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Based on density functional calculation with LDA+U method, we propose thathypothetical Osmium compounds such as CaOs2O4 and SrOs2O4 can be stabilized inthe geometrically frustrated spinel crystal structure. They also show someexotic electronic and magnetic properties in a reasonable range of on-siteCoulomb correlation U such as ferromagnetism and orbital magnetoelectric effectcharacteristic to Axion electrodynamics. Other electronic phases including 3DDirac metal and Mott insulator exist and would make perspective 5d spinelsideal for applications.

Computational Design of Axion Insulators Based on 5d Spinels Compounds