Eurokera

Thiphaine Ogier

Philippe Lehuede

Marie J Comte

The present application provides transparent glass-ceramics of &#x3b2;-quartz of composition containing a small content of lithium, articles constituted at least in part of said glass-ceramics, glasses precursors of said glass-ceramics, and also a method of preparing said articles. Said glass-ceramics have a composition, free of arsenic oxide and antimony oxide, except for inevitable traces, expressed as percentages by weight of oxides, containing: 62% to 68% of SiO; 17% to 21% of AIO; 1% to &#x3c;2% of LiO; 1% to 4% of MgO; 1% to 6% of ZnO; 0 to 4% of BaO; 0 to 4% of SrO; 0 to 1% of CaO; 1% to 5% of TiO; 0 to 2% of ZrO; 0 to 1% of NaO; 0 to 1% of KO; with NaO+KO+BaO+SrO+CaO&#x3c;6%; optionally up to 2% of at least one fining agent comprising SnO; and optionally up to 2% of at least one coloring agent.

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Paris, France

Thiphaine Ogier