57Fe Mössbauer and positron lifetime studies of Al-Cu-Fe quasicrystals

Autor:	C. S. Sundar, T N Sairam, C M Chittaranjan, K.P. Gopinathan
Rok vydání:	1997
Předmět:	Diffraction Materials science Positron Condensed matter physics Mechanics of Materials Phase (matter) Mössbauer spectroscopy Analytical chemistry Quasicrystal General Materials Science Positron annihilation
Zdroj:	Bulletin of Materials Science. 20:535-540
ISSN:	0973-7669 0250-4707
DOI:	10.1007/bf02744768
Popis:	Al61·4Cu22·7Fe15·9, Al63·2Cu21·8Fe15 and Al71Cu14Fe15 have been studied by Mossbauer, positron annihilation and X-ray diffraction techniques. The positron lifetime, measured as a function of temperature, in Al61·4Cu22·7Fe15·9 shows a two-step increase. This is found to be due to the dynamics of phasons associated with Al and Cu, having activation energies of 0·43 eV and 0·78 eV respectively. In the case of Al71Cu14Fe15, a phase transformation from the quasicrystalline-crystalline phase at ≈ 550°C is observed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f905f056bdb43934943338f6992d8ee9 https://doi.org/10.1007/bf02744768 Zobrazit plný text záznamu Full text from SpringerLink