Lead-free rare earth-modified BiFeO3 ceramics: Phase structure and electrical properties
Lead-free rare earth-modified BiFeO3 ceramics: Phase structure and electrical properties
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DOI：
10.1016/j.matdes.2017.01.083
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发表时间：
2017-04
影响因子：
8.4
通讯作者：
Hong Tao;Jing Lv;Ran Zhang;R. Xiang;Jiagang Wu
中科院分区：
文献类型：
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作者：
Hong Tao;Jing Lv;Ran Zhang;R. Xiang;Jiagang Wu
本文研究了稀土掺杂BFO陶瓷的相演变以及相结构与电性能的关系，Eu，Pr，Sm，La，Dy）。结果表明，稀土元素的种类和含量对陶瓷的相结构有很大的影响：Eu、Pr和La（x ≤ 0.10）为菱方相，Dy（x ≤ 0.15）为菱方相，Sm（x ≤ 0.075）为正交相，Eu（0.15 <x≤ 0.30）为正交相，Sm和Dy（0.20 <x≤ 0.30）为正交相; 0.20 <x≤ 0.30的Pr和0.10 <x≤ 0.20的La为三斜晶系，0.20 <x≤ 0.30的La为单斜晶系，0.10 <x≤ 0.15的Eu、0.10 <x≤ 0.20的Pr和0.15 <x≤ 0.20的Dy为斜方晶系。有趣的是，相对于多相共存或其他相的陶瓷，具有菱方相的陶瓷总是表现出更好的压电和铁电性能。此外，添加稀土元素（Eu，Pr，Sm，La）的陶瓷具有较高的压电常数（d33> 40 pC/N）和较低的介电损耗（tanδ≤ 0.01）。
Here we investigated the phase evolutions as well as the relationships between phase structure and electrical properties of BFO ceramics by doping rare earth elements (i.e., Eu, Pr, Sm, La, Dy) with different concentrations. It was found that the phase structure of the ceramics was strongly dependent on the types and concentrations of rare earth elements: rhombohedral phase for Eu, Pr and La withx≤ 0.10, Dy withx≤ 0.15, Sm withx≤ 0.075; orthorhombic for Eu with 0.15 <x≤ 0.30, and Sm and Dy with 0.20 <x≤ 0.30; triclinic phase for Pr with 0.20 <x≤ 0.30, and La with 0.10 <x≤ 0.20; monoclinic for La with 0.20 <x≤ 0.30; rhombohedral-orthorhombic for Eu with 0.10 <x≤ 0.15, Pr with 0.10 <x≤ 0.20, and Dy with 0.15 <x≤ 0.20. Interestingly, the ceramics with rhombohedral phase always exhibited better piezoelectric and ferroelectric properties with respect to the ones with multiphase coexistence or other phases. In addition, both high piezoelectric constant (d33> 40 pC/N) and low dielectric loss (tanδ≤ 0.01) can be achieved in the ceramics with rare earth elements (Eu, Pr, Sm, La).