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Preparation of gallium oxynitride in the presence of iron through a citrate route |
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| Authors: | Shinichi Yamamoto Yuji Masubuchi Maki Okube Marck Lumey |
| Affiliation: | a Graduate School of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan b Materials and Structures Laboratory, Tokyo Institute of Technology, 4259, Nagatsuta, Yokohama, Kanagawa 226-8503, Japan c Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan d Institute of Inorganic Chemistry, RWTH Aachen University, D-52056 Aachen, Germany |
| Abstract: | Gallium oxynitrides were prepared in the copresence of various amounts of Fe3+ by ammonia nitridation of oxide precursors. Their crystallinity reduced in a compositional range up to 3 mol% and improved again above 4 mol% with an appearance of a nitride impurity. The product with 2 mol% of Fe3+ showed the maximum oxygen content of 21 mol% and minimum nitrogen content of 24 mol%. X-ray absorption spectroscopy, Mössbauer and magnetic measurements suggested a small amount of Fe3O4-like clusters in the oxynitride products. Density-functional calculations supported that the Fe-O-clustered system is more preferable than the statistical distribution of iron in the hexagonal gallium oxynitride structure. |
| Keywords: | A Inorganic compounds A Nitrides B Chemical synthesis D Crystal structure D Electronic structure |
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