Patent ID: 8197711
Filing Date: 2012-06-12
Classification: C04B,C09K,G21K

Abstract:
1. A transparent polycrystalline optoceramic, single grains of which have a symmetric cubic structure, said cubic structure of said single grains being isotypic to that of pyrochlore or fluorite, or unambiguously derivable therefrom in crystal structure terms, with at least one optically active center selected from the group consisting of rare earth ions, transition metal ions and titanium ions, wherein the optoceramic has the following formula: wherein 0≦x≦1.1, 0≦y≦3, 0≦z≦1.6, and 3x+4y+5z=8, and wherein A is at least one trivalent rare earth cation and is selected from the group consisting of Y wherein the optoceramic has a rare earth ion content of more than 100 ppm.