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タイトル: | First-principles-based phase diagram of the cubic BNC ternary system |
著者: | Yuge, Koretaka Seko, Atsuto https://orcid.org/0000-0002-2473-3837 (unconfirmed) Koyama, Yukinori Oba, Fumiyasu Tanaka, Isao https://orcid.org/0000-0002-4616-118X (unconfirmed) |
発行日: | Mar-2008 |
出版者: | American Physical Society |
誌名: | PHYSICAL REVIEW B |
巻: | 77 |
号: | 9 |
論文番号: | 094121 |
抄録: | The phase diagram for the cubic BNC ternary system in a heterodiamond structure was examined by Monte Carlo simulations and the cluster expansion technique based on first-principles calculations. All the atomic arrangements exhibit positive formation energies, indicating phase separation into cubic BN (c-BN) and diamond. These arrangements show a strong preference for B-N and C-C bonds and disfavor B-C, C-N, B-B, and N-N bonds along the first nearest neighbor coordination. This can be naturally attributed to the oversaturation and undersaturation of the number of electrons for respective first nearest neighbor bonds. First-principles-based lattice-dynamics calculations reveal that the formation of a solid solution between c-BN and diamond decreases vibrational free energy, resulting in a significant enhancement of the solubility for both c-BN and diamond-rich phases. Complete miscibility is achieved over T=4500 K, which is higher than the melting points of both diamond and c-BN. |
著作権等: | © 2008 The American Physical Society |
URI: | http://hdl.handle.net/2433/84627 |
DOI(出版社版): | 10.1103/PhysRevB.77.094121 |
関連リンク: | http://link.aps.org/doi/10.1103/PhysRevB.77.094121 |
出現コレクション: | 学術雑誌掲載論文等 |
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