High-performance KNN piezoceramics with reproducibility and chemical stability. Part I: Solid-state reaction route |
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Authors: | Lucile Vaschalde Encarnación G. Víllora Kiyoshi Shimamura |
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Affiliation: | 1. National Institute for Materials Science, Tsukuba, Japan;2. National Institute for Materials Science, Tsukuba, Japan Graduate School of Advanced Science and Engineering, Waseda University, Shinjuku, Tokyo, Japan |
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Abstract: | (K,Na)NbO3-based compounds are attracting much attention for their high potential as Pb-free piezoelectric ceramics. They have, however, three major drawbacks to overcome in order to achieve a mature development: densification, reproducibility, and chemical stability. In this first part, based on standard solid-state reaction, the way to synthesize high-density homogeneous ceramics with high piezoelectric performance and chemical stability is elucidated. It relies on a low-temperature spark-plasma sintering process, after the raw materials have been finely pulverized prior to reaction. The reproducibility, however, remains a pending issue due to the unavoidable random formation of parasitic phases. |
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Keywords: | KNN lead-free ceramics perovskites piezoelectric materials/properties |
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