Investigation on morphological stability of ultrathin Pb films

Zhang, L. H.; Sui, M. L.; Zhang, L.; Hu, K. Y.; Li, D. X.
June 2001
Applied Physics Letters;6/4/2001, Vol. 78 Issue 23, p3621
Academic Journal
Ultrathin Pb films supported by Al film were made by using cold-rolling and ion-beam thinning techniques. The morphological instability of the Pb film under electron-beam irradiation was investigated by means of in situ transmission electron microscopy observations. It has been found that under electron-beam irradiation, Pb films with an incoherent Pb/Al interface spheroidized into Pb particles, but those with a semicoherent Pb/Al interface were stable in morphology. The morphological stability of thin films depends on the microstructure and the thermodynamic property of the interphase boundary. A critical interfacial energy for the spheroidization of thin films was determined based on a thermodynamics analysis. © 2001 American Institute of Physics.


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