Naslov
Positron and positronium annihilation patterns in zeolites and bulk ceramics

Autori
Kajcsos, Zsolt ; Kosanović, Cleo ; Liszkay, Laszlo ; Major, Peter ; Lohonyai, Laszlo ; Zalan, Peter ; Lazar, Karoly ; Bosnar, Sanja ; Subotić, Boris ; Bosnar, Damir ; Havenscak, Karoly ; Gordo, PM ; Tomašić, Nenad

Izvornik
Physica status solidi. C, Current topics in solid state physics (1862-6351) 4 (2007); 3810-3813

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
positron annihilation; positron lifetime; zeollites; bulk ceramics; crystallization; free volume; gel ageing; positronium formation

Sažetak
In porous media, positron annihilation techniques (PAT) revealed the existence of annihilation modi with long lifetimes connected to structural and extrastructural free volumes acting as trapping centres for o-Ps. Our aim in this work was to study the influence of the synthesis applied for the production of the zeolite framework and the correlation between the trapping pattern and crystallization progress. PAT lifetime (LT) measurements were performed in silicalite-1 samples in various stages of crystallization and a large change was observed in the long components. The results are discussed in connection to the crystallization and the availability of free volume.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

Napomena
Sv. 607 : Positron and Positronium Chemistry : Selected, peer reviewed papers from 9th International Workshop on Positron and Positronium Chemistry, May 11-15, 2008, Wuhan University, China ; S. J. Wang, Z. Q. Chen, B. Wang and Y. C. Jean (Eds.) ; ISBN 978-0-87849-348-7.

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