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비정상 입성장을 통한 비연계 압전 세라믹 단결정 제조 연구
박선화(Seonhwa Park),이정우(Jung Woo Lee),조경훈(Kyung-Hoon Cho),민유호(Yuho Min),안철우(Cheol-Woo Ahn) 한국세라믹학회 2021 세라미스트 Vol.24 No.3
In this manuscript, an interesting phenomenon is reported. It has been reported that the growth of single crystals is observed in donor-doped (K,Na)NbO₃ (KNN)-based ceramics. It is very interesting that the growth happens without the addition of a seed. The growth of huge grains (single crystal, approximately 30 mm,) occurs due to the abnormal grain growth (AGG) in KNN-based ceramics. In the AGG compositions, moreover, the seed plates can be synthesized by not topochemical reaction but simple molten salt synthesis (SMSS) which is a simple-and-cheap process. They can be a good candidate for the seeds at reactive templated grain growth (RTGG) or templated grain growth (TGG) process.
Templated Grain Growth for High-Performance Lead-Free Piezoceramics
박선화(Seonhwa Park),안철우(Cheol-Woo Ahn),이정우(Jung Woo Lee),민유호(Yuho Min) 한국세라믹학회 2021 세라미스트 Vol.24 No.2
As a new class of novel technologies for fabrication of piezoceramics, the templated grain growth (TGG) has been gaining tremendous attention due to the ability to align ferroelectric domains and thus improve piezoelectric properties, which are similar with the ones of single crystal. Towards the realization of textured grains in a specific direction, two-dimensional template materials should be preferentially needed with some specific conditions such as small lattice mismatch, similar crystal structure and composition compared to those of matrix piezoelectric ceramic powders. This mini review presents recent progress on TGG to provide highperformance textured (K,Na)NbO3 ceramics as an ideal lead-free to lead-based piezoceramics with a focus on the fabrication fundamentals and underlying mechanism. Additionally, some parameters related to the fabrication of green body during a tape casting are surveyed. Finally, we provide an insight into challenges and future directions in the TGG-based piezoceramics.