Thermo-Dynamic Discussions for the Chalcogenide Films of Reversible Optical Disk

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Abstract
Thermodynamic discussions concerning the melt and solidification of binary and thernary chalcogenide films as well as the temperature distribution in a film during write-erase cycles are presented. For a reversible optical disk, a very high-rate temperature change (108°C/s) and a high-temperature gradient (8.5×106°C/cm), compared with the usual metal alloy experiments, were experienced. In a Se–Te (isomorphous) system, the Te concentration increases at the circumference due to segregation. Thus, an isomorphous system is not adequate for reversible memory materials. On the other hand, in an eutectic system, segregation has not occured and, thus, many cycle operation is possible.

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