PHASE STABLE RARE EARTH GARNETS

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A transparent ceramic according to one embodiment includes a rare earth garnet comprising AhBiCjO12, where h is 3±10%, i is 2±10%, and j is 3±10%. A includes a rare earth element or a mixture of rare earth elements, B includes at least one of aluminum, gallium and scandium, and C includes at least one of aluminum, gallium and scandium, where A is at a dodecahedral site of the garnet, B is at an octahedral site of the garnet, and C is at a tetrahedral site of the garnet. In one embodiment, the rare earth garment has scintillation properties. A radiation detector in one embodiment includes a transparent ceramic as described above and a photo detector optically coupled to the rare earth garnet.