Title: A nanoscale shape memory oxide
Authors: Zhang, Jinxing
Ke, Xiaoxing
Gou, Gaoyang
Seidel, Jan
Xiang, Bin
Yu, Pu
Liang, Wen-I
Minor, Andrew M.
Chu, Ying-hao
Van Tendeloo, Gustaaf
Ren, Xiaobing
Ramesh, Ramamoorthy
Department of Materials Science and Engineering
Issue Date: 1-Nov-2013
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 similar to 14% and a large volumetric work density of similar to 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.
URI: http://dx.doi.org/10.1038/ncomms3768
ISSN: 2041-1723
DOI: 10.1038/ncomms3768
Volume: 4
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