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CRYSTAL STRUCTURE AND RIETVELD REFINEMENT OF ZEOLITE A SYNTHESIZED FROM FINE-GRAINED PERLITE WASTE MATERIALS

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CRYSTAL STRUCTURE AND RIETVELD REFINEMENT OF ZEOLITE A SYNTHESIZED FROM FINE-GRAINED PERLITE WASTE MATERIALS (EN)
Christidis, G.
Perdikatsis, V.
Psycharis, V.
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
2004-01-01
Synthetic zeolites have been produced from a variety of natural silica-rich rocks including volcanic glasses, such as perlite and pumice. The Zeolite studied in this work has been synthesized from perlite and expanded perlite fines. Detailed powder X-ray diffraction studies determined it as Zeolite A. In early studies the structure of Zeolite-Α was described with a cubic cell with a=12.3 A and space group Pm-3m. However the observation of the (531) reflection indicates that a F lattice with a larger cell of 24.60 A gives a more accurate description. Two end products were studied on the basis of the degree of crystallization of the parent gels to zeolite A . One end product was characterized by total conversion of the incipient gel to zeolite A with high degree of crystallinity, whereas in the second a substantial amount of the original gel did not crystallize out and zeolite A coexisted with amorphous material. The former resulted from gels with S1O2/AI2O3 molar ratio 2:1 and 5 hours reaction time and the latter from gels with SÌO2/AI2O3 molar ratio of 2.5:1 and 3 hours reaction time. The X-ray powder diffraction data recorded from the former sample were used for the analysis of the crystal structure of zeolite A and the final model was refined by the Rietveld method. (EN)
Δελτίο της Ελληνικής Γεωλογικής Εταιρίας
English
Geological Society of Greece (EN)
0438-9557
2529-1718
Δελτίο της Ελληνικής Γεωλογικής Εταιρείας; Τόμ. 36 Αρ. 1 (2004): 10o διεθνές Συνέδριο της ΕΓΕ; 121-129 (EL)
Bulletin of the Geological Society of Greece; Vol. 36 No. 1 (2004): 10th International Conference of the Geological Society of Greece; 121-129 (EN)
Copyright (c) 2018 V. Psycharis, V. Perdikatsis, G. Christidis (EN)
https://creativecommons.org/licenses/by-nc/4.0
Geological Society of Greece
Bulletin of the Geological Society of Greece
Industrial Minerals and Rocks



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