Scholarlink

<p>This study aims to investigate and compare the structural, microstructural, dielectric, and ferroelectric properties of lead-free sintered K<sub>0.3</sub>Na<sub>0.7</sub>NbO<sub>3</sub> piezoceramics formed by cold-isostatic pressing (CIP) and single-axis pressing (SAP) methods. XRD data revealed the simultaneous presence of tetragonal (94%) and orthorhombic (6%) symmetries in the CIP sample, while the coexistence of monoclinic (74%) and orthorhombic (26%) crystal systems was observed in the SAP ceramic. Based on FESEM images, cube-shaped grains (~ 3.5&#xa0;μm) were observed in the CIP sample with a relatively narrow distribution. Also, the SAP sample exhibited larger cuboid grains (~ 4.2&#xa0;μm) with a broader distribution. Moreover, the dielectric constant of the CIP sample was about 30% larger than that of the SAP’s. In addition, the higher ferroelectric properties (saturation polarization (<i>P</i><sub><i>s</i></sub>) ~ 27.5 µC/cm<sup>2</sup> and remnant polarization (<i>P</i><sub><i>r</i></sub>) ~ 22.9 µC/cm<sup>2</sup>) were obtained for the CIP sample in comparison to the SAP ceramic (<i>P</i><sub><i>s</i></sub> ~ 24.8 µC/cm<sup>2</sup> and <i>P</i><sub><i>r</i></sub> ~ 20.2 µC/cm<sup>2</sup>).</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

From phase coexistence to ferroelectric enhancement: a comparative study of pressing techniques in K0.3Na0.7NbO3 ceramics

  • 期刊论文

  • 发表日期：

    2026年4月10日

查看全文
  • Pouriya Kasaeipoor Naeini,
  • Ali Soleimani,
  • Afsar Norozian,
  • Touradj Ebadzadeh,
  • Aref Ahmadian Baghbadarani

摘要

This study aims to investigate and compare the structural, microstructural, dielectric, and ferroelectric properties of lead-free sintered K0.3Na0.7NbO3 piezoceramics formed by cold-isostatic pressing (CIP) and single-axis pressing (SAP) methods. XRD data revealed the simultaneous presence of tetragonal (94%) and orthorhombic (6%) symmetries in the CIP sample, while the coexistence of monoclinic (74%) and orthorhombic (26%) crystal systems was observed in the SAP ceramic. Based on FESEM images, cube-shaped grains (~ 3.5 μm) were observed in the CIP sample with a relatively narrow distribution. Also, the SAP sample exhibited larger cuboid grains (~ 4.2 μm) with a broader distribution. Moreover, the dielectric constant of the CIP sample was about 30% larger than that of the SAP’s. In addition, the higher ferroelectric properties (saturation polarization (Ps) ~ 27.5 µC/cm2 and remnant polarization (Pr) ~ 22.9 µC/cm2) were obtained for the CIP sample in comparison to the SAP ceramic (Ps ~ 24.8 µC/cm2 and Pr ~ 20.2 µC/cm2).