Zhao, Changhao ; Gao, Shuang ; Kleebe, Hans-Joachim ; Tan, Xiaoli ; Koruza, Jurij ; Rödel, Jürgen (2022)
Coherent Precipitates with Strong Domain Wall Pinning in Alkaline Niobate Ferroelectrics.
In: Advanced Materials
doi: 10.1002/adma.202202379
Artikel, Bibliographie

Kurzbeschreibung (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, piezo-electric 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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