The microstructure and crystallographic orientation relationship of CaF2–MgO eutectics produced for the first time were characterized by electron microscopy. The eutectic contains single-crystal MgO rods (∼0.7 μm in size, spaced ∼8 μm) oriented parallel to the cubic axis of a CaF2 matrix. The rods present low-energy 100}CaF2 //111}MgO interfaces. Light guiding was experimentally proved and considered for possible optical applications. Crack propagation was also studied to show the potential improvement in fracture toughness through crack deflection at the interfaces.
首次制备的 CaF2-MgO 共晶的微观结构和晶体取向关系由电子显微镜表征。共晶中含有平行于 CaF2 基体立方轴的单晶氧化镁棒(大小为 0.7 μm,间距为 8 μm)。晶棒呈现出低能100}CaF2 //111}MgO 界面。实验证明了光导作用,并考虑了可能的光学应用。此外,还研究了裂纹扩展,以显示通过界面上的裂纹偏转提高断裂韧性的潜力。