A nanoscale shape memory oxide

Jinxing Zhang (), Xiaoxing Ke (), Gaoyang Gou, Jan Seidel, Bin Xiang, Pu Yu, Wen-I. Liang, Andrew M. Minor, Ying-hao Chu, Gustaaf Van Tendeloo, Xiaobing Ren and Ramamoorthy Ramesh
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Jinxing Zhang: Beijing Normal University
Xiaoxing Ke: EMAT (Electron Microscopy for Materials Science), University of Antwerp, Groenenborgerlaan 171, Antwerp 2020, Belgium
Gaoyang Gou: Multi-disciplinary Materials Research Center, Frontier Institute of Science and Technology, Xi’an Jiaotong University
Jan Seidel: University of California
Bin Xiang: CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China
Pu Yu: University of California
Wen-I. Liang: National Chiao Tung University
Andrew M. Minor: National Center for Electron Microscopy, Lawrence Berkeley National Laboratory
Ying-hao Chu: National Chiao Tung University
Gustaaf Van Tendeloo: EMAT (Electron Microscopy for Materials Science), University of Antwerp, Groenenborgerlaan 171, Antwerp 2020, Belgium
Xiaobing Ren: Multi-disciplinary Materials Research Center, Frontier Institute of Science and Technology, Xi’an Jiaotong University
Ramamoorthy Ramesh: University of California

Nature Communications, 2013, vol. 4, issue 1, 1-8

Abstract: Abstract Stimulus-responsive shape-memory materials have attracted tremendous research interests recently, with much effort focused on improving their mechanical actuation. Driven by the needs of nanoelectromechanical devices, materials with large mechanical strain, particularly at nanoscale level, are therefore desired. Here we report on the discovery of a large shape-memory effect in bismuth ferrite at the nanoscale. A maximum strain of up to ~14% and a large volumetric work density of ~600±90 J cm−3 can be achieved in association with a martensitic-like phase transformation. With a single step, control of the phase transformation by thermal activation or electric field has been reversibly achieved without the assistance of external recovery stress. Although aspects such as hysteresis, microcracking and so on have to be taken into consideration for real devices, the large shape-memory effect in this oxide surpasses most alloys and, therefore, demonstrates itself as an extraordinary material for potential use in state-of-art nanosystems.

Date: 2013
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DOI: 10.1038/ncomms3768

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