Development of Transparent Ceramic Scintillators by Electromagnetic Heating Using Far Infrared Rays

利用远红外线通过电磁加热生产石榴石型陶瓷散热器。将Y3Al5O12（YAG）的细粉末造粒，并将它们用作起始样品。利用28 GHz毫米波辐照空气中的YAG和LuAG样品。在样品表面的温度达到1600 ℃，30分钟。烧结的YAG陶瓷的密度为95%，相比的YAG晶体的理论密度。扫描电子显微镜（SEM）观察表明，烧结后的YAG陶瓷中气孔较少。结果表明，电磁加热对石榴石型陶瓷的致密化是有效的。烧结的YAG陶瓷是半透明的，但不是透明的。

Garnet type ceramic scintillators have been produced by electromagnetic heating using far infrared rays. Fine powders of Y3Al5O12 (YAG) were pelletized, and they were used as starting samples. 28 GHz millimeter wave was irradiated to YAG and LuAG samples in air. The temperature at the surface of samples reached to 1600 oC for 30 min. The density of sintered YAG ceramics was 95 %, compared to the theoretical density of the YAG crystal. The observation of scanning electron microscope (SEM) images revealed that there is few pore in sinterd YAG ceramics. The results obtained indicate that the electromagnetic heating is effective for the densification of garnet type ceramics. The sintered YAG ceramics was translucent, but not transparent.