Structural integrity and characteristics at lattice and nanometre levels of ZrN polycrystalline irradiated by 4 MeV Au ions
journal contributionposted on 09.07.2018 by Weichao Bao, Stuart Robertson, Ji-Xuan Liu, Guo-Jun Zhang, Fangfang Xu, Houzheng Wu
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We report an as-hot-pressed zirconium nitride polycrystalline with its primary crystal structure maintained no change but lattice defects and features were introduced at nanometre-scale after being irradiated by 4 MeV Au 2+ with a total fluence of 5 × 10 16 /cm 2 . The variation of grey-level seen in backscattered electron images and electron backscattered diffraction maps directly evidenced the structure integrity of the polycrystalline ZrN is well maintained with no crystal structure change of ZrN. The irradiation depth had no relevance to crystal orientation, and Au deposition peaked at a depth of ∼0.58 μm with a near-Gaussian distribution. Within a depth < 0.58 μm, long dislocation lines were developed with a Burgers vector of [01¯] b /2 and density 3.2 × 10 14 1/m 2 ; beyond this depth, dislocation loops were formed with much higher density. In the ionization zone, cubic ZrO 2 crystallites precipitated in a size of ∼5 nm. The irradiation damage processes are discussed based on the observed features.
The present work was financially supported by the National Natural Science Foundation of China (51532009, 51502322, 11575275), Science and Technology Commission of Shanghai Municipality (16DZ2260603), Shanghai Technical Platform for Testing and Characterization on Inorganic Materials (14DZ2292900), and Loughborough University’s PhD studentship provided to SR. The authors acknowledge use of facilities within the Loughborough Materials Characterisation Centre.
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