Disorder in M_n+1AX_n phases at the atomic scale.

ABSTRACT: 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 M_n+1AX_n phases using double C_S-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 M_n+1X_n. With the formation of uniformly distributed cation antisite defects and the rearrangement of X a

SUBMITTER: Wang C 

PROVIDER: S-EPMC6367347 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature