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Abstract

Screw dislocations play a significant role in the growth of crystalline structures by providing a continuous source of surface steps, which represent available sites for crystal growth. Here we show that pure screw dislocations can become helical by the absorption of defects (e.g., vacancies), and develop attractive interaction with another helical dislocation to form a double helix of screw dislocations. These single and double helix of screw dislocations can result in the formation of interesting nanostructures with large Eshelby twists. Examples of the formation of a double helix during thermal annealing of screw dislocations in magnesium oxide are presented. These large effective Burgers also unravel the mechanism for the formation of nanopipes and micropipes with hollow cores and nanotubes with Eshelby twists in technologically important materials, such as SiC, GaN and ZnO that are utilized in a variety of advanced solid state devices.

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First Claim