Crystal structure of Cr4AlB4: A new MAB phase compound discovered in Cr-Al-B system
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第4期
论文作者：Haiming Zhang Fu-zhi Dai Huimin Xiang Zhili Zhang Yanchun Zhou
文章页码：530 - 534
摘 要：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?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） ?, b = 18.8911（0） ?, c = 2.9733（7） ?, and the atomic positions are Cr1 at 4 g（0, 0.2936（5）,0）, Cr2 at 4 h（0.5, 0.5859（7）, 0）, Al at 2 b（0, 0.5, 0.5）, B1 at 4 h（0, 0.3839（8）, 0.5） and B2 at 4 g（0.5, 0.6646（2）,0.5）.
Haiming Zhang1,2，Fu-zhi Dai1，Huimin Xiang1，Zhili Zhang2，Yanchun Zhou1
1. Science and Technology on Advanced Functional Composite Laboratory,Aerospace Research Institute of Materials & Processing Technology2. School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University
摘 要：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?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） ?, b = 18.8911（0） ?, c = 2.9733（7） ?, and the atomic positions are Cr1 at 4 g（0, 0.2936（5）,0）, Cr2 at 4 h（0.5, 0.5859（7）, 0）, Al at 2 b（0, 0.5, 0.5）, B1 at 4 h（0, 0.3839（8）, 0.5） and B2 at 4 g（0.5, 0.6646（2）,0.5）.
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