Active opto-ceramics having a cubic crystal structure, their preparation and uses

It introduces opto-ceramics with high transmittance, high density and high effective atomic number. The opto-ceramics doped with activator elements. The materials are capable of absorbing high energy radiation and convert it into visible light photons. The materials are therefore suitable for example as scintillation for z. As medical imaging (CT, PET, SPECT or combined PET / CT systems), security (X-ray detection devices) or serve the object tracking or reconnaissance (exploration, mineral development). The materials of the invention forming Kristallitkorner have a cubic crystal structure - point and space group, and atomic layers isotypic to that of the minerals pyrochlore or fluorite - on or are crystal structurally clearly mentioned by the two derived and have the following stoichiometry A -1.15 ≦ x ≦ 0 and 0 ≦ y ≦ 3 and 0 ≦ z ≦ 1.6 as well as 3x + 4y + 5z = 8 and wherein A is a trivalent cation from the group of rare earth ions, B is at least one tetravalent cation, D is at least one pentavalent cation and E is at least at least one divalent anion.