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J. Korean Ceram. Soc. > Volume 46(3); 2009 > Article
Journal of the Korean Ceramic Society 2009;46(3): 242.
doi: https://doi.org/10.4191/kcers.2009.46.3.242
지오폴리머 기술에 의한 포스테라이트 분말의 저온합성
손세구, 이지현1, 이상훈2, 김영도
(주)예람 REEM 연구소
1강원대학교 환경공학과
2한양대학교 환경공학과 공과대학원
Low Temperature Synthesis of Forsterite Powders by the Geopolymer Technique
Se-Gu Son, Ji-Hyeon Lee1, Sang-Hoon Lee2, Young-Do Kim
YERAM REEM Research Center
1Department of Environmental Engineering, Kangwon National University
2Department of Environmental Engineering, Hanyang University
ABSTRACT
Forsterite is a crystalline magnesium silicate with chemical formula $Mg_2SiO_4$, which has extremely low electrical conductivity that makes it an ideal substrate material for electronics. In this study, forsterite precursors were synthesized with magnesium silicate gels from the mixture of magnesium nitrate solution and various sodium silicate solution by the geopolymer technique. Precursors and heattreated powders were characterized by thermogravimetrical differential thermal analyzer(TG-DTA), X-ray diffractometer(XRD), scanning electron microscopy(SEM), Si magic angle spinning nuclear magnetic resonance(MAS-NMR), transmission electron microscopy(TEM). As the result of analysis about the crystallization behavior by DTA, the synthesized precursors were crystallized in the temperature range of $700^{circ}C$ to $900^{circ}C$. The XRD results showed that the gel composition began to crystallize at various temperature. Also, it was found that the sodium orthosilicate based precursors(named as 'FO') began to crystallize at above $550^{circ}C$. The FO peaks were much stronger than sodium silicate solution based precursors(named as 'FW'), sodium metasilicate based precursors(named as 'FM') at $800^{circ}C$. TEM investigation revealed that the 100nm particle sized sample was obtained from FO by heating up to $800^{circ}C$.
Key words: Geopolymer technique, Forsterite, Nano size, Crystallization behavior
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