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E-beam-enhanced solid-state mechanical amorphization of alpha-quartz: Reducing deformation barrier via localized excess electrons as mobile anions

Sung-Gyu KangWonseok JeongHwangsun Kim ...+3 In-Suk Choi
Dec 2022
摘要
Under hydrostatic pressure, alpha-quartz undergoes solid-state mechanicalamorphization wherein the interpenetration of SiO4 tetrahedra occurs and thematerial loses crystallinity. This phase transformation requires a highhydrostatic pressure of 14 GPa because the repulsive forces resulting from theionic nature of the Si-O bonds prevent the severe distortion of the atomicconfiguration. Herein, we experimentally and computationally demonstrate thate-beam irradiation changes the nature of the interatomic bonds in alpha-quartzand enhances the solid-state mechanical amorphization at nanoscale.Specifically, during in situ uniaxial compression, a larger permanentdeformation occurs in alpha-quartz micropillars compressed during e-beamirradiation than in those without e-beam irradiation. Microstructural analysisreveals that the large permanent deformation under e-beam irradiationoriginates from the enhanced mechanical amorphization of alpha-quartz and thesubsequent viscoplastic deformation of the amorphized region. Further,atomic-scale simulations suggest that the delocalized excess electronsintroduced by e-beam irradiation move to highly distorted atomic configurationsand alleviate the repulsive force, thus reducing the barrier to the solid-statemechanical amorphization. These findings deepen our understanding ofelectron-matter interactions and can be extended to new glass forming andprocessing technologies at nano- and microscale.
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