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High-Pressure Synthesis, Electron Energy-Loss Spectroscopy Investigations, and Single Crystal Structure Determination of a Spinel-Type Gallium Oxonitride Ga2.79◻0.21(O3.05N0.76◻0.19)

Huppertz, Hubert ; Hering, Stefanie A. ; Zvoriste, Carmen E. ; Lauterbach, Stefan ; Oeckler, Oliver ; Riedel, Ralf ; Kinski, Isabel (2009)
High-Pressure Synthesis, Electron Energy-Loss Spectroscopy Investigations, and Single Crystal Structure Determination of a Spinel-Type Gallium Oxonitride Ga2.79◻0.21(O3.05N0.76◻0.19).
In: Chemistry of Materials, 21 (10)
doi: 10.1021/cm803371k
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Under high-pressure/high-temperature conditions of 5 GPa and 1250 °C, the cubic phase Ga2.790.21(O3.05N0.760.19) ( = vacancy) was synthesized in a Walker-type multianvil apparatus. For the first time, the crystal structure of a gallium oxonitride was determined on the basis of single crystal X-ray diffraction data. The cubic spinel-type gallium oxonitride crystallizes in the space group Fd3̅m (No. 227) with a lattice parameter a0 = 827.8(2) pm. The combination of energy-dispersive X-ray spectroscopy (EDS) with electron energy-loss spectroscopy (EELS) allowed the quantification of nitrogen and oxygen for structural refinement. In the literature dealing with oxonitrides, crystal defects in spinel-type materials are handled with different models, mainly the approximation of a constant anion model. The present results indicate that this model is questionable, and one should also take into account a model with both cation and anion vacancies. Furthermore, a linear relationship between the lattice parameters and the ratio N/O in the gallium oxonitrides is questionable.

Typ des Eintrags: Artikel
Erschienen: 2009
Autor(en): Huppertz, Hubert ; Hering, Stefanie A. ; Zvoriste, Carmen E. ; Lauterbach, Stefan ; Oeckler, Oliver ; Riedel, Ralf ; Kinski, Isabel
Art des Eintrags: Bibliographie
Titel: High-Pressure Synthesis, Electron Energy-Loss Spectroscopy Investigations, and Single Crystal Structure Determination of a Spinel-Type Gallium Oxonitride Ga2.79◻0.21(O3.05N0.76◻0.19)
Sprache: Englisch
Publikationsjahr: 2009
Verlag: ACS
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Chemistry of Materials
Jahrgang/Volume einer Zeitschrift: 21
(Heft-)Nummer: 10
DOI: 10.1021/cm803371k
Kurzbeschreibung (Abstract):

Under high-pressure/high-temperature conditions of 5 GPa and 1250 °C, the cubic phase Ga2.790.21(O3.05N0.760.19) ( = vacancy) was synthesized in a Walker-type multianvil apparatus. For the first time, the crystal structure of a gallium oxonitride was determined on the basis of single crystal X-ray diffraction data. The cubic spinel-type gallium oxonitride crystallizes in the space group Fd3̅m (No. 227) with a lattice parameter a0 = 827.8(2) pm. The combination of energy-dispersive X-ray spectroscopy (EDS) with electron energy-loss spectroscopy (EELS) allowed the quantification of nitrogen and oxygen for structural refinement. In the literature dealing with oxonitrides, crystal defects in spinel-type materials are handled with different models, mainly the approximation of a constant anion model. The present results indicate that this model is questionable, and one should also take into account a model with both cation and anion vacancies. Furthermore, a linear relationship between the lattice parameters and the ratio N/O in the gallium oxonitrides is questionable.

Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 12 Apr 2012 09:20
Letzte Änderung: 05 Mär 2013 10:00
PPN:
Sponsoren: This work was financially supported by the Deutsche Forschungsgemeinschaft HU 966/5-1 and KI 838/3-1., H. Huppertz and R. Riedel are indebted to the Fonds der Chemischen Industrie for financial support.
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