期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 35, 期 4, 页码 530-534出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2018.10.006
关键词
Cr4AlB4; MAB phases; Crystal structure; Layered ternary borides; Ultrahigh temperature ceramics
资金
- National Natural Science Foundation of China [51672064, U1435206]
In this communication, the crystal structure of Cr4AlB4, a new MAB phase compound (where M is a transition metal,A is Al or Si, B is boron) discovered in Cr-Al-B system is reported. This new MAB phase was synthesized from a mixture of CrB and Al powders at 1000 degrees C and its crystal structure was determined by a combination of X-ray diffraction, first-principles calculations and energy dispersive X-ray spectroscopy (EDS). Cr4AlB4 crystallizes in an orthorhombic structure with Immm space group. The lattice constants are a = 2.9343(6) A, b = 18.8911(0)A, c = 2.9733(7)A, and the atomic positions are Cr1 at 4g (0, 0.2936(5), 0), Cr2 at 4h (0.5, 0.5859(7), 0), Al at 2b (0, 0.5, 0.5), B1 at 4h (0, 0.3839(8), 0.5) and B2 at 4g (0.5, 0.6646(2), 0.5). (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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