Superionic and electride behaviors in materials, which induce a variety of exotic physical properties of ions and electrons, are of great importance both in fundamental research and for practical applications. However, their coexistence in hot alkali-metal borides has not been observed. In this work, we apply first-principles structure search calculations to identify eight Na–B compounds with host–guest structures, which exhibit a wide range of building blocks and interesting properties linked to the Na/B composition. Among the known borides, Na-rich Na₉B stands out as the composition with the highest alkali-metal content, featuring vertex- and face-sharing BNa₁₆ polyhedra. Notably, it exhibits electride characteristics and transforms into a superionic electride at 200 GPa and 2000 K, displaying unusual Na atomic diffusion behavior attributed to the modulation of the interstitial anion electrons. It demonstrates semiconductor behavior in the solid state, and metallic properties associated with Na 3p/3s states in the superionic and liquid regions. On the other hand, B-rich NaB₇, consisting of a unique covalent B framework, is predicted to exhibit low-frequency phonon-mediated superconductivity with a T_c of 16.8 K at 55 GPa. Our work advances the understanding of the structures and properties of alkali-metal borides.

光切片图像的质量与使用的重构算法直接相关，传统的均方根算法虽然简洁，但在原始图像信噪比和条纹对比度不高时重构效果不佳，得到的三维重建结果并不理想。针对该问题，提出一种去背景和去卷积相结合的光切片方法。与传统均方根算法相比，该方法能有效减少残留条纹，提高微小细节的可见性。实验搭建了一套基于数字微镜器件的结构照明显微系统，以小鼠肾脏细胞、牛肺动脉内皮细胞等为样品进行了光切片实验。实验结果表明，该方法能获得更好的光切片和三维成像效果。