Mechanism of strain relaxation: key to control of structural and electronic transitions in VO2 thin-films
Year: 2019
Type: article
Abstract: VO2 is a smart transition-metal oxide, which exhibits a tetragonal-to-monoclinic phase transition at ∼ 68°C. We report a case where both tetragonal and monoclinic phases exist in relaxed and strained domains, respectively, above the transition temperature. The epitaxial nucleation of these relaxed domains of VO2 over the strained one occurs when the critical thickness criterion is met through the emergence of interfacial dislocations under domain-matching epitaxy paradigm. Below this critical thickness, the film isostructurally (across the transition temperature range) adopts a strained-monoclinic phase. Above the critical thickness, domains are structurally free to transform from tetragonal to monoclinic.
Source: Materials Research Letters
Authors: Adele Moatti, Ritesh Sachan, Jagdish Narayan
Institutions: North Carolina State University, Oklahoma State University
Language: English
Subfield: Polymers and Plastics
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,459
OpenAlex ID: W2981868196