Microscopic description of strain-reducing chemical bonding self-organizations in non-crystalline alloys



Alloy compositions for a first transition (1) into, and a second transition (2) out of intermediate phases (IPs) have been identified (i) by Boolchand and co-workers in bulk glasses, primarily by low values for the change in enthalpy, ΔHnr, for non-reversible heat flow at the glass transition temperature, and (ii) by Lucovsky and coworkers in deposited thin film by combining spectrographic and electrical studies. This paper emphasizes chemical bonding self-organizations that minimize macroscopic strain within IP windows, identifying necessary and sufficient conditions for IP windows to open, and to close. Percolation theory, competitive and synergistic double percolation, provide a framework for determining alloy compositions for the first and second transitions of IP windows in bulk glasses and thin films as well. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)