한국해양대학교

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수열합성법에 의한 미립 BaTiO₃ 분말의 합성

Title
수열합성법에 의한 미립 BaTiO₃ 분말의 합성
Alternative Title
Preparation of Fine BaTiO₃ Powder by the Hydrothermal Process
Author(s)
최경식
Publication Year
2002
Publisher
한국해양대학교
URI
http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002173916
http://repository.kmou.ac.kr/handle/2014.oak/9518
Abstract
BaTiO₃ powders of nanometer-sized were synthesized at the temperature range of 110℃~180℃ in various pH range, and the hydrothermal process, one of the wet-chemical methods, that can make the morphology of powers more homogeneous and finer than solid-state reactions. BaCl₂ and TiCl₄ were used as starting materials, and NH₄OH was a precipitating agent.


The synthesized powders were analysed by the XRD, TG-DTA, SEM, TEM and BET. And then, the dielectric and electronic properties of BaTiO₃ ceramics sintered at the temperature range of 1150~1350℃ were evaluated.


Homogeneous and fine BaTiO₃ powders were obtained at the reaction temperature over 110℃ and the powders synthesized at 130℃ shows that the properties of powders were almost the same regardless of the reaction time.


TEM investigation showed that the size of the BaTiO₃ powder synthesized at 130℃ for 2h was 25~35nm and the result of BET revealed that the surface area of powders was about 77.43㎡/g. The dielectric constant of the ceramic sintered at 1270℃ for 2h was as high as 3000.
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재료공학과 > Thesis
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