ввCeramic scintillators are promising due to their potentially low cost. Here, we report on our study of Ce-doped ceramics. Typical garnet-type ceramics Gd_2.97Ce_0.03Al₂Ga₃O₁₂ was fabricated for the study from co-precipitated powders by high-temperature sintering in air. Its structure and composition are characterized using Scanning Electron Microscope (SEM) imaging, Transmission Electron Microscopy (TEM), Electron Energy Loss Spectroscopy (EELS), Electron Backscattered Diffraction (EBSD) mapping, X-Ray Diffraction (XRD) and X-ray Absorption Near Edge Structure (XANES) measurements. The spatial distribution of luminescence properties at the micro-level is studied using scanning confocal microscopy. Cerium segregation at the grain boundaries was revealed by compositional characterization and is in line with enhanced Ce³⁺ photoluminescence observed at the boundaries. Meanwhile, no excess partitioning of Ce⁴⁺ ions at the grain boundaries is observed. It is found that most of Ce ions in the ceramics are stabilized in the state Ce³⁺, what is encouraging in view of the further development of GAGG:Ce ceramics as a promising luminescence material for lighting and scintillator application.

由于其潜在的低成本，陶瓷闪烁体是有前途的。在这里，我们报告我们对铈掺杂陶瓷的研究。典型的石榴石型陶瓷Gd _2.97 Ce _0.03 Al ₂ Ga ₃ O ₁₂由共沉淀的粉末在空气中高温烧结制成的用于研究的材料。通过扫描电子显微镜（SEM）成像，透射电子显微镜（TEM），电子能量损失谱（EELS），电子背散射衍射（EBSD）映射，X射线衍射（XRD）和X射线吸收来表征其结构和组成近边缘结构（XANES）测量。使用扫描共聚焦显微镜研究了微观上的发光特性的空间分布。铈在晶界处的偏析通过成分表征得以揭示，并且与在晶界处观察到的增强的Ce ³⁺光致发光相符。同时，Ce ⁴⁺不会过度分配在晶界处观察到离子。发现陶瓷中的大多数Ce离子都稳定在Ce ³⁺态，鉴于GAGG：Ce陶瓷作为一种有希望的照明和闪烁体应用的发光材料的进一步发展，这是令人鼓舞的。