Giant electric-field-induced strains in lead-free ceramics for actuator applications - status and perspective
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- Giant electric-field-induced strains in lead-free ceramics for actuator applications - status and perspective
- Jo, Wook; Dittmer, Robert; Acosta, Matias; Zang, Jiadong; Groh, Claudia; Sapper, Eva; Wang, Ke; Roedel, Juergen
- Actuator; Bismuth sodium titanate; Electric-field-induced phase transition; Giant electric-field-induced strain; Incipient piezoelectric; Lead-free piezoceramics; Relaxor ferroelectric
- Issue Date
- JOURNAL OF ELECTROCERAMICS, v.29, no.1, pp.71 - 93
- In response to the current environmental regulations against the use of lead in daily electronic devices, a number of investigations have been performed worldwide in search for alternative piezoelectric ceramics that can replace the market-dominating lead-based ones, representatively Pb(Zr (x) Ti1-x )O-3 (PZT)-based solid solutions. Selected systems of potential importance such as chemically modified and/or crystallographically textured (K, Na)NbO3 and (Bi1/2Na1/2)TiO3-based solid solutions have been developed. Nevertheless, only few achievements have so far been introduced to the marketplace. A recent discovery has greatly extended our tool box for material design by furnishing (Bi1/2Na1/2)TiO3-based ceramics with a reversible phase transition between an ergodic relaxor state and a ferroelectric with the application of electric field. This paired the piezoelectric effect with a strain-generating phase transition and extended opportunities for actuator applications in a completely new manner. In this contribution, we will present the status and perspectives of this new class of actuator ceramics, aiming at covering a wide spectrum of topics, i.e., from fundamentals to practice.
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