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By tackling the challenge of extending transparent oxide semiconductors to Gebased oxides, we have found a not-yet-reported crystal structure, named$\beta$-SrGe$_2$O$_5$, which is composed of edge-sharing GeO$_6$ octahedrainterconnected by GeO$_5$ bipyramids. Single crystals were successfully grownby the high-pressure flux method. $\beta$-SrGe$_2$O$_5$ has a band gap of 5.2eV and a dispersive conduction band with an effective mass as small as 0.34times 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 elevatedtemperatures, $\beta$-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: $\beta$-SrGe$_2$O$_5$