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Ultra-large electric field-induced strain in potassium sodium niobate crystals.

ABSTRACT: Electromechanical coupling in piezoelectric materials allows direct conversion of electrical energy into mechanical energy and vice versa. Here, we demonstrate lead-free (K x Na1-x )NbO3 single crystals with an ultrahigh large-signal piezoelectric coefficient d33* of 9000 pm V-1, which is superior to the highest value reported in state-of-the-art lead-based single crystals (~2500 pm V-1). The enhanced electromechanical properties in our crystals are realized by an engineered compositional gradient in the as-grown crystal, allowing notable reversible non-180° domain wall motion. Moreover, our crystals exhibit temperature-insensitive strain performance within the temperature range of 25°C to 125°C. The enhanced temperature stability of the response also allows the materials to be used in a wider range of applications that exceed the temperature limits of current lead-based piezoelectric crystals.

SUBMITTER: Hu C

PROVIDER: S-EPMC7101228 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Ultra-large electric field-induced strain in potassium sodium niobate crystals.

Hu Chengpeng C Meng Xiangda X Zhang Mao-Hua MH Tian Hao H Daniels John E JE Tan Peng P Huang Fei F Li Li L Wang Ke K Li Jing-Feng JF Lu Qieni Q Cao Wenwu W Zhou Zhongxiang Z

Science advances 20200327 13

Electromechanical coupling in piezoelectric materials allows direct conversion of electrical energy into mechanical energy and vice versa. Here, we demonstrate lead-free (K x Na1-x )NbO3 single crystals with an ultrahigh large-signal piezoelectric coefficient d 33* of 9000 pm V-1, which is superior to the highest value reported in state-of-the-art lead-based single crystals (~2500 pm V-1). The enhanced electro ...[more]

PMID: 32258401

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