New Ga doped GeSb based phase-change materials are investigated. These materials possess good optical contrast at short wavelengths. Crystallization temperature increasing and grain size refinement are obtained by addition of Ga. More than 50 dB CNR and 25 dB erasability are measured in disks using blue laser.
Thin polyimide films, prepared by vacuum deposition, have been investigated. The influence of the nature of the monomers, evaporation rate, treatment of the substrate and post- preparation treatment (imidization) of the layers on the structure are discussed. Infrared spectra and thermogravimetric analysis results are consistent with the interpretation that VDP films produced are polyamic acid curable to polyimide. The morphology and properties have been characterized by electron microscopy.
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