| 摘要 |
PURPOSE:To provide a spectral reflectance variable alloy suitable for a recording medium by adding the selected third element at a specific ratio to a binary system of Fe-Zn or Fe-Al and cooling quickly the same from a molten metal. CONSTITUTION:The spectral reflectance variable alloy consists of one of 15-45wt% Fe and Zn and 35-50% Al and <=15% >=1 kinds selected from groups of IA, IIA, IVA, VA, VIA, VIIA, VIII, IB, IIB, IIIB, IVB, VB and rare earths. This alloy has the crystal structure different at the 1st temp. higher than a room temp. and the 2nd temp. lower than said temp. in a solid soln. state. More specifically, the alloy has the crystal structure different from the crystal structure by non-quick cooling at the low temp. when the alloy is quickly cooled from the high temp. The alloy has >=2 kinds of spectral reflectances at the same temp. and can be reversibly changed in the spectral rate when subjected to a heating treatment in a solid phase state. The alloy is used for the recording material by cooling quickly and solidifying the material from a vapor phase or directly from the liquid phase and forming the same into a non-bulk state, etc. |
