Gigantic electrostrain in duplex structured alkaline niobates

Si Young Choi; Soon Jong Jeong; Dae Su Lee; Min Soo Kim; Jae Shin Lee; Jeong Ho Cho; Byoung Ik Kim; Yuichi Ikuhara

doi:10.1021/cm301324h

Gigantic electrostrain in duplex structured alkaline niobates

Si Young Choi, Soon Jong Jeong, Dae Su Lee, Min Soo Kim, Jae Shin Lee, Jeong Ho Cho, Byoung Ik Kim, Yuichi Ikuhara

Research output: Contribution to journal › Article › peer-review

78 Citations (Scopus)

Abstract

We demonstrate that an exceptionally large strain can be induced in CaZrO ₃-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.

Original language	English
Pages (from-to)	3363-3369
Number of pages	7
Journal	Chemistry of Materials
Volume	24
Issue number	17
DOIs	https://doi.org/10.1021/cm301324h
Publication status	Published - 2012 Sep 11

Keywords

actuator
core/shell
electric field induced strain
electron microscopy
perovskites

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Materials Chemistry

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10.1021/cm301324h

Cite this

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title = "Gigantic electrostrain in duplex structured alkaline niobates",

abstract = "We demonstrate that an exceptionally large strain can be induced in CaZrO 3-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.",

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AU - Choi, Si Young

AU - Jeong, Soon Jong

AU - Lee, Dae Su

AU - Kim, Min Soo

AU - Lee, Jae Shin

AU - Cho, Jeong Ho

AU - Kim, Byoung Ik

AU - Ikuhara, Yuichi

PY - 2012/9/11

Y1 - 2012/9/11

N2 - We demonstrate that an exceptionally large strain can be induced in CaZrO 3-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.

AB - We demonstrate that an exceptionally large strain can be induced in CaZrO 3-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.

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KW - core/shell

KW - electric field induced strain

KW - electron microscopy

KW - perovskites

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Gigantic electrostrain in duplex structured alkaline niobates

Abstract

Keywords

ASJC Scopus subject areas

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