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Actuators 2016, 5(2), 11;

Antiferroelectric Shape Memory Ceramics

International Center for Actuators and Transducers, The Pennsylvania State University, University Park, PA 16801, USA
Academic Editor: Delbert Tesar
Received: 21 March 2016 / Revised: 8 May 2016 / Accepted: 11 May 2016 / Published: 18 May 2016
(This article belongs to the Special Issue Piezoelectric Actuators)
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Antiferroelectrics (AFE) can exhibit a “shape memory function controllable by electric field”, with huge isotropic volumetric expansion (0.26%) associated with the AFE to Ferroelectric (FE) phase transformation. Small inverse electric field application can realize the original AFE phase. The response speed is quick (2.5 ms). In the Pb0.99Nb0.02[(Zr0.6Sn0.4)1-yTiy]0.98O3 (PNZST) system, the shape memory function is observed in the intermediate range between high temperature AFE and low temperature FE, or low Ti-concentration AFE and high Ti-concentration FE in the composition. In the AFE multilayer actuators (MLAs), the crack is initiated in the center of a pair of internal electrodes under cyclic electric field, rather than the edge area of the internal electrodes in normal piezoelectric MLAs. The two-sublattice polarization coupling model is proposed to explain: (1) isotropic volume expansion during the AFE-FE transformation; and (2) piezoelectric anisotropy. We introduce latching relays and mechanical clampers as possible unique applications of shape memory ceramics. View Full-Text
Keywords: antiferroelectrics; PNZST; shape memory ceramics; phase transformation; two-sublattice polarization coupling model; electrostriction antiferroelectrics; PNZST; shape memory ceramics; phase transformation; two-sublattice polarization coupling model; electrostriction

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Uchino, K. Antiferroelectric Shape Memory Ceramics. Actuators 2016, 5, 11.

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