Molecular origin of auxetic behavior in tetrahedral framework silicates

Alderson, Andrew and Evans, K. E. (2002) Molecular origin of auxetic behavior in tetrahedral framework silicates. Physical Reviews Letters, 89 (22). pp. 225301-225304. ISSN 1079-7114

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Abstract

Recent analytical models for the Poisson?s ratios (íij) of tetrahedral frameworks are applied to á-cristobalite and á-quartz for the first time. Rotation and dilation of the SiO4 tetrahedral subunits are considered. Each mechanism leads to negative í31 values, whereas negative and positive values are possible when they act concurrently. The concurrent model is in excellent agreement with experiment and explains the dichotomy between negative and positive í31 values in á-cristobalite and á-quartz, respectively. The predicted strain-dependent trends confirm those from molecular modeling.

Item Type: Article
Additional Information: Metadata only available from this repository. Article published in Physical Reviews Letters, The American Physical Society. APS can be found online here http://www.aps.org/
Divisions: University of Bolton Research Centres > Institute for Materials Research and Innovation
Depositing User: Scott Wilson
Date Deposited: 26 Nov 2013 12:52
Last Modified: 14 Jan 2014 11:55
Identification Number: 10.1103/PhysRevLett.89.225503
URI: http://ubir.bolton.ac.uk/id/eprint/53

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