Abstract:
It is to provide a silica glass containing TiO 2 , having a wide temperature range where wherein the coefficient of thermal expansion becomes is substantially zero. A silica glass containing TiO 2 , which has a TiO 2 concentration of from 3 to 10 mass%, a OH group concentration of at most 600 mass ppm and a Ti 3+ concentration of at most 70 mass ppm, characterized by having a fictive temperature of at most 1,200°C, a coefficient of thermal expansion from 0 to 100°C of 0±150 ppb/°C , and an internal transmittance T 400-700 per 1 mm thickness in a wavelength range of from 400 to 700 nm of at least 80%. A process for producing a silica glass containing TiO 2 , which comprises porous glass body formation step, F-doping step, oxygen treatment step, densification step and vitrification step.
Abstract:
A silica glass containing from 3 to 10 mass% of TiO 2 , which has a coefficient of thermal expansion from 0 to 100 °C, i.e. CTE 0 to 100 , of 0 ± 300 ppb/ °C and an internal transmittance per mm in thickness within a wavelength region of from 200 to 700 nm, i.e. T 200 to 700 , of at most 80%.
Abstract:
A glass article for use in Extreme Ultra Violet Lithography (EUVL) is provided. The glass article includes a silica-titania glass having a compositional gradient through the glass article, the compositional gradient being defined by the functions: [TiO 2 ] = (c + f(x,y,z)), and [SiO 2 ] = (100 - {c + f(x,y,z)} - δ(x,y,z) ) wherein [TiO 2 ] is the concentration of titania in wt.%, [SiO 2 ] is the concentration of silica in wt.%, c is the titania concentration in wt.% for a predetermined zero crossover temperature (T zc ), f(x,y,z) is a function in three-dimensional space that defines the difference in average composition of a volume element centered at the coordinates (x,y,z) with respect to c, and δ(x,y,z) is a function in three-dimensional space that defines the sum of all other components of a volume element centered at the coordinates (x,y,z).
Abstract:
Silica-titania glasses with small temperature variations in coefficient of thermal expansion over a wide range of zero-crossover temperatures and methods for making the glasses. The method includes a cooling protocol with controlled anneals over two different temperature regimes. A higher temperature controlled anneal may occur over a temperature interval from 750°C - 950°C or a sub-interval thereof. A lower temperature controlled anneal may occur over a temperature interval from 650°C - 875°C or a sub-interval thereof. The controlled anneals permit independent control over CTE slope and Tzc of silica-titania glasses. The independent control provides CTE slope and Tzc values for silica-titania glasses of fixed composition over ranges heretofore possible only through variations in composition.
Abstract:
To provide a blank of TiO2-SiO2 glass for a mirror substrate for use in EUV lithography, in which the need for adaptation to optimize the progression of the coefficient of thermal expansion, and consequently also the progression of the zero crossing temperature Tzc, is low, the TiO2-SiO2 glass has at a mean value of the fictive temperature Tf in the range between 920°C and 970°C a dependence of its zero crossing temperature Tzc on the fictive temperature Tf which, expressed as the differential quotient dTzc/dTf, is less than 0.3.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung von dotiertem Quarzglas, das aus Quarzsand oder Bergkristall zusammen mit Zusatzstoffen erschmolzen wird, wobei als Zusatzstoff zumindest Neodymaluminat (NdAlO 3 ) zugesetzt wird.