Extended Mapping and Exploration of the Vanadium Dioxide Stress-Temperature Phase Diagram

Abstract

Single-crystal micro-and nanomaterials often exhibit higher yield strength than their bulk counterparts. This enhancement is widely recognized in structural materials but is rarely exploited to probe fundamental physics of electronic materials. Vanadium dioxide exhibits coupled electronic and structural phase transitions that involve different structures existing at different strain states. Full understanding of the driving mechanism of these coupled transitions necessitates concurrent structural and electrical measurements over a wide phase space. Taking advantages of the superior mechanical property of micro/nanocrystals of VO2, we map and explore its stress-temperature phase diagram over a phase space that is more than an order of magnitude broader than previously attained. New structural and electronic aspects were observed crossing phase boundaries at high-strain states. Our work shows that the actively tuning strain in micro/nanoscale electronic materials provides an effective route to investigate their fundamental properties beyond what can be accessed in their bulk counterpart.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Correlated electron nanomaterials; Mechanical strength; Phase transition; Strain; Vanacium dioxide

International Standard Serial Number (ISSN)

1530-6984; 1530-6992

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2010 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Jul 2010

Link to Full Text

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