High temperature dielectric, ferroelectric and piezoelectric properties of Mn-modified BiFeO₃-BaTiO₃ lead-free ceramics

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• 作者：Qiang Li ; Jianxin Wei ; Jinrong Cheng ; Jianguo Chen
• 刊名：Journal of Materials Science
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：52
• 期：1
• 页码：229-237
• 全文大小：2,450 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803
• 卷排序：52

文摘

Lead-free and high-temperature 0.71BiFeO₃-0.29BaTiO₃ ceramics with Mn modification (BF-BT-x %Mn) were fabricated by conventional solid-state reaction method, and the high temperature dielectric, ferroelectric and piezoelectric properties were investigated. All compositions exhibited pseudo-cubic phases. Mn modification improved the electrical properties of BF-BT solid solutions at both room and high temperature. The Curie temperature T_C, depolarization temperature T_d, dielectric constant ε_r, dielectric loss tanδ, piezoelectric constant d₃₃, electromechanical coupling factor k_p, remnant polarization P_r of BF-BT-1.2 %Mn ceramics were 506, 500 °C, 556, 0.04, 169 pC N−1, 0.373, 31.4 μC cm−2, respectively. The ε_r, tanδ, and k_p of BF-BT-1.2 %Mn ceramics were stable with the increase of temperature until 500 °C. The coercive field E_c of BF-BT-1.2 %Mn ceramics was nearly 30 kV cm−1 at 200 °C, which was much larger than those of PZT, BS-PT,BNT and KNN ceramics. The high field strain coefficient d*₃₃ reached as large as 525 pm V−1 at 200 °C. These results showed that the BF-BT-x %Mn ceramics were promising candidate for high temperature piezoelectric applications.