Microstructural evolution in laser-ablation-deposited Fe-25 at.% Ge thin film

Biswas, Krishanu ; Das, P. K. ; Chattopadhyay, Kamanio (2006) Microstructural evolution in laser-ablation-deposited Fe-25 at.% Ge thin film Journal of Materials Research, 219 (1). pp. 174-184. ISSN 0884-2914

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Related URL: http://dx.doi.org/10.1557/JMR.2006.0023


Films with Fe-25 at.% Ge composition are deposited by the process of laser ablation on single crystal NaCl and Cu substrates at room temperature. Both the vapor and liquid droplets generated in this process are quenched on the substrate. The microstructures of the embedded droplets show size as well as composition dependence. The hierarchy of phase evolution from amorphous to body-centered cubic (bcc) DO3 to has been observed as a function of size. Some of the medium-sized droplets also show direct formation of ordered DO19 phase from the starting liquid. The evolution of disordered bcc structure in some of the droplets indicates disorder trapping during liquid to solid transformation. The microstructural evolution is analyzed on the basis of heat transfer mechanisms and continuous growth model in the solidifying droplets.

Item Type:Article
Source:Copyright of this article belongs to Materials Research Society.
ID Code:6550
Deposited On:21 Oct 2010 04:33
Last Modified:16 May 2016 16:52

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