SiAlON is a ceramic alloy (solid solution of Si₃N₄-Al₂O₃) which is discovered in the early 1970s. Since then, SiAlON ceramics have been used for structural applications due to its excellent fracture toughness and strength, outstanding chemical stability, and wear resistance. However, this material has also an enormous potential for functional applications. In this study, the effects of co-dopants on the IR transmittance of α-SiAlON ceramics were investigated. Compositions were designed by using two different cation combinations (Dy³⁺-La³⁺) and (Y³⁺-La³⁺). Starting powder mixtures were sintered by means of spark plasma sintering (SPS) technique. Microstructure and phase characterization of the samples was carried out by scanning electron microscope (SEM) and X-ray diffraction (XRD), respectively. The infrared transmission of α-SiAlON ceramics was measured by Fourier transform infrared spectroscopy (FTIR) in the range of 2000–7000 cm⁻¹. The results were discussed according to the relationship between density, phase composition, microstructure, and optical properties.

SiAlON是一种陶瓷合金（Si ₃ N ₄ -Al ₂ O _3的固溶体），于1970年代初发现。从那时起，SiAlON陶瓷因其出色的断裂韧性和强度，出色的化学稳定性和耐磨性而被用于结构应用。但是，这种材料在功能应用方面也具有巨大潜力。在这项研究中，研究了共掺杂剂对α-SiAlON陶瓷红外透射率的影响。通过使用两种不同的阳离子组合（Dy ³⁺ -La ³⁺）和（Y ³⁺ -La ³⁺）。起始粉末混合物通过火花等离子体烧结（SPS）技术烧结。样品的显微结构和相表征分别通过扫描电子显微镜（SEM）和X射线衍射（XRD）进行。通过傅立叶变换红外光谱（FTIR）在2000–7000 cm ^-1范围内测量了α-SiAlON陶瓷的红外透射率。根据密度，相组成，微观结构和光学性质之间的关系讨论了结果。