| 摘要 |
The invention provides a method for producing a glass ceramic comprising the steps of melting a starting glass that is free from alkali, except for incidental contamination, and that contains at least one garnet-forming agent and at least one oxide of a lanthanoid; grinding the starting glass to produce a glass frit; molding by pressing and sintering the glass frit until at least one garnet phase containing lanthanoids is formed. A glass ceramic produced in this way may contain 5-50 % by weight of SiO<SUB>2</SUB>, 5-50 % by weight of Al<SUB>2</SUB>O<SUB>3 </SUB>and 10-80 % by weight of at least one oxide selected from the group formed by Y<SUB>2</SUB>O<SUB>3</SUB>, Lu<SUB>2</SUB>O<SUB>3</SUB>, Sc<SUB>2</SUB>O<SUB>3</SUB>, Gd<SUB>2</SUB>O<SUB>3</SUB>, Yb<SUB>2</SUB>O<SUB>3</SUB>, Ce<SUB>2</SUB>O<SUB>3</SUB>, as well least one oxide selected from the group formed by B<SUB>2</SUB>O<SUB>3</SUB>, Th<SUB>2</SUB>O<SUB>3</SUB>, and oxides of the lanthanoids, except Lu<SUB>2</SUB>O<SUB>3</SUB>, Gd<SUB>2</SUB>O<SUB>3</SUB>, Yb<SUB>2</SUB>O<SUB>3</SUB>, Ce<SUB>2</SUB>O<SUB>3</SUB>. Such a glass ceramic is suited especially for down conversion of excitation radiation in the blue and in the UV region of the spectrum.
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