Luminous glass ceramics

摘要

A luminous glass ceramic comprising, in percent by weight, the following components: wherein a total amount of SiO2 and P2O5 is 50-70 wt.%, a ratio of P2O5 to SiO2 is 0-0.18, a ratio of Al2O3 to SiO2 is 0.30-0.55, one or more rare earth elements are added to the glass ceramic on an oxide basis of 0.1-30 wt.% to an total amount of other components, Na2O component, K2O component, and PbO component are not essentially contained, and the glass ceramic has a thermal shock resistance ¦ DELTA t¦ DEG C of not less than 150, which is obtained by following equation, ¦ DELTA t¦=Äflexural strengthÜ x (1-ÄPoisson's ratioÜ)/(Äcoefficient of thermal expansionÜ x ÄYoung's modulusÜ).