Free-volume defects and microstructure in ion-conducting Ag/AgI-As(2)S(3) glasses as revealed from positron annihilation and microhardness measurements
Artykuł w czasopiśmie
| Status: | |
| Autorzy: | Kavetskyy Taras, Borc Jarosław, Petkov Plamen, Kolev Kolyo G., Petkova T. |
| Rok wydania: | 2011 |
| Wersja dokumentu: | Elektroniczna |
| Język: | angielski |
| Numer czasopisma: | 1 |
| Wolumen/Tom: | 183 |
| Strony: | 16 - 19 |
| Impact Factor: | 2,646 |
| Web of Science® Times Cited: | 6 |
| Scopus® Cytowania: | 7 |
| Bazy: | Web of Science | Scopus |
| Efekt badań statutowych | NIE |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | NIE |
| Abstrakty: | angielski |
| he positron annihilation lifetime spectroscopy (PALS) study and load dependent Vickers microhardness data were applied together to find correlation between free-volume defects and microstructure in the pure As(2)S(3) and metal-modified (As(2)S(3))(85)Ag(15) and (As(2)S(3))(85)(AgI)(15) glasses. The PALS data were analyzed by the well-developed formalism of the two-state positron trapping model while microhardness data were analyzed according to the strain-gradient plasticity theory presented in the form: H=H(0)(1 + d(0)/d), where H(0) is the load independent hardness and d(0) is a constant. Analysis of the experimental results showed that: (1) the hole-like defects with volume larger than or comparable with the size of the Ag(+) ions but smaller than the size of the AgI clusters are present in the structure of the host glass matrix As(2)S(3) and are effective positron traps, and (2) these free-volume defects determine the load-independent indentation microhardness H(0) of a glass in the region of applied load where the H(v) decreases with an increase in the applied load P. (C) 2010 Elsevier BM. All rights reserved. |
