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

Christian A. Niedermeier; Jun-ichi Yamaura; Jiazhen Wu; Xinyi He; Takayoshi Katase; Hideo Hosono; Toshio Kamiya

doi:10.1021/acsaelm.9b00552

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

Materials Science 2020-11-19 v1

Authors: Christian A. Niedermeier , Jun-ichi Yamaura , Jiazhen Wu , Xinyi He , Takayoshi Katase , Hideo Hosono , Toshio Kamiya

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Abstract

By tackling the challenge of extending transparent oxide semiconductors to Ge based oxides, we have found a not-yet-reported crystal structure, named $\beta$ -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. $\beta$ -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, $\beta$ -SrGe $_2$ O $_5$ exhibits thermal stability up to 700 $^\circ$ C.

Keywords

crystal structure germanium oxide thermal stability transparent oxide semiconductor high-pressure flux method band gap edge-sharing octahedra

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@article{arxiv.2011.09443,
  title  = {Crystal structure built from a GeO$_6$-GeO$_5$ polyhedra network with high thermal stability: $\beta$-SrGe$_2$O$_5$},
  author = {Christian A. Niedermeier and Jun-ichi Yamaura and Jiazhen Wu and Xinyi He and Takayoshi Katase and Hideo Hosono and Toshio Kamiya},
  journal= {arXiv preprint arXiv:2011.09443},
  year   = {2020}
}

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23 pages, 8 figures

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

Abstract

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