Giant piezoelectricity of Sm-doped Pb(MgNb)O-PbTiO single crystals.

Authors:
Fei Li
Fei Li
State Key Laboratory of Vegetation and Environmental Change
China
Bin Xu
Bin Xu
State Key Laboratory of Pollution Control and Resource Reuse
China
Zhenxiang Cheng
Zhenxiang Cheng
University of Wollongong
Australia
Elizabeth C Dickey
Elizabeth C Dickey
University Park
United States
James M LeBeau
James M LeBeau
University of California
United States
Jianli Wang
Jianli Wang
Institute of Immunology
New Delhi | India
Jun Luo
Jun Luo
Center for Electron Microscopy
China

Science 2019 04 18;364(6437):264-268. Epub 2019 Apr 18.

Materials Research Institute, Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA 16802, USA.

High-performance piezoelectrics benefit transducers and sensors in a variety of electromechanical applications. The materials with the highest piezoelectric charge coefficients () are relaxor-PbTiO crystals, which were discovered two decades ago. We successfully grew Sm-doped Pb(MgNb)O-PbTiO (Sm-PMN-PT) single crystals with even higher values ranging from 3400 to 4100 picocoulombs per newton, with variation below 20% over the as-grown crystal boule, exhibiting good property uniformity. We characterized the Sm-PMN-PT on the atomic scale with scanning transmission electron microscopy and made first-principles calculations to determine that the giant piezoelectric properties arise from the enhanced local structural heterogeneity introduced by Sm dopants. Rare-earth doping is thus identified as a general strategy for introducing local structural heterogeneity in order to enhance the piezoelectricity of relaxor ferroelectric crystals.

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http://dx.doi.org/10.1126/science.aaw2781DOI Listing

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April 2019
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