Ag alloy reflective layer for optical information recording medium, optical information recording medium, and sputtering target for forming Ag alloy reflective layer for optical information recording medium

摘要

An Ag alloy reflective layer for optical information recording medium having excellent environmental resistance, an optical information recording medium having such Ag alloy reflective layer, and the like are provided. This Ag alloy reflective layer for an optical information includes 0.1 to 5 atomic % in total of at least one element selected from W, Ti, V, Mn, Zr, Cr, and Ni; 0.005 to 1 atomic % of Bi; and the residue of Ag and inevitable impurities. As a consequence, this Ag alloy reflective layer has improved environmental resistance including the light resistance for the light beam of particular wavelength and resistance to moist heat under particular set of conditions.