Sputtering target, method of producing the target and method of fabricating an optical recording medium

摘要

A sputtering target for fabricating a recording layer of a phase-change type optical recording medium contains a compound or mixture including as constituent elements Ag, In, Te and Sb with the respective atomic percent (atom.%) of alpha , beta , gamma and delta thereof being in the relationship of 2 </= alpha </= 30, 3 </= beta </= 30, 10 </= gamma </= 50, 15 </= delta </= 83 and alpha + beta + gamma + delta = 100, and a method of producing the above sputtering target is provided. A phase-change type optical recording medium includes a recording layer containing as constituent elements Ag, In, Te and Sb with the respective atomic percent of alpha , beta , gamma , and delta thereof being in the relationship of 0 < alpha </= 30, 0 < beta </= 30, 10 </= gamma </= 50, 10 </= delta </= 80, and alpha + beta + gamma + delta = 100, and is capable of recording and erasing information by utilizing the phase changes of a recording material in the recording layer. A method of fabricating the above phase-change type optical recording medium is also provided.