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Title: An alternative explanation for the negative Poisson's ratios in α-cristobalite
Authors: Grima, Joseph N.
Gatt, Ruben
Alderson, Andrew
Evans, Kenneth E.
Keywords: Cristobalite
Materials -- Mechanical properties
Deformations (Mechanics)
Issue Date: 2006
Publisher: Elsevier
Citation: Grima, J. N., Gatt, R., Alderson, A., & Evans, K. E. (2006). An alternative explanation for the negative Poisson's ratios in α-cristobalite. Materials Science and Engineering A, 423, 219-224.
Abstract: Materials with a negative Poisson’s ratio (auxetic) exhibit the unusual property of becoming wider when stretched and thinner when compressed. A naturally occurring auxetic material which has attracted a lot of research in recent years is -cristobalite, a silicate for which negative Poisson’s ratios have been experimentally measured. We present the results of force-field based molecular modelling studies which will provide an insight into nano-level deformations that occur when this silicate is subjected to externally applied uniaxial mechanical stresses. These results will suggest that the auxetic behaviour can be explained in terms of a ‘rotation of rigid units’ model and, more specifically we will show that the auxetic behaviour in the (0 1 0) and (1 0 0) planes may be explained in terms of ‘rotating rectangles’ which are the projections of the three-dimensional silicate framework in the (0 1 0) and (1 0 0) planes.
Appears in Collections:Scholarly Works - FacSciChe
Scholarly Works - FacSciMet

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