| 摘要 |
The present invention provides an optical information recording medium having excellent characteristics in repetitive recording and a sufficient C/N ratio. The optical information recording medium includes a recording layer containing Ge, Te and Sb and a diffusion preventing layers in contact with the recording layer. A composition ratio of Ge, Te and Sb in the recording layer has numerical values which lie within the range represented by the area ABCDE in a ternary phase diagram of Ge, Te and Sb, where the points A, B, C, D and E are as follows: A (Ge50Te50), B (Ge22.5Sb22.0Te55.5), C (Ge17.0Sb41.5Te41.5), D (Ge48.0Sb26.0Te26.0), E (Ge65Te35> The diffusion layer contains at least one compound selected from an oxide, a nitride, a nitrogen oxide, a carbide and a fluoride. <IMAGE> |
