Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7898659 | Journal of the European Ceramic Society | 2018 | 19 Pages |
Abstract
It has been reported that single crystals could be grown by normal sintering process, without the addition of a seed, in (K,Na)NbO3 (KNN)-based ceramics. The growth of huge grains (approximately 5-30Â mm) is due to the donor effect on abnormal grain growth (AGG) in KNN-based ceramics. In this study, a composition design rule is suggested to obtain the large single crystal without the seed addition in KNN-based ceramics. In addition, it is also identified by the microstructure observation that the huge grains can be due to the donor effect on the abnormal grain growth which is found in perovskite materials. The donor ratio must be designed to be located at the range between 0.7% and 0.9% compared to that of Na+ ions, in order to obtain the large single crystals in KNN-based ceramics. This range of the donor ratio is narrower than that in BaTiO3 (or SrTiO3) ceramics.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Attaur Rahman, Kyung-Hoon Cho, Cheol-Woo Ahn, Jungho Ryu, Jong-Jin Choi, Jong-Woo Kim, Woon-Ha Yoon, Joon-Hwan Choi, Dong-Soo Park, Byung-Dong Hahn,