Abstract
The structure of the wurtzite-derived β-AgGaO2 was refined by Rietveld analysis of high-resolution powder diffraction data obtained using synchrotron X-ray radiation. The space group of the crystal is Pna21 with lattice parameters of a0=5.56175 A˚, b0=7.14749 A˚, and c0=5.46875 A˚. The deviation of O-Ag-O and M-O-M bond angles from the regular tetrahedral angle of 109.51 was very large at ∼8° and ∼11°, respectively. The electronic structure of β-AgGaO2 is discussed based on its structure, and the indirect band gap of β-AgGaO2 was related to significant tetrahedral distortion. Although β-AgGaO2 decomposes into metallic silver and Ga2O3 at a high temperature in any atmosphere, β-AgGaO2 is stable up to 690°C under an O2 atmosphere. No direct transformation from the wurtzite-derived phase to a delafossite phase occurs in β-AgGaO2.
Original language | English |
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Pages (from-to) | 66-70 |
Number of pages | 5 |
Journal | Journal of Solid State Chemistry |
Volume | 222 |
DOIs | |
Publication status | Published - 2015 Feb |
Externally published | Yes |
Keywords
- AgGaO
- Crystal structure
- I-III-VI semiconductors
- Wurtzite structure
- X-ray diffraction
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry