期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 31, 期 10, 页码 1915-1920出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2011.04.002
关键词
Grain growth; Interface; Perovskite; Microstructure-final; Lead-free piezoelectric
资金
- Ministry of Knowledge Economy (MKE), Republic of Korea [PM007-10-01-01]
- Ministry of Education, Science and Technology [2009-0094039]
- Korea Evaluation Institute of Industrial Technology (KEIT) [PM007-10-01] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Grain coarsening behavior in the 95Na(1/2)Bi(1/2)TiO(3)-5BaTiO(3) system has been studied as a function of the addition of TiO2. As the amount of added TiO2 was increased, the grain shape changed to a more faceted cube, indicating an increase in the step free energy of the facets, and hence a rise in the critical driving force for appreciable growth of grains. Grain coarsening behavior also changed from pseudo-normal to abnormal with an increasing TiO2 concentration and thus increased faceting. The pseudo-normal behavior observed in the system without TiO2 addition also changed to quite abnormal behavior during extended sintering. These observations support our theoretical prediction based on the coupling effects between the maximum driving force for growth and the critical driving force for appreciable growth. (C) 2011 Elsevier Ltd. All rights reserved.
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