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Optical Ceramics Market: Outlook 2027 & Key Trends Optical ceramics are one of the many types of transparent ceramics. They are transparent polycrystalline materials which can replace single crystal scintillators. Polycrystalline materials are solids composed of crystallites divided by grain borders, which are areas of relative disorder. Optical ceramics are high-tech industrial materials with optical applications. Optical ceramics have the advantage of being able to generate low-cost, large-scale materials for large-area detection.