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Room-temperature oxygen vacancy migration induced reversible phase transformation during the anelastic deformation in CuO
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Room-temperature oxygen vacancy migration induced reversible phase transformation during the anelastic deformation in CuO
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Room-temperature oxygen vacancy migration induced reversible phase transformation during the anelastic deformation in CuO
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Journal Article
Room-temperature oxygen vacancy migration induced reversible phase transformation during the anelastic deformation in CuO
2021
Overview
From the mechanical perspectives, the influence of point defects is generally considered at high temperature, especially when the creep deformation dominates. Here, we show the stress-induced reversible oxygen vacancy migration in CuO nanowires at room temperature, causing the unanticipated anelastic deformation. The anelastic strain is associated with the nucleation of oxygen-deficient CuO
x
phase, which gradually transforms back to CuO after stress releasing, leading to the gradual recovery of the nanowire shape. Detailed analysis reveals an oxygen deficient metastable CuO
x
phase that has been overlooked in the literatures. Both theoretical and experimental investigations faithfully predict the oxygen vacancy diffusion pathways in CuO. Our finding facilitates a better understanding of the complicated mechanical behaviors in materials, which could also be relevant across multiple scientific disciplines, such as high-temperature superconductivity and solid-state chemistry in Cu-O compounds, etc.
The effect of point defects on mechanical behaviour of materials is generally considered at high temperatures. This work reports a reversible stress-induced migration of point defects during anelastic deformation in CuO nanowires at room temperature resulting from heterogeneous strain distribution.
