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Received October 1, 2007
Accepted October 19, 2007
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Cr O 및 Mn O 의 코팅에 의한 Core-Shell 구조의 BaTiO 분말 제조
Preparation of Core-Shell Structured BaTiO3 Powder Via Coating of Cr2O3 and Mn2O3
Byung-Soo Kwon
Hye-Un Lee
Jung-Yoon Jang
Sang-Kil Lee
In Jae Chung1
Young-Sang Cho2
Tae-Jin Park2
Guang-Jin Choi†
인제대학교 제약공학과, 621-749 경남 김해시 어방동 607 1KAIST 생명화학공학과, 305-701 대전시 유성구 구성동 373-1 2KIST 청정에너지연구센터, 136-791 서울시 성북구 하월곡동 39-1
Pharmaceutical Engineering, Inje University, 607 Eobanf-dong, Gimhae, Gyeongnam 621-749, Korea 1Chemical & Biomolecular Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea 2Clean Energy Research Center, KIST, 39-1 Hawolgok-dong, Sungbuk-gu, Seoul 136-791, Korea
pegchoi@inje.ac.kr
Korean Chemical Engineering Research, February 2008, 46(1), 99-105(7), NONE Epub 28 February 2008
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Abstract
본 연구에서는 MLCC용 BaTiO3에 첨가되는 Cr2O3와 Mn2O3의 나노코팅에 의한 core-shell 구조의 BaTiO3 분말을 제조하였다. 예비실험을 통해서 KMnO4 및 K2Cr2O4 그리고 sulfur를 사용하는 최적의 액상반응조건이 확립되었다. 본 연구에서는 두 첨가제 분말을 합성하였고 동일한 반응조건으로 두 첨가제를 BaTiO3 분말표면에 코팅하였다. 코팅은 one-step과 two-step의 두 방법으로 구분하여 시행하였고 그 결과를 분석·비교하였다. 결론적으로 말해서, Cr2O3와 Mn2O3의 두 첨가제는 용이한 반응조건에서 높은 수율로 우수한 품질의 코팅막을 형성하므로써, 첨가제 함량과 코팅막 특성의 정밀한 조절이 용이함을 보여주었다.
Core-shell structured BaTiO3 powders were produced via nano-coating of Cr2O3 and Mn2O3 to barium titanate powder system for MLCCs. From preliminary experiments, the optimal solution reaction condition employing using KMnO4, K2Cr2O4 and sulfur was established. Not only powders of Cr2O3 and Mn2O3 were synthesized but also their coating on BaTiO3 powders were peformed under the same reaction condition. The coating was carried out in two ways, one-step and two-step, and its results were characterized for comparison. Conclusively speaking, two oxide additives were coated onto the BaTiO3 powder surface with high quality and excellent reaction yield even under mild condition, which indicates that the contents as well as the properties of additive shell layer can be precisely controlled with rather ease.
Keywords
References
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Matijevic E, in Materials Science Monographs vol. 38A, High Tech Ceramics Part A, 441-458 (1990)
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