Repetitive grain growth behavior in nano-sized $BaTiO_3$ system and its applications초미립 $BaTiO_3$ system에서 입자크기에 따른 입자성장거동과 그 응용

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Grain growth inhibition, densification and unimodal size distribution of MLCC dielectric layer is important in order to achieve high capacity at the same time as thinning. Therefore, it is a need for experiments to understand and control the densification and grain growth of nano-sized $BaTiO_3$ dielectrics for MLCC. Repetitive abnormal grain growth was observed during the sintering of nano-sized $BaTiO_3$. The primary abnormal grain growth occurred, and the abnormal grains impinged upon each other at the beginning. During extended sintering for 24h, however, some of the impinged abnormal grains grew, showing secondary abnormal grain growth behavior. These observed repetitive abnormal grain growth is well explained with the coupling effect of the maximum driving force for grain growth in the sample and the critical driving force for the appreciable migration of faceted boundaries. Additionally, the combining of the 2-step and hetero-atmosphere sintering processes can suppress the abnormal grain growth of nano-sized $BaTiO_3$ and effectively promote densification even at low temperatures.
Advisors
Chung, Sung-Yoonresearcher정성윤researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2018.2,[v, 106 p. :]

Keywords

BaTiO3▼aGrain boundary structure▼aRepetitive Grain Growth Behavior▼aTwo-step sintering▼aHetero-atmosphere sintering; 티탄산바륨▼a입계구조▼a반복적인 입자성장양상▼a이단소결▼a이종분위기소결▼aMixed Mechanism Principle

URI
http://hdl.handle.net/10203/265021
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=734355&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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