Correlation between the grain size and phase structure, electrical properties in BiScO3-PbTiO3-based piezoelectric ceramics
Correlation between the grain size and phase structure, electrical properties in BiScO3-PbTiO3-based piezoelectric ceramics
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DOI：
10.1111/jace.17174
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发表时间：
2020-06-04
影响因子：
3.9
通讯作者：
Dong, Xianlin
中科院分区：
文献类型：
--
作者：
Dong, Yazhu;Zhou, Zhiyong;Dong, Xianlin
BiScO 3-PbTiO 3（BS-PT）基陶瓷是最有希望的高温压电传感器之一，通常通过端元取代来改变其相结构和电学性能。本文采用固相反应法在1100 ~ 1180 ℃的不同烧结温度下制备了成分为0.98（0.36BiScO（3）-0.64PbTiO（3））-0.02Bi（Sn_（1/3）Nb_（2/3））O_（3））的不同晶粒尺寸（1.4-3.7 μ m）的BS-PT基压电陶瓷。X射线衍射结果表明，随着烧结温度的升高，四方相含量从68.9%增加到85.7%。透射电子显微镜表征表明，微观形貌和畴形态是敏感的晶粒尺寸。烧结温度对材料的介电和铁电性能影响不大，当烧结温度为1120 ℃时，材料的最佳压电常数d（33）为450 pC/N，这可能是由于材料中菱形相和四面体相共存，以及纳米畴和亚尺寸条状畴共存的缘故.所有结果不仅为提高压电陶瓷的d（33）打开了新的窗口，而且有助于进一步了解压电陶瓷的微观结构与性能关系。
As one of the most promising candidates of high-temperature piezoelectric sensors, BiScO3-PbTiO3 (BS-PT)-based ceramics are commonly modified by end-member substitution to modify the phase structures and electrical properties. In this work, BS-PT-based piezoelectric ceramics with various grain sizes (1.4-3.7 mu m) of the composition 0.98(0.36BiScO(3)-0.64PbTiO(3))-0.02Bi(Sn1/3Nb2/3)O-3 were prepared by conventional solid-state reaction method at different sintering temperatures from 1100celcius to 1180celcius. X-Ray diffraction results show that the tetragonal phase content increases from 68.9% to 85.7% with the increasing sintering temperature. Transmission electron microscope characterizations reveal that micromorphology and domain morphology are sensitive to grain size. In addition, the dielectric and ferroelectric properties are almost independent on the sintering temperature, whereas an optimal piezoelectric constant d(33) of 450 pC/N is achieved when the sintering temperature is 1120celcius, which can be due to the suitable coexistence of the rhombohedral and tetrahedral phase, as well as the coexistence of nanodomains and subsize strip-like domain. All of the results not only open a new window to improve d(33) of piezoelectric ceramics but also help to further understand microstructure-property relationships in piezoelectric ceramics.