| 摘要 |
PROBLEM TO BE SOLVED: To provide a silica-titania glass having a long-term durability in which densification upon X-ray irradiation is particularly suppressed and a method for producing the same.SOLUTION: A method for producing a silica-titania glass comprising: a) a step of synthesizing a silica-titania glass containing 5 to 9 wt% of TiOfrom a Si raw material and a Ti raw material; b) a step of heating the silica-titania glass obtained in the step a) at the temperature of higher than 2150°C; and c) a step of annealing the silica-titania glass obtained in the step b) at 700 to 1300°C, in which a tensile-stress F in a test sample of the silica-titania glass after the step c) partially irradiated with X-ray generated under specific condition caused between irradiation-area and non-irradiaition area is within a range of F<0.06×C(TiO)...(1) [C(TiO) represents TiOconcentration (wt%)]. |
