Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Thermal collapse of SAPO-34 molecular sieve towards a perfect glass
Δημιουργός/Συγγραφέας:	Wondraczek L. Gao G. Möncke D. Selvam T. Kuhnt A. Schwieger W. [EL] Παλλές, Δημήτρης[EN] Palles, Dimitris [EL] Καμίτσος, Ευστράτιος Ι.[EN] Kamitsos, Efstratios I.
Ημερομηνία:	2013
Γλώσσα:	Αγγλικά
ISSN:	0022-3093
DOI:	10.1016/j.jnoncrysol.2012.10.001
Περίληψη:	Controlled collapse of a silicoaluminophosphate molecular sieve CHA-type SAPO-34 by thermal aging was studied in a multi-method approach. Structural changes and the mechanism of order-disorder-order transitions during collapse were followed for varying annealing conditions between 1000 and 1100 °C. Collapse of SAPO-34 occurs via the formation of an intermediate amorphous state by the loss of long-range order but preservation to a high degree of short-range order and macroscopic morphology. This intermediate amorphous state with low entropy may be classified as a perfect glass. Prolonged aging in the collapse regime results in the precipitation of crystalline AlPO4 while the SiO2 species initially remain in an amorphous phase. Further increasing the aging temperature leads to virtually complete recrystallization and, ultimately, melting.
Τίτλος πηγής δημοσίευσης:	Journal of Non-Crystalline Solids
Τόμος/Κεφάλαιο:	360
Τεύχος:	1
Σελίδες:	36-40
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
Λέξεις-Κλειδιά:	Collapse Recrystallization SAPO-34 Thermal aging Zeolite
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2012 Elsevier B.V. All rights reserved.
Σημειώσεις:	Deutsche Forschungsgemeinschaft, DFG The authors gratefully acknowledge the financial support by the German Science Foundation (DFG) through the Cluster of Excellence “Engineering of Advanced Materials” — EAM, and also the research program FORETA within the “Klimaprogramm Bayern 2020” of the Bavarian State Government .
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο