MBE Alloy Clustering Kinetics - a Stochastic Model Study
Document Type
Conference Proceeding
Publication Date
1991
Publication Title
Proceedings of the Materials Research Society
Publisher
Materials Research Society
Volume
220
First page number:
129
Last page number:
134
Abstract
A theoretical study of alloy clustering in an hypothetical diamond cubic alloy, ao.5bo.s in which thermodynamics favors phase separation is performed based on a master equation approach. The a-b atom pair interaction is assumed weaker and repulsive (-0.25 eV). It is shown that below 375°C, due to negligible surface migration, there is no clustering of the alloy, but, the surface roughness is very large. In the intermediate temperature range of 300 -6250C, with increasing temperature, surface migration increases, resulting in more clustering and decreased surface roughness. Above 5000C, due to very high surface migration, complete phase separation and smooth surface result. It is shown that the conventional MBE growth techniques are incompatible with the growth of good quality heterostructures which consist of alloys having large poistive enthalpy of mixing.
Keywords
Crystal growth; Heterostructures; Mechanics; Analytic; Molecular beam epitaxy
Repository Citation
Venkat, R.,
Khoie, R.
(1991).
MBE Alloy Clustering Kinetics - a Stochastic Model Study.
Proceedings of the Materials Research Society, 220
129-134.
Materials Research Society.
https://digitalscholarship.unlv.edu/ece_fac_articles/69