Pressure-Induced YbFe2O4-Type to Spinel Structural Change of InGaMgO4
Authors:
- Takehiro KoikeTKTakehiro Koike
- Hena DasHDHena Das
- Kengo OkaKOKengo Oka
- Yoshihiro KusanoYKYoshihiro Kusano
- Fernando CubillasFCFernando Cubillas
- Francisco Brown BojorqezFBFrancisco Brown Bojorqez
- Victor Emmanuel Alvarez-MontanoVAVictor Emmanuel Alvarez-Montano
- Shigekazu ItoSIShigekazu Ito
- Kei ShigematsuKSKei Shigematsu
- Hayato ToganoHTHayato Togano
- Ikuya YamadaIYIkuya Yamada
- Hiroki IshibashiHIHiroki Ishibashi
Open Access
Abstract
Spinel-type InGaMgO4 with a = 8.56615(3) Å was prepared by treating layered YbFe2O4-type InGaMgO4 at 6 GPa and 1473 K. DFT calculation and Rietveld analysis of synchrotron X-ray powder diffraction data revealed the inverse spinel structure with In3+:Ga3+/Mg2+ = 0.726:0.274 in the tetrahedral site and 0.137:0.863 in the octahedral site. InGaMgO4 spinel is an insulator with an experimental band gap of 2.80 eV, and the attempt at hole doping by post-annealing in a reducing atmosphere to introduce an oxygen defect was unsuccessful. This is the first report of the bulk synthesis of AB2O4 compounds with both YbFe2O4 and spinel polymorphs.Keywords
Funding Information
- JSPS KAKENHI (JP19H05625, JP24H00374)
- Design and Engineering by Joint Inverse Innovation for Materials Architecture, MEXT (JP19H05625, JP24H00374)
- Collaborative Research Project of Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology (JP19H05625, JP24H00374)
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