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Open AccessArticle

Grain Growth Behavior of 0.95(Na0.5Bi0.5)TiO3–0.05BaTiO3 Controlled by Grain Shape and Second Phase

1
School of Materials Science and Engineering, Changwon National University, 20 Changwondaehak-ro, Uichang-gu, Changwon, Gyeongsangnam 51140, Korea
2
School of Materials Science and Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Korea
3
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
4
School of Materials Science and Engineering, Gyeongsang National University, 501 Jinjudaero, Jinju, Gyeongnam 52828, Korea
*
Author to whom correspondence should be addressed.
Materials 2020, 13(6), 1344; https://doi.org/10.3390/ma13061344
Received: 5 February 2020 / Revised: 6 March 2020 / Accepted: 13 March 2020 / Published: 16 March 2020
(This article belongs to the Special Issue Sintering and Grain Growth Behavior of Ceramics)
The grain growth behavior of 0.95(Na0.5Bi0.5)TiO3 –0.05BaTiO3 (mole fraction, NBT–5BT) grains was investigated with excess Bi2O3 addition. The powder compacts of NBT–5BT were sintered at 1200 °C for various sintering times and with various amounts of Bi2O3 (0.1, 1.5, 4.0 and 10.0 mol%). When Bi2O3 was added to round-edged cubic NBT–5BT, the grain shape changed to a more faceted cube and the amount of liquid phase increased during sintering. A more faceted cubic grain shape indicates an increase in the critical driving force for appreciable growth of grains. However, obvious abnormal grain growth did not appear in any of the NBT–5BT samples with excess Bi2O3. The amount of liquid phase increased as the amount of Bi2O3 increased. Therefore, the rate of grain growth could be decreased by the increasing the distance for the diffusion of atoms. These observations allowed us to conclude that the growth of Bi2O3-excess NBT–5BT grains is governed by the growth of facet planes via the two-dimensional nucleation grain growth mechanism during changing grain shape and amount of liquid. View Full-Text
Keywords: grain growth; grain shape; liquid phase; sintering; microstructure; NBT-BT grain growth; grain shape; liquid phase; sintering; microstructure; NBT-BT
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MDPI and ACS Style

Jeon, S.-C.; Fisher, J.G.; Kang, S.-J.L.; Moon, K.-S. Grain Growth Behavior of 0.95(Na0.5Bi0.5)TiO3–0.05BaTiO3 Controlled by Grain Shape and Second Phase. Materials 2020, 13, 1344. https://doi.org/10.3390/ma13061344

AMA Style

Jeon S-C, Fisher JG, Kang S-JL, Moon K-S. Grain Growth Behavior of 0.95(Na0.5Bi0.5)TiO3–0.05BaTiO3 Controlled by Grain Shape and Second Phase. Materials. 2020; 13(6):1344. https://doi.org/10.3390/ma13061344

Chicago/Turabian Style

Jeon, Sang-Chae; Fisher, John G.; Kang, Suk-Joong L.; Moon, Kyoung-Seok. 2020. "Grain Growth Behavior of 0.95(Na0.5Bi0.5)TiO3–0.05BaTiO3 Controlled by Grain Shape and Second Phase" Materials 13, no. 6: 1344. https://doi.org/10.3390/ma13061344

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