Negative linear compressibility in common materials

Miller, W.; Evans, K. E.; Marmier, A.

Abstract

© 2015 AIP Publishing LLC. Negative linear compressibility (NLC) is still considered an exotic property, only observed in a few obscure crystals. The vast majority of materials compress axially in all directions when loaded in hydrostatic compression. However, a few materials have been observed which expand in one or two directions under hydrostatic compression. At present, the list of materials demonstrating this unusual behaviour is confined to a small number of relatively rare crystal phases, biological materials, and designed structures, and the lack of widespread availability hinders promising technological applications. Using improved representations of elastic properties, this study revisits existing databases of elastic constants and identifies several crystals missed by previous reviews. More importantly, several common materials - drawn polymers, certain types of paper and wood, and carbon fibre laminates - are found to display NLC. We show that NLC in these materials originates from the misalignment of polymers/fibres. Using a beam model, we propose that maximum NLC is obtained for misalignment of 26°. The existence of such widely available materials increases significantly the prospects for applications of NLC.

• Journal Article Type: Article
• Acceptance Date: Jun 2, 2015
• Online Publication Date: Jun 10, 2015
• Publication Date: Jun 8, 2015
• Deposit Date: Jun 16, 2016
• Publicly Available Date: Jun 16, 2016
• Journal: Applied Physics Letters
• Print ISSN: 0003-6951
• Electronic ISSN: 1077-3118
• Publisher: AIP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 106
• Issue: 23
• Article Number: 231903
• DOI: https://doi.org/10.1063/1.4922460
• Keywords: negative linear compressibility, common materials
• Public URL: https://uwe-repository.worktribe.com/output/843492
• Publisher URL: http://dx.doi.org/10.1063/1.4922460
• Contract Date: Jun 16, 2016