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Title: Pressure-induced reversible phase transition on Mo2Ga2C

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.5034101· OSTI ID:1468807
 [1];  [2]; ORCiD logo [3];  [4];  [5]
  1. Peking Univ. and School of Earth and Space Sciences, Beijing (China); China Academy of Engineering Physics, Mianyang (China)
  2. China Academy of Engineering Physics, Mianyang (China)
  3. Wuhan Univ. of Technology (China)
  4. Southwest Jiaotong Univ., Chengdu (China)
  5. China Univ. of Geosciences, Wuhan (China)

The newly carbide α-Mo2Ga2C with P63/mmc space group presents a unique top-packed Ga double layer structure. Pressure-induced phase transition of Mo2Ga2C has been investigated by in-situ high-pressure synchrotron radiation X-ray diffraction, Raman spectroscopy combined with diamond anvil cell technique, and first-principle calculations. Both experimental and theoretical results show that a first-order phase transition from P63/mmc to P3¯m1 occurs at ~22 GPa, where the high-pressure phase named β-Mo2Ga2C has a close-packed Ga double layer zig-zag structure. The isothermal pressure-volume relationship of Mo2Ga2C is described by the second-order Birch-Murnaghan equation of state, yielding K0 = 139(2) GPa, K0' = 4(fixed), and V0 = 144.5(1) Å3 for α-Mo2Ga2C; K0 = 187(3) GPa, K0' = 4(fixed), and V0 = 137.9(2) Å3 for β-Mo2Ga2C. The instability caused by the repulsive force between the Ga atoms in the top-packed double-layer under pressure mainly accounts for the phase transition. In conclusion, the newly discovered β-Mo2Ga2C reveals that the MAX-like M2A2X type ternary compounds with different compositions may form various structures with different space groups.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Science and Technology Development Foundation of China Academy of Engineering Physics; National Science Foundation-Earth Sciences; Natural Sciences Foundation of China
Grant/Contract Number:
AC02-06CH11357; 91326102; 51532009; 51741208; 2013A0301012; EAR-1128799; FG02-94ER14466
OSTI ID:
1468807
Journal Information:
Journal of Applied Physics, Vol. 124, Issue 8; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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