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Synthesis, stoichiometry and thermal stability of Zn3N2 powders prepared by ammonolysis reactions |
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| Authors: | Giordano Paniconi Ronald I Smith Bryan L Gallagher |
| Institution: | a School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK b ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, UK c Measurements and Characterization Division, National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, CO 80401, USA d School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK e Department of Chemistry, WestCHEM, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, UK |
| Abstract: | Zn3N2 powders were prepared by ammonolysis reactions at 600 °C and examined by thermogravimetric analysis, powder X-ray and neutron diffraction. The powders obtained in this way are unstable in an oxygen atmosphere above 450 °C. In an argon atmosphere, the powders are stable up to their decomposition point at around 700 °C. Structural models obtained from Rietveld refinements against the powder neutron diffraction data indicate that the Zn3N2 powders so-prepared have the anti-bixbyite structure and are almost certainly stoichiometric with no compelling evidence of nitrogen vacancies. Further, no evidence was found for aliovalent oxygen substitution at the nitrogen sites. The calculated bond valence sums imply that Zn3N2 cannot be described as a 100% ionic compound. The structural findings are supported by photoluminescence measurements that reveal a band gap of approximately 0.9 eV. |
| Keywords: | Zinc nitride Powder neutron diffraction Stoichiometry Nitrogen vacancies Ammonolysis |
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