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Title: Ab-initio predictions of phase stability, electronic structure, and optical properties of (0001)-MAX surfaces in M2AC (M = Cr, Zr, Hf; A = Al, Ga)

Journal Article · · Journal of Physics and Chemistry of Solids
ORCiD logo [1];  [1];  [2];  [3]; ORCiD logo [4];  [5]
  1. Harbin Inst. of Technology (China). State Key Lab. of Advanced Welding and Joining; Harbin Inst. of Technology (China)
  2. AECC Harbin Bearing Co. Ltd., Harbin (China)
  3. Harbin Inst. of Technology (China)
  4. Nepal Academy of Science and Technology (NAST), Lalitpur (Nepal)
  5. Ames Lab., and Iowa State Univ., Ames, IA (United States)

In this work, we report MAX phases' surface properties, which are essential for thin-film technology due to their excellent resistance to high-temperature oxidation, corrosion, and wear. The surface stability, electronic, and optical properties of 0001-surfaces in M2AC (M = Zr, Hf, Cr; A = Al, Ga) are investigated and compared with their bulk counterparts. The interplay between chemical bonding and charge distribution is discussed from electronic structure, including the Fermi surfaces. Four possible (0001)-terminated surfaces are considered by breaking M - C and M-A bonds in which cleavage energy of M - C is higher than M-A. The Cr–Al bond in Cr2AlC is stronger than other M-A bonds. The charge density of valance A-p electrons redistributes in the surface area, distinct from that of the bulk. The A- and M(C)-terminated (0001)-surfaces are the most stable and energetically favorable terminations due to lower surface energies. The optical properties of the most stable (0001)-surfaces were also investigated to understand the dielectric and photoconductive behavior in the (0001)-terminated surfaces of M2AC.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1817622
Report Number(s):
IS--J 10,576
Journal Information:
Journal of Physics and Chemistry of Solids, Journal Name: Journal of Physics and Chemistry of Solids Vol. 160; ISSN 0022-3697
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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