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Apparent Scarcity of Low-Density Polymorphs of Inorganic Solids

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For most inorganic solids, very few dense polymorphs and no low-density polymorphs are observed. Taking a wide range of tetrahedrally-coordinated binary solids (e.g., ZnO, GaN) as a prototypical system, we show that the apparent scarcity of low- density polymorphs is not due to significant structural or energetic limitations. Using databases of periodic networks as sources of novel crystal structures, followed by ab initio energy minimization, we predict a dense spectrum of low-density low-energy polymorphs. The diverse range of materials considered indicates that this is likely to be a general phenomenon.

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Articles publicats en revistes (Ciència dels Materials i Química Física)

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Apparent Scarcity of Low-Density Polymorphs of Inorganic Solids