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Lattice strain effects on the piezoelectric properties of crystalline ferroelectrics have been extensively studied for decades; however, the strain dependence of the piezoelectric properties at nano-level has yet to be investigated. Herein, a new overview of the super-strain of nanoporous polycrystalline ferroelectrics is reported for the first time using a nanoengineered barium calcium zirconium titanate composition (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3 (BCZT). Atomic-level investigations show that the controlled pore wall thickness contributes to highly strained lattice structures that also retain the crystal size at the optimal value (<30 nm), which is the primary contributor to high piezoelectricity. The strain field derived from geometric phase analysis at the atomic level and aberration-corrected high-resolution scanning transmission electron microscopy (STEM) yields of over 30% clearly show theoretical agreement with high piezoelectric properties. The uniqueness of this work is the simplicity of the synthesis; moreover the piezoresponse d33 becomes giant, at around 7500 pm V−1. This response is an order of magnitude greater than that of lead zirconate titanate (PZT), which is known to be the most successful ferroelectric over the past 50 years. This concept utilizing nanoporous BCZT will be highly useful for a promising high-density electrolyte-free dielectric capacitor and generator for energy harvesting in the future.

権利情報:

• cc-by-3.0
  

キーワード: nanoporous, piezoresponse, ferroelectric, strained lattice structure, piezoelectric

刊行年月日: 2024-05-20

出版者: Royal Society of Chemistry (RSC)

掲載誌:

• Chemical Science (ISSN: 20416520) vol. 15 issue. 24 p. 9147-9154

研究助成金:

• Japan Science and Technology Agency JPMJER2003
• Nagoya University
• Australian Research Council LP200200689
• University of Queensland
• Kumamoto University

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1039/d3sc06712b

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更新時刻: 2024-10-10 16:30:49 +0900

MDRでの公開時刻: 2024-10-10 16:30:49 +0900