Enhanced piezoelectric strain of BiFeO 3 –Ba(Zr 0.02 Ti 0.98 )O 3 lead‐free ceramics near the phase boundary
Enhanced piezoelectric strain of BiFeO 3 –Ba(Zr 0.02 Ti 0.98 )O 3 lead‐free ceramics near the phase boundary
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DOI：
10.1111/ijac.13380
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发表时间：
2020-05
影响因子：
2.1
通讯作者：
Jian Guo;Zhenhai Ning;Dongyan Fu;Jinrong Cheng;Jianguo Chen
中科院分区：
文献类型：
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作者：
Jian Guo;Zhenhai Ning;Dongyan Fu;Jinrong Cheng;Jianguo Chen
采用传统固相反应法制备了xBiFeO 3-（1-x）Ba（Zr0.02Ti0.98）O3+ 1.0mol%MnO2（xBF-BZT）无铅压电陶瓷。研究了其结构、介电和压电性能。X射线衍射（XRD）分析表明，xBF-BZT陶瓷为纯钙钛矿结构，四方相和菱方相共存（0.66 ≤x≤ 0.74）。0.7BF-0.3BZT-Mn陶瓷的居里温度Tc、介电常数εr（1 kHz）、介电损耗tanδ（1 kHz）、压电常数d33、矫顽场Ec（80 kV/cm）和剩余极化Pr（80 kV/cm）分别为491°C、633、0.044、165 pC/N、35.6 kV/cm和22.6 μC/cm 2。在60 kV/cm电场下，0.7BF-0.3BZT陶瓷的单极应变达到0.20%，比BiFeO 3-BaTiO 3陶瓷的0.15%大。这些结果表明，BF-BZT陶瓷是一种很有前途的高温压电材料。
ThexBiFeO3‐(1‐x)Ba(Zr0.02Ti0.98)O3+ 1.0 mol% MnO2(xBF‐BZT) lead‐free piezoelectric ceramics were prepared by conventional solid‐state reaction method. The structure, dielectric, and piezoelectric properties were studied. X‐ray diffraction (XRD) analysis showed thatxBF‐BZT ceramics exhibited pure perovskite structure with the coexistence of tetragonal and rhombohedral phases (0.66 ≤x≤ 0.74). The Curie temperatureTc, the dielectric constantεr(1 kHz), dielectric loss tanδ(1 kHz), piezoelectric constantd33, coercive fieldEc(80 kV/cm), and remnant polarizationPr(80 kV/cm) of 0.7BF‐0.3BZT‐Mn ceramics were 491°C, 633, 0.044, 165 pC/N, 35.6 kV/cm, and 22.6 μC/cm2, respectively. The unipolar strain of 0.7BF‐0.3BZT reached up to 0.20% under the electric field of 60 kV/cm, which is larger than that (0.15%) of BiFeO3–BaTiO3ceramics. These results indicated that thexBF‐BZT ceramics were promising candidates for high‐temperature piezoelectric materials.