Enhanced insulation and piezoelectric properties of 0.57(Bi0.8La0.2)FeO3‐0.43PbTiO3 solid solutions with Fe addition
Enhanced insulation and piezoelectric properties of 0.57(Bi0.8La0.2)FeO3‐0.43PbTiO3 solid solutions with Fe addition
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添加Fe增强0.57(Bi0.8La0.2)FeO3—0.43PbTiO3固溶体的绝缘和压电性能
DOI：
10.1111/jace.18613
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发表时间：
2022
影响因子：
3.9
通讯作者：
Jinrong Cheng
中科院分区：
文献类型：
--
作者：
Yongchen Wang;Fanhao Jia;Zhixiang Jiao;Jie Jian;Jianguo Chen;Yan Wang;Jinrong Cheng
用传统的固相反应法制备了0.57(Bi0.8La0.2)FeO3‐0.43PbTiO3‐xmol%Fe2O3ceramics(BLf-PT-xFe，x=0.025，0.5，0.125，0.25)。X射线衍射分析表明，所有样品均为四方(T)相和三方相(R)相共存的钙钛矿结构，而Fe的加入促进了从T相到R相的相变。扫描电子显微镜(SEM)照片显示，所有样品都结晶良好，且随着Fe含量的增加，其晶粒尺寸显著增大。X射线光电子能谱(XPS)结果表明，Fe掺杂显著抑制了氧空位的形成，从而改善了BLF-PT-xFe陶瓷的绝缘性能。有趣的是，BLF-PT-XFe的居里温度在330℃左右，几乎不随Fe含量的变化而变化。然而，掺Fe的BLF-PT陶瓷的退极化温度比未掺Fe的样品高50℃。在2 0 0°C-5 0 0°C温度范围内，二次电离氧空位跃迁是主要的载流子。BLFPT-xFe陶瓷的最佳组份为ATx=0.0 5，此时的介电损耗tanδ为0.015，交流电阻率为2 0 0°C，压电系数为2 4 5pC/N，介电损耗为0.015Ω/cm。所有这些结果表明，Fe的添加是提高介电和压电性能的有效方法。
0.57(Bi0.8La0.2)FeO3‐0.43PbTiO3‐xmol%Fe2O3ceramics (BLF‐PT‐xFe,x= 0, 0.025, 0.05, 0.125, and 0.25) were prepared by the conventional solid‐state reaction method. X‐ray diffraction (XRD) reveals that all samples display the perovskite structure with a coexistence of tetragonal (T) phase and rhombohedral (R) phase, while the incorporation of Fe promotes the phase transition from T to R. Scanning electron microscopy (SEM) images show that all samples are well crystallized and their grain size increases noticeably with the increase of Fe content. X‐ray photoelectron spectroscopy (XPS) results indicate that Fe doping significantly inhibits the formation of oxygen vacancies, thereby improving insulation of BLF‐PT‐xFe ceramics. Interestingly, the Curie temperature of BLF‐PT‐xFe is around 330°C, little changing with the variation of Fe content. However, the depolarization temperatures of BLF‐PT ceramics with Fe are 50°C higher than that of the sample without Fe doping. The hopping of second ionized oxygen vacancies are the major carriers in the temperature range of 200°C–500°C. The optimal component of BLF‐PT‐xFe ceramics appear atx= 0.05, where the dielectric loss tanδ, AC resistivity (200°C), and piezoelectric coefficientd33could be 0.015, 7 × 106Ω cm, and 245 pC/N, respectively. All these results indicate that the Fe addition is an effective method to enhance dielectric and piezoelectric properties.