| 摘要 |
PURPOSE:To improve various properties such as C/N, erasing rate, moisture resistance and heat resistance of a recording film made of chalcogen compound by containing a recording film having a specific composition ratio of specific elements. CONSTITUTION:The concentrations of main ingredients Te-Ge-Sn of a recording film are represented by triangular coordinates. The coordinates of points A, B, C, D, E for specifying the ranges of the compositions are A(Te93, Ge5, Sn2), B(Te93, Ge2, Sn5), C(Te68, Ge2, Sn30), D(Te52, Ge18, Sn30), E(Te52, Ge46, Sn2), and the composition of the film is formed by adding 1-40at% of subingredient of an element Me selected from among Pd, Co, Cr to Te-Ge-Sn of main ingredients within a range surrounded by the ABCDE. Accordingly the composition of the film is represented by the following general formula. (Te.x Ge.y Sn.z)mMe-n, where x+y+z=100, m+n=100. |
