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Zhao, Changhao ; Gao, Shuang ; Kleebe, Hans‐Joachim ; Tan, Xiaoli ; Koruza, Jurij ; Rödel, Jürgen ( , Advanced Materials)
Abstract High‐power piezoelectric applications are predicted to share approximately one‐third of the lead‐free piezoelectric ceramic market in 2024 with alkaline niobates as the primary competitor. To suppress self‐heating in high‐power devices due to mechanical loss when driven by large electric fields, piezoelectric hardening to restrict domain wall motion is required. In the present work, highly effective piezoelectric hardening via coherent plate‐like precipitates in a model system of the (Li,Na)NbO3(LNN) solid solution delivers a reduction in losses, quantified as an electromechanical quality factor, by a factor of ten. Various thermal aging schemes are demonstrated to control the average size, number density, and location of the precipitates. The established properties are correlated with a detailed determination of short‐ and long‐range atomic structure by X‐ray diffraction and pair distribution function analysis, respectively, as well as microstructure determined by transmission electron microscopy. The impact of microstructure with precipitates on both small‐ and large‐field properties is also established. These results pave the way to implement precipitate hardening in piezoelectric materials, analogous to precipitate hardening in metals, broadening their use cases in applications.
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Seo, Yo-Han ; Franzbach, Daniel J. ; Koruza, Jurij ; Benčan, Andreja ; Malič, Barbara ; Kosec, Marija ; Jones, Jacob L. ; Webber, Kyle G. ( , Physical Review B)
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Höfling, Marion ; Zhou, Xiandong ; Riemer, Lukas M. ; Bruder, Enrico ; Liu, Binzhi ; Zhou, Lin ; Groszewicz, Pedro B. ; Zhuo, Fangping ; Xu, Bai-Xiang ; Durst, Karsten ; et al ( , Science)
Defects are essential to engineering the properties of functional materials ranging from semiconductors and superconductors to ferroics. Whereas point defects have been widely exploited, dislocations are commonly viewed as problematic for functional materials and not as a microstructural tool. We developed a method for mechanically imprinting dislocation networks that favorably skew the domain structure in bulk ferroelectrics and thereby tame the large switching polarization and make it available for functional harvesting. The resulting microstructure yields a strong mechanical restoring force to revert electric field–induced domain wall displacement on the macroscopic level and high pinning force on the local level. This induces a giant increase of the dielectric and electromechanical response at intermediate electric fields in barium titanate [electric field–dependent permittivity (ε33) ≈ 5800 and large-signal piezoelectric coefficient (
d 33*) ≈ 1890 picometers/volt]. Dislocation-based anisotropy delivers a different suite of tools with which to tailor functional materials.