Crystal structure built from a GeO$_6$-GeO$_5$ polyhedra network with high thermal stability: $\beta$-SrGe$_2$O$_5$

By tackling the challenge of extending transparent oxide semiconductors to Ge based oxides, we have found a not-yet-reported crystal structure, named $β$ -SrGe $_{2}$ O $_{5}$ , which is composed of edge-sharing GeO $_{6}$ octahedra interconnected by GeO $_{5}$ bipyramids. Single crystals were successfully grown by the high-pressure flux method. $β$ -SrGe $_{2}$ O $_{5}$ has a band gap of 5.2 eV and a dispersive conduction band with an effective mass as small as 0.34 times the electron rest mass, which originates from the edge-sharing GeO $_{6}$ octahedra network. Although known compounds with octahedral GeO $_{6}$ coordination are commonly unstable at atmospheric pressure and elevated temperatures, $β$ -SrGe $_{2}$ O $_{5}$ exhibits thermal stability up to 700 $^{\circ}$ C.

Crystal structure built from a GeO $_{6}$ -GeO $_{5}$ polyhedra network with high thermal stability: $β$ -SrGe $_{2}$ O $_{5}$

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Crystal structure built from a GeO $_{6}$ -GeO $_{5}$ polyhedra network with high thermal stability: $β$ -SrGe $_{2}$ O $_{5}$

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Crystal structure built from a GeO66​-GeO55​ polyhedra network with high thermal stability: ββ-SrGe22​O55​

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Crystal structure built from a GeO66​-GeO55​ polyhedra network with high thermal stability: ββ-SrGe22​O55​

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Crystal structure built from a GeO $_{6}$ -GeO $_{5}$ polyhedra network with high thermal stability: $β$ -SrGe $_{2}$ O $_{5}$

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Crystal structure built from a GeO $_{6}$ -GeO $_{5}$ polyhedra network with high thermal stability: $β$ -SrGe $_{2}$ O $_{5}$

讲解博客

AI智能校验