Synthesis of MAX phases Nb2CuC and Ti2(Al0.1Cu0.9)N by A-site replacement reaction in molten salts
| Autor: | Haoming Ding, Youbing Li, Jun Lu, Kan Luo, Ke Chen, Mian Li, Per O. Å. Persson, Lars Hultman, Per Eklund, Shiyu Du, Zhengren Huang, Zhifang Chai, Hongjie Wang, Ping Huang, Qing Huang |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Materials Research Letters, Vol 7, Iss 12, Pp 510-516 (2019) |
| Druh dokumentu: | article |
| ISSN: | 2166-3831 21663831 |
| DOI: | 10.1080/21663831.2019.1672822 |
| Popis: | New MAX phases Ti2(AlxCu1−x)N and Nb2CuC were synthesized by A-site replacement by reacting Ti2AlN and Nb2AlC, respectively, with CuCl2 or CuI molten salt. X-ray diffraction, scanning electron microscopy, and atomically resolved scanning transmission electron microscopy showed complete A-site replacement in Nb2AlC, which lead to the formation of Nb2CuC. However, the replacement of Al in Ti2AlN phase was only close to complete at Ti2(Al0.1Cu0.9)N. Density-functional theory calculations corroborated the structural stability of Nb2CuC and Ti2CuN phases. Moreover, the calculated cleavage energy in these Cu-containing MAX phases are weaker than in their Al-containing counterparts. |
| Databáze: | Directory of Open Access Journals |
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