Patent ID: 7465686
Filing Date: 2008-12-16
Classification: C03C

Abstract:
1. A glass-ceramic containing a solid solution of β-quartz or of β-spodumene or solid solutions of β-quartz and β-spodumene, as main crystalline phase(s), the composition of which, expressed as percentages by weight of oxides, essentially consists of: and at least one oxide of a multivalent element selected from the group consisting of SnO 2 , V 2 O 5 , CeO 2 , MnO 2 and Fe 2 O 3 , wherein each respective one of said at least one multivalent element oxide comprises at least 0.15% of the glass-ceramic, such that the sum of said multivalent element oxide(s) comprises 0.2-2% of the glass ceramic, wherein SnO 2 , if included, comprises 0.15-0.7% of the glass-ceramic, and barium oxide is present in an amount up to 2%.