Patent ID: 8198201

Claim:
A transparent glass-ceramic, including vanadium oxide, containing a solid solution of β-quartz as a main crystal phase, comprising: an optical transmission, for any wavelength between 1000 and 2500 nm, of greater than 50% for a thickness of 3 mm; an integrated transmission Y, in the visible range between 380 and 780 nm, measured with an illuminant C, of between 1.5% and 5%, for a thickness of 3 mm; and an optical transmission, for any wavelength between 450 and 480 nm, of greater than 0.5% for a thickness of 3 mm, wherein a composition of the glass-ceramic includes vanadium oxide, cobalt oxide, and less than 0.02% by weight of nickel oxide, and contains, as a refining agent, SnO 2 and vanadium oxide in an amount of 0.01% to 0.04% by weight.