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<p>Ba<sub>0.85</sub>Ca<sub>0.15</sub>Hf<sub>0.1</sub>Ti<sub>0.9</sub>O<sub>3</sub>+<i>x</i> mol% Y<sub>2</sub>O<sub>3</sub> (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(x\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>x</mi> </math></EquationSource> </InlineEquation> = 0.02–0.6) lead-free piezoelectric ceramics were fabricated via a conventional solid state reaction route, and their phase structures, grain size, dielectric, ferroelectric and piezoelectric properties were investigated. The ferroelectricity and multiphase coexistence concerning rhombohedral−orthorhombic−tetragonal (R−O−T) phases of all the ceramics were observed at room temperature; Low Y<sub>2</sub>O<sub>3</sub> doping can lead to an increase of averagegrain size, while the excessive reduces it. The ceramics have the highest piezoelectric coefficient (<i>d</i><sub>33</sub>) and Curie temperature (<i>T</i><sub>C</sub>) at <i>x</i> = 0.1, and the values are 469 <i>pC/N</i> and 101.7&#xa0;°C, respectively. And the maximum values of dielectric peak (<i>ɛ</i><sub>max</sub>) and electromechanical coupling coefficient (<i>k</i><sub>p</sub> )were also found for the ceramic, reaching 13,233 and 46%, respectively. The superior electrical performance is primarily attributed to its large and uniform grain size distribution, rendering it a promising candidate for applications in sensor technology and energy-efficient memory devices, etc.</p>

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Study on the microstructures and electrical properties of Y2O3 doped Ba0.85Ca0.15Hf0.1Ti0.9O3 lead-free piezoelectric ceramics

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Haibo Cui,
  • Wenjun Xu,
  • Xuejun Guan,
  • Jiayu Cui,
  • Hongmei Yin,
  • Hengwei Zhou,
  • Yineng Huang

摘要

Ba0.85Ca0.15Hf0.1Ti0.9O3+x mol% Y2O3 ( \(x\) x = 0.02–0.6) lead-free piezoelectric ceramics were fabricated via a conventional solid state reaction route, and their phase structures, grain size, dielectric, ferroelectric and piezoelectric properties were investigated. The ferroelectricity and multiphase coexistence concerning rhombohedral−orthorhombic−tetragonal (R−O−T) phases of all the ceramics were observed at room temperature; Low Y2O3 doping can lead to an increase of averagegrain size, while the excessive reduces it. The ceramics have the highest piezoelectric coefficient (d33) and Curie temperature (TC) at x = 0.1, and the values are 469 pC/N and 101.7 °C, respectively. And the maximum values of dielectric peak (ɛmax) and electromechanical coupling coefficient (kp )were also found for the ceramic, reaching 13,233 and 46%, respectively. The superior electrical performance is primarily attributed to its large and uniform grain size distribution, rendering it a promising candidate for applications in sensor technology and energy-efficient memory devices, etc.