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Combustion synthesis of AlN doped with carbon and oxygen
Author(s) -
Saito Genki,
Kunisada Yuji,
Watanabe Takumi,
Yi Xuemei,
Nomura Takahiro,
Sakaguchi Norihito,
Akiyama Tomohiro
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15947
Subject(s) - materials science , carbon fibers , oxygen , doping , analytical chemistry (journal) , graphite , absorption (acoustics) , calcination , inorganic chemistry , chemistry , catalysis , organic chemistry , composite material , optoelectronics , composite number
Carbon‐and‐oxygen‐doped AlN specimens were prepared by combustion synthesis using Al, graphite, and AlN. Graphite addition changed the product color from white to blue. By XRD , the lattice constant increased slightly with increasing carbon content. Blue AlN powder was synthesized with a molar ratio of the diluent AlN of 0.2‐0.5 with a fixed graphite content of 0.05. At an AlN molar ratio exceeding 0.6, carbon was not successfully incorporated due to the lower reaction temperature. Calcination at 800°C in air removed residual graphite without changing the crystal structure or product color. Oxygen, nitrogen, and carbon analyses revealed that blue AlN powders contained 0.45‐0.54 mass% carbon and 1.4‐1.6 mass% oxygen, while the undoped AlN contained 0.021 mass% carbon and 0.94 mass% oxygen. The origin of the white‐to‐blue color change was investigated via reflection measurements. Blue AlN exhibits an absorption peak at 634 nm (1.96 eV). From first‐principles electronic structure calculations, the C‐doped AlN and carbon‐and‐oxygen‐doped AlN with a 1:1 ratio could be classified as p‐type, whereas the O‐doped AlN and 1:3 carbon‐and‐oxygen‐doped AlN were n‐type. One reason for the absorption peak at 634 nm may be a transition from the conduction band to an upper unoccupied state. These results suggest the possible control of optical and electronic properties of AlN via carbon‐and‐oxygen doping.