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

Published online by Cambridge University Press:  01 January 2006

Krishanu Biswas ,
Puspendu Kumar Das  and
Kamanio Chattopadhyay
Krishanu Biswas*
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore 560012, India
Puspendu Kumar Das
Affiliation:
Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
Kamanio Chattopadhyay
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore, 560012, India
*
a)Address all correspondence to this author. e-mail: kris@met.iisc.ernet.in
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Abstract

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) to DO3 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.

Keywords

Pulsed laser deposition (PLD)Thin filmTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 1 , January 2006 , pp. 174 - 184
Copyright
Copyright © Materials Research Society 2006

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