Transparent, mullite-containing glass-ceramics.

摘要

There is disclosed an improved, transparent, mullite glass-ceramic doped with CR<Sub>2</Sub>0<Sub>3</Sub> to fluoresce in the 650-900 nm, region of the spectrum and having an absorption peak centered at about 600 nm. The improvement is in the inclusion in the composition of 2-15% by weight of ZnO and sufficient MgO, if necessary, to provide at least 5% ZnO + MgO. The ZnO or ZnO-MgO components selectively shift the absorption peak centered at 600 nm. toward the lower (blue) end of the spectrum.