A Gold(I) Oxide Double Perovskite: BaAuIO.

Oxide perovskites offer improved stability compared to halide perovskite compounds for optoelectronic applications. Here, we report the first gold-containing double perovskite, BaAuIO, and compare it to BaAgIO and BaNaIO. BaAuIO and BaAgIO exhibit a monoclinic distortion from the cubic perovskite structure possessed by BaNaIO and have similar lattice constants despite the nominally larger size of Au compared to Ag.