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Shape memory effect in Cu-doped K0.5Na0.5NbO3 ceramics.

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Bibliographic Details
Title:	Shape memory effect in Cu-doped K0.5Na0.5NbO3 ceramics.
Authors:	Shi, Xinnan¹ (AUTHOR), Guo, Xiongxin¹ (AUTHOR), Qi, Yagang¹ (AUTHOR), Xia, Baoju¹ (AUTHOR), Yang, Xinrong¹ (AUTHOR), Chu, Baojin¹ (AUTHOR) chubj@ustc.edu.cn
Source:	Ceramics International. Jun2026:Part C, Vol. 52 Issue 14, p27186-27197. 12p.
Subjects:	Shape memory effect, Ferroelectric ceramics, Ferroelectric materials, Potassium niobate, Phase transitions
Abstract:	Ferroelectric ceramics have been found to exhibit the shape memory effect (SME), offering great promise for intelligent applications in harsh environments, but their application potential is limited by low recoverable strains. To address this challenge, we investigate lead-free K 0.5 Na 0.5 NbO 3 (KNN) as a promising candidate, elucidating its shape memory effect and the influence of CuO doping. The results reveal that the SME in KNN-based ceramics originates from two reversible first-order phase transitions. While pure KNN exhibits a large irrecoverable strain, all doped compositions achieve near-zero irrecoverable strain due to the introduction of defect dipoles and complexes induced by CuO doping. Notably, 0.2 mol% CuO exhibits a maximum fixed strain of ∼0.58% with a recovery ratio of 98.4%, while the 0.5 mol% composition exhibits a lower fixed strain but a higher recovery ratio along with superior cyclic stability. These differences originate from the competition between distinct defect configurations and their respective roles in governing domain mobility. This work demonstrates the important role of defects in modulating the SME of ferroelectrics and establishes a practical strategy for designing high-performance lead-free shape memory ceramics. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	Ferroelectric ceramics have been found to exhibit the shape memory effect (SME), offering great promise for intelligent applications in harsh environments, but their application potential is limited by low recoverable strains. To address this challenge, we investigate lead-free K 0.5 Na 0.5 NbO 3 (KNN) as a promising candidate, elucidating its shape memory effect and the influence of CuO doping. The results reveal that the SME in KNN-based ceramics originates from two reversible first-order phase transitions. While pure KNN exhibits a large irrecoverable strain, all doped compositions achieve near-zero irrecoverable strain due to the introduction of defect dipoles and complexes induced by CuO doping. Notably, 0.2 mol% CuO exhibits a maximum fixed strain of ∼0.58% with a recovery ratio of 98.4%, while the 0.5 mol% composition exhibits a lower fixed strain but a higher recovery ratio along with superior cyclic stability. These differences originate from the competition between distinct defect configurations and their respective roles in governing domain mobility. This work demonstrates the important role of defects in modulating the SME of ferroelectrics and establishes a practical strategy for designing high-performance lead-free shape memory ceramics. [ABSTRACT FROM AUTHOR]
ISSN:	02728842
DOI:	10.1016/j.ceramint.2026.04.267