- 著者
- Katsunori KOSUGE Atsushi YAMAZAKI Atsumu TSUNASHIMA Ryohei OTSUKA
- 出版者
- The Ceramic Society of Japan
- 雑誌
- Journal of the Ceramic Society of Japan (ISSN:09145400)
- 巻号頁・発行日
- vol.100, no.1159, pp.326-331, 1992-03-01 (Released:2010-08-06)
- 参考文献数
- 15
- 被引用文献数
- 32 59
In order to synthesize well-crystallized magadiite and kenyaite as a single phase in a short reaction time, amorphous silica was hydrothermally reacted with alkaline solutions in the temperature range from 150°C to 200°C. From a suspension containing SiO2 and NaOH with molar ratios of H2O/SiO2=18.5 and NaOH/SiO2=0.23, magadiite was formed after a reaction time of 48 h at 150°C or after 18h at 170°C. The formation of Na-kenyaite, however, required 6h at 200°C. Then, KOH and K2CO3 were used to lower the formation temperature of kenyaite. K-kenyaite was synthesized after 16h at 185°C from a suspension with molar ratios of H2O/SiO2=18.5 and KOH/SiO2=0.23. Furthermore, (Na, K)-kenyaite was formed after 48h at 150°C or after 24h at 170°C from suspensions with molar ratios of H2O/SiO2=18.5, NaOH/SiO2=0.23 and NaOH/K2CO3=0.95-23. Magadiite and kenyaite were formed through a difinite induction period after dissolution of amorphous silica.