| Cr-doped Celsian계 녹색안료의 합성과 적용 |
| 정현식, 김연주, 최수녕, 이병하 |
| 명지대학교 신소재공학과 |
| Synthesis of Cr-doped Celsian Green Pigments and Their Application |
| Hyun-Sik Chung, Yeon-Ju Kim, Soo-Nyong Choi, Byung-Ha Lee |
| Department of Material Science & Engineering, Myongji University |
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| ABSTRACT |
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During the process of synthesizing green celsian pigments, attempts were made to replace a given amount of $BaCO_3$ with $SrCO_3$ to accelerate the hexagonal to monoclinic celsian phase transition, which was assumed to promote color development. Monoclinic celsian have been synthesized from Hongkong-Kaolin, $BaCO_3$, $SrCO_3$, $Al(OH)_3$, $SiO_2$ and $SrCO_3$ with 1 to 1.5 wt% of LiF as a mineralizer from 1100 to $1300^{circ}C$. It was found that replacing $BaCO_3$ with $SrCO_3$ allowed monoclinic celsian to be formed at a lower temperature. While the pigments containing 1 mole of $BaCO_3$ were difficult to synthesize monoclinic celsian with absence of the mineralizer, the formation of monoclinic celsian was successfully achieved even without mineralizer by using 0.25 mole of $SrCO_3$ at $1250^{circ}C$ for 1 h. The color development was improved from yellowish green to green with increasing amount of $SrCO_3$ being replaced. |
| Key words:
Monoclinic celsian, Pigments, Yellowish green, $Cr_2O_3$, $SrCO_3$ |
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