High pressure Mossbauer studies of stable quasicrystal Al63.5Cu24Fe12.5

Gupta, Ajay ; Paul, Neelima ; Vijaykumar, V. ; Godwal, B. K. (2004) High pressure Mossbauer studies of stable quasicrystal Al63.5Cu24Fe12.5 Journal of Non-Crystalline Solids, 334-335 . pp. 243-246. ISSN 0022-3093

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00223...

Related URL: http://dx.doi.org/10.1016/j.jnoncrysol.2003.11.050


The effect of high pressure on the short-range order in the stable Al63.5Cu24Fe12.5 quasicrystal has been studied using Mössbauer spectroscopy. In agreement with the earlier studies, the system shows no structural transition up to the highest pressure of 24.2 GPa used in the present study. Variations in both the isomer shift (IS) and the quadrupole splitting (QS) of two non-equivalent iron sites with pressure suggest changes in the short-range order in the system. A linear variation of IS with pressure can be understood in terms of the compressibility of the structure around the Fe atoms. An increase in the quadrupole splitting with pressure suggests that in addition to the compression, a distortion of the local arrangement of Al atoms around an Fe atom also takes place. At 24.2 GPa, the Mossbauer lines exhibit significant broadening, indicating an increase in the static disorder in the system with pressure.

Item Type:Article
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ID Code:11785
Deposited On:13 Nov 2010 13:54
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