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Preparation of Core-Shell Structured BaTiO3 Powder Via Coating of Cr2O3 and Mn2O3  

Kwon, Byung-Soo (Pharmaceutical Engineering, Inje University)
Lee, Hye-Un (Pharmaceutical Engineering, Inje University)
Jang, Jung-Yoon (Pharmaceutical Engineering, Inje University)
Lee, Sang-Kil (Pharmaceutical Engineering, Inje University)
Chung, In Jae (Chemical & Biomolecular Engineering, KAIST)
Cho, Young-Sang (Clean Energy Research Center, KIST)
Park, Tae-Jin (Clean Energy Research Center, KIST)
Choi, Guang-Jin (Pharmaceutical Engineering, Inje University)
Publication Information
Korean Chemical Engineering Research / v.46, no.1, 2008 , pp. 99-105 More about this Journal
Abstract
Core-shell structured $BaTiO_3$ powders were produced via nano-coating of $Cr_2O_3$ and $Mn_2O_3$ to barium titanate powder system for MLCCs. From preliminary experiments, the optimal solution reaction condition employing using $KMnO_4$, $K_2Cr_2O_4$ and sulfur was established. Not only powders of $Cr_2O_3$ and $Mn_2O_3$ were synthesized but also their coating on $BaTiO_3$ 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 $BaTiO_3$ 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
Barium Titanate Powder; MLCC; Chromium Oxide; Manganese Oxide; Nano-Coating; Core-Shell Structure;
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