High temperature dielectric, ferroelectric and piezoelectric properties of Mn-modified BiFeO<sub class="a-plus-plus">3sub>-BaTiO<sub class="a-plus-plus">3sub> 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 0.71BiFeO<sub>3sub>-0.29BaTiO<sub>3sub> 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<sub>Csub>, depolarization temperature T<sub>dsub>, dielectric constant ε<sub>rsub>, dielectric loss tanδ, piezoelectric constant d<sub>33sub>, electromechanical coupling factor k<sub>psub>, remnant polarization P<sub>rsub> 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<sub>rsub>, tanδ, and k<sub>psub> of BF-BT-1.2 %Mn ceramics were stable with the increase of temperature until 500 °C. The coercive field E<sub>csub> 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*<sub>33sub> 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.