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Disorder in Mn+1AXn phases at the atomic scale

Journal Article · · Nature Communications
 [1];  [2];  [3];  [4];  [5];  [4];  [4];  [4];  [6];  [7];  [8];  [8];  [2];  [3];  [2]
  1. Stanford Univ., CA (United States); Peking Univ., Beijing (China)
  2. Peking Univ., Beijing (China)
  3. Stanford Univ., CA (United States)
  4. Univ. of Michigan, Ann Arbor, MI (United States)
  5. Monash Univ., Clayton, VIC (Australia)
  6. Chinese Academy of Sciences (CAS), Beijing (China)
  7. Chinese Academy of Sciences (CAS), Ningbo (China)
  8. Chinese Academy of Sciences (CAS), Shenyang (China)
Atomic disordering in materials alters their physical and chemical properties and can subsequently affect their performance. In complex ceramic materials, it is a challenge to understand the nature of structural disordering, due to the difficulty of direct, atomic-scale experimental observations. Here we report the direct imaging of ion irradiation-induced antisite defects in Mn+1AXn phases using double CS-corrected scanning transmission electron microscopy and provide compelling evidence of order-to-disorder phase transformations, overturning the conventional view that irradiation causes phase decomposition to binary fcc-structured Mn+1AXn. With the formation of uniformly distributed cation antisite defects and the rearrangement of X anions, disordered solid solution γ-(Mn+1A)Xn phases are formed at low ion fluences, followed by gradual transitions to solid solution fcc-structured (Mn+1A)Xn phases. This study provides a comprehensive understanding of the order-to-disorder transformations in Mn+1AXn phases and proposes a method for the synthesis of new solid solution (Mn+1A)Xn phases by tailoring the disorder.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States); Univ. of Notre Dame, IN (United States)
Sponsoring Organization:
National Magnetic Confinement Fusion Energy Research Project of China; National Natural Science Foundation of China; National Science Foundation (NSF); USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-05CH11231; SC0001089
OSTI ID:
1543754
Alternate ID(s):
OSTI ID: 1567160
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 10; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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