Gigantic Electrostrain in Duplex Structured Alkaline Niobates

被引：93

作者：

Choi, Si-Young ^{[1
]}

Jeong, Soon-Jong ^{[2
]}

Lee, Dae-Su ^{[2
]}

Kim, Min-Soo ^{[2
]}

Lee, Jae-Shin ^{[3
]}

Cho, Jeong Ho ^{[4
]}

Kim, Byoung Ik ^{[4
]}

Ikuhara, Yuichi ^{[5
]}

机构：

[1] Korea Inst Mat Sci, Adv Characterizat & Anal Grp, Chang Won 642831, South Korea

[2] Korea Electrotechnol Res Inst, Adv Mat & Applicat Res Lab, Chang Won 642120, South Korea

[3] Univ Ulsan, Sch Mat Sci & Engn, Ulsan 680749, South Korea

[4] Korea Inst Ceram Engn & Technol, Elect Component Ctr, Seoul 153801, South Korea

[5] Univ Tokyo, Inst Engn Innovat, Tokyo 1138656, Japan

来源：

CHEMISTRY OF MATERIALS | 2012年 / 24卷 / 17期

关键词：

core/shell; perovskites; electron microscopy; electric field induced strain; actuator; FREE PIEZOELECTRIC CERAMICS; LEAD-FREE PIEZOCERAMICS; INDUCED PHASE-TRANSITION; MICROSCOPY;

D O I：

10.1021/cm301324h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We demonstrate that an exceptionally large strain can be induced in CaZrO3-modified alkaline-niobates by electric fields. The maximum induced strain of our niobate-based ceramics could reach more than 1,000 pm/V, which is a much higher value than that of commercial soft PZT ceramics. Atomic-scale annular bright-field (ABF) and annular dark-field (ADF) scanning transmission electron microscopy (STEM) directly revealed that individual single grains were composed of an electrically duplex core shell structure; relaxor-like cores and paraelectric shells. Based on this ABF STEM analysis along with electrical measurements, a plausible mechanism explaining the high strain effect in the present work was suggested. This new material offers an unprecedented opportunity to produce efficient Pb-free piezoelectrics for applications that require large electrostrictive motion.

引用

页码：3363 / 3369

页数：7

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