Reducing the grain size of polycrystalline lead films by the use of nucleants
- 1 July 1982
- journal article
- conference paper
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 53 (7) , 4919-4927
- https://doi.org/10.1063/1.331325
Abstract
Thin layers of La, Y, Au, Pd, Pt, Ag, and Sn were evaporated at room temperature as nucleants prior to the evaporation of 2000 Å Pb. The correlations of grain size, surface morphology, and the phase diagrams of lead nucleant showed that the grain size of lead was reduced only if the nucleant formed a compound with lead and a eutectic between the compound and lead. In such a case the surface morphology was hemispherical, indicating that crystallization from the vapor took place through the liquid phase. The various sources of undercooling explaining the presence of the liquid phase are discussed. It is shown that the necessary condition for heterogeneous nucleation is the same as the condition for lamellar or rodlike eutectic growth; therefore, the occurrence of such eutectic in the phase diagram indeed indicates the possibility of heterogeneous nucleation. A vapor-liquid-heterogeneous nucleation mechanism of crystallization is suggested. Factors affecting the surface morphology of nucleated films are discussed.This publication has 18 references indexed in Scilit:
- Thermal stability of Pb-alloy Josephson junction electrode materials. III. Correlation of microstructure and strain in Pb-In-Au base electrodesJournal of Applied Physics, 1982
- High-reliability Pb-alloy Josephson junctions for integrated circuitsIEEE Transactions on Electron Devices, 1980
- Hillock formation in lead films by grain boundary slidingPhilosophical Magazine A, 1980
- Thermal strain in lead thin films VI: Effects of oxygen dopingThin Solid Films, 1980
- Yield stress of thin f.c.c. polycrystalline metal films bonded to rigid substratesPhilosophical Magazine A, 1979
- The lead-rich region of the lead-palladium equilibrium diagramMetallurgical Transactions B, 1977
- Thin-film reactions of Pb with AgAu and AgPd alloysJournal of Applied Physics, 1975
- The solid-liquid interfacial free energy of lead from supercooling dataPhilosophical Magazine, 1970
- Prenucleation of Lead Films with Copper, Gold, and SilverIBM Journal of Research and Development, 1963
- Formation of Crystal Nuclei in Liquid MetalsJournal of Applied Physics, 1950