heterogeneous interface.</p>

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Phase separation phenomenon and densification process in (K, Na)NbO3 ceramics indued by microcrystalline template

  • 期刊论文

  • 发表日期：

    2025年9月17日

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  • Qiang Zhang,
  • Liangliang Liu,
  • Yan Wang,
  • Zezheng Yan,
  • Zhaoping Hou

摘要

The tape casting combined with lamination process was developed to prepare dense (K, Na)NbO3 ceramics without any sintering additives by alignment of columnar NaNbO3 template in a matrix of K0.5Na0.5NbO3 powder. A phase separation phenomenon was observed in matrix due to the induction of template epitaxial growth. The effects of template layer content on densification process and electric properties of the (K, Na) NbO3 ceramics were investigated in detail. It was found that the relative density increased with the increase of template content. Multiple peaks appeared in the dielectric temperature spectrum and Curie temperatures of the (K, Na) NbO3 ceramics increased from 306 ℃ to 343 ℃ with the decrease of template content. The high piezoelectric constant (165 pC/N) and remanent polarization (22 µC/cm2) could mainly attributed to the response of interface polarization between K-rich and other phases. This work provides a new way for the preparation of high-performance piezoelectric ceramics by inducing heterogeneous interface.