Reduced dielectric loss and enhanced piezoelectric properties of Mn modified 0.71BiFeO3–0.29BaTiO3 ceramics sintered under oxygen atmosphere
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- 作者：Qiang Li ; Jinrong Cheng ; Jianguo Chen
- 刊名：Journal of Materials Science: Materials in Electronics
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：28
- 期：2
- 页码：1370-1377
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials;
- 出版者：Springer US
- ISSN：1573-482X
- 卷排序：28
文摘
0.71BiFeO3–0.29BaTiO3 piezoelectric ceramics with Mn modification (BF–BT–lic ">x %Mn) sintered in air and O2 atmospheres have been investigated to understand the effects of sintering atmosphere on structure, dielectric, ferroelectric and piezoelectric properties. All ceramics exhibited the pseudo-cubic phase, while the O2 sintered ceramics possessed larger grain sizes and more homogeneous distribution. Dielectric, ferroelectric and piezoelectric properties of BF–BT–lic ">xMn ceramics were improved obviously after O2 atmospheres sintering, especially for the compositions with Mn contents less than 1.2 mol%. The evidence of impedance spectroscopy indicated that the concentration of oxygen vacancies decreased significantly by the introduction of O2 atmosphere. The dielectric loss tanδ was decreased down to 1/2 and the resistivity ρ enhanced 11 times for BF–BT–0 %Mn ceramics by the introduction of O2 atmosphere. The strains of BF–BT–0.5 %Mn increased from 0.09 to 0.22 and the d33* increased from 119 to 284 pm/V after sintering in O2 atmosphere. The Curie temperature and piezoelectric constant of O2 sintered BF–BT–1.2 %Mn reached up to 500 °C and 353 pm/V, respectively. This work suggests that sintering in the O2 oxygen atmosphere is an effective way to improve the dielectric and piezoelectric properties of BiFeO3–BaTiO3 solid solutions.