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Exploring the elastic and electronic properties of chromium molybdenum diboride alloys

Journal Article · · Journal of Alloys and Compounds
 [1];  [2];  [3];  [4];  [5]
  1. West Virginia Univ., Morgantown, WV (United States); West Virginia Univ., Morgantown, WV (United States)
  2. West Virginia Univ., Morgantown, WV (United States)
  3. Univ. of Liege (Belgium); Catalan Institute of Nanoscience and Nanotechnology (ICN2), Barcelona (Spain)
  4. Benemerita Universidad Autónoma de Puebla (BUAP) (Mexico)
  5. West Virginia Univ., Morgantown, WV (United States); Benemerita Universidad Autónoma de Puebla (BUAP) (Mexico)
We perform first-principles calculations to study the structural, mechanical, thermal, electronic, and magnetic properties of Cr1-xMoxB2 for x = 0.25, 0.33, 0.50, 0.67 and 0.75. Based on structural search methods, we determine the ground-state structure for each concentration. The ternaries are either monoclinic (x = 0.25, 0.75) or trigonal (x = 0.33, 0.50, 0.67). The calculated mechanical properties reveal that the strength of Cr1-xMoxB2 is maximized for x = 0.50. Cr0.5Mo0.5B2 exhibits excellent mechanical properties (B = 298 GPa, Y = 558 GPa, G = 235 Gpa, ν = 0.19, Hv =27 GPa), surpassing those of β-MoB2 at a lower cost. All of these ternaries are hard alloys with Vickers hardness greater than 24 GPa. Chemical bonding analysis demonstrates that the strength of the new compounds is related to the alternating planar and buckled B-B layers, as well as the strong TM-B bonds. Finally, the enhanced strength of Cr0.5Mo0.5B2 is a consequence of the high density of strong interlayer Cr-Mo metallic bonds around the Fermi level.
Research Organization:
West Virginia Univ., Morgantown, WV (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC)
Grant/Contract Number:
SC0021375
OSTI ID:
1853777
Journal Information:
Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Journal Issue: C Vol. 866; ISSN 0925-8388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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