Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1491713 | Materials Research Bulletin | 2009 | 4 Pages |
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 3Â mol% and improved again above 4Â mol% with an appearance of a nitride impurity. The product with 2Â mol% of Fe3+ showed the maximum oxygen content of 21Â mol% and minimum nitrogen content of 24Â 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
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Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Shinichi Yamamoto, Shinichi Kikkawa, Yuji Masubuchi, Takashi Takeda, Maki Okube, Akira Yoshiasa, Marck Lumey, Richard Dronskowski,