ISSN:
1434-6036
Keywords:
61.40D
;
61.55H
;
81.15G
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Thin films of Pt−Ir, Ag−Ir, Ag−Ni and Ag−Y were cocondensed onto sapphire substrates at room temperature. Their atomic structures were investigated by X-ray diffraction. Although the first three systems have endothermic heats of fusion we did not find any sign of decomposition in the Ir containing cocondensed films. Instead, homogeneous solid solutions with fcc structure were formed. For the Ag−Ni system we found partial decomposition. But even here, the solubilities of one component in the other were strongly enhanced with regard to thermodynamical equilibrium. The X-ray diffraction patterns indicate transitions of the two crystalline fcc phases into amorphous states for Ni-contents of about 70 at %. Homogeneous amorphous solid states can be prepared in the Ag−Y system, which has an exothermic heat of fusion. At higher substrate temperatures amorphous and crystalline phases tend to be in metastable equilibrium. The experimental results we present are very suitable to discuss the importance of special material parameters for the formation of amorphous states in cocondensation experiments.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01313057
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