| http://www.w3.org/ns/prov#value | - A film structure of an erasable optical disk is a three-layer structure such that a dielectric film layer composed of an oxide or a sulfide or a mixture of these compounds, e.g. a ZnS film, a SiO2 film, or a ZnS--SiO2 mixture film, a recording layer composed of a Te-based alloy mentioned above, and a second dielectric film layer are successively deposited on a transparent substrate of resin or gla
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