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Schwarzites are porous structures that present negative Gaussian curvatures.Although initially proposed for carbon, in principle, schwarzites of otherelements are possible. In this work, we have carried out a detailedinvestigation of the effect of element composition (C, Ge, Si, SiC, and BN) onthe structural, electronic and optical properties of a gyroid schwarzitestructure, the so-called G688. The DFT simulations were carried out using thewell-known SIESTA code. Our results showed that formation energy values are insimilar range of other related allotrope structures and are thermally stable(up to 1000~K). From the electronic analyses, our results indicate that allstructures, except the carbon one, present semiconductor characteristics. Fromthe optical properties, except for the infrared region where only silicon andgermanium show some absorption, the other structures exhibit optical activityonly in the visible and ultra-violet regions, and all of them have largerefractive index values. For reflectivity, except for Si and Ge schwarzitesthat reflect almost 40\% of light, the other schwarzites exhibit lowreflectivity. These characteristics make them good candidates foroptoelectronic applications, such as infrared/ultraviolet absorbers, andultraviolet blockers.

The Effect of Element Composition on the Structural and Electronic  Properties of Carbon, Silicon, Silicon Carbide, and Boron Nitride Gyroid  Schwarzites