S. Kondo et al., Amorphous Tl1-xCuiCl solid solution and their crystallization studied by optical absorption spectroscopy, MAT SCI E B, 78(2-3), 2000, pp. 90-95
Amorphous solid solutions are obtainable for the binary Tl1-xCuxCl system b
y means of two-sources evaporation onto 77 K substrates. Their annealing be
havior has been studied for a him with x similar to0.4 by optical absorptio
n spectroscopy. In the as-prepared film an appreciable amount of Cu 3d stat
es is localized with the energies lying above the upper valence bands. On a
nnealing the him, Cu+ ions migrate to form clusters in the amorphous enviro
nment, with their size depending on the annealing temperature. The lowest a
nnealing temperature at which the clusters are formed lies near the crystal
lization temperature of amorphous CuCl. On further annealing at higher temp
eratures, the clusters grow until the amorphous environment has a particula
r atomic composition ratio suggestive of a new, novel compound, which exhib
its a well defined crystallization temperature, 300 K. (C) 2000 Elsevier Sc
ience S.A. All rights reserved.