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Fine-grained Ce,Y:SrHfO3Scintillation CeramicsFabricated by Hot Isostatic Pressing

Ce:SrHfO3 ceramics possess a strong stopping power to high-energy rays due to their high density and high effective atomic number. In addition, they also have excellent scintillation properties such as short decay time and high energy resolution, which have attracted great attention from researchers. However, it is difficult to obtain transparent Ce:SrHfO3 ceramics via traditional sintering method because of its orthogonal structure. In this work, Ce,Y:SrHfO3 ceramics were prepared by long-time vacuum sintering and short-time vacuum pre-sintering combined with hot isostatic pressing (HIP). The Ce,Y:SrHfO3 powders with a pure phase and a mean particle size of 152 nm were prepared by calcining at 1200 °C for 8 h using metal oxides and carbonates. The Ce,Y:SrHfO3 ceramics vacuum-sintered at 1800 °C for 20 h are opaque with an average grain size of 28.6 μm, while those prepared by the two-step sintering method show good optical transmittance. The evolution of the microstructure in the process of densification was analyzed in detail, and the influence of the pre-sintering temperature on the density, microstructure and optical transparency of Ce,Y:SrHfO3 ceramics was studied. The Ce,Y:SrHfO3 ceramics pre-sintered at 1500 °C for 2 h with HIP post-treatment at 1800 °C for 3 h have the highest in-line transmittance of 21.6% at 800 nm with a far smaller average grain size of 3.4 μm. Under X-ray excitation, the Ce 5d-4f emission of Ce,Y:SrHfO3 ceramics was observed at 400 nm and the XEL integral intensity is 3.3 times higher than that of BGO crystals. The light yield of the Ce,Y:SrHfO3 ceramics is approximately 3700 ph/MeV with the shaping time of 1 μs. Good optical quality and scintillation performance will expand the application range and potential of Ce,Y:SrHfO3 ceramics in the field of scintillation detection.