Formation of .BETA.-quartz Solid Solution from Zn-Exchanged Zeolite A

Autor:	Yuji Hiraki, Yoshiaki Goto, Taiji Matsumoto
Rok vydání:	2001
Předmět:	Materials science Ion exchange Inorganic chemistry chemistry.chemical_element Mullite General Chemistry Zinc Condensed Matter Physics Amorphous solid Thermogravimetry chemistry Aluminosilicate Materials Chemistry Ceramics and Composites Zeolite Solid solution
Zdroj:	Journal of the Ceramic Society of Japan. 109:637-639
ISSN:	1882-1022 0914-5400
DOI:	10.2109/jcersj.109.1271_637
Popis:	β-quartz solid solution consisting of zinc aluminocilicate was prepared from a Zn-exchanged zeolite A (Zn-A) as a precursor. In the thermal-transformation process of Zn-A, two kinds of β-quartz solid solutions were obtained. Zn-A became an amorphous material upon heating at 873K. The β-quartz solid solution (β-Qss (Z)), which has a composition close to that of Zn-A (ZnAl2Si2O8), formed with the presence of small amounts of gahnite and mullite from the amorphous material at temperatures above 1163K. The β-Qss (Z) decomposed at temperatures above 1223K and then another β-quartz solid solution (β-Qss (S)) formed. The composition of β-Qss (S) was richer in SiO2 than that of β-Qss (Z). The d value in the (101) plane of β-Qss (S) decreased with increasing heating temperature, which suggested that the amounts of Al and Zn in the specimen decreased and that β-Qss (S), formed above 1573K, has the composition of nearly pure SiO2.
Databáze:	OpenAIRE
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