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Phys Chem Chem Phys. 2015 Jul 21;17(27):17927-33. doi: 10.1039/c5cp01168j. Epub 2015 Jun 22.

A systematic typology for negative Poisson's ratio materials and the prediction of complete auxeticity in pure silica zeolite JST.

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College of Engineering, Mathematics and Physical Science, University of Exeter, EX4 4QF, UK.


Single crystals can commonly have negative Poisson's ratio in a few directions; however more generalised auxeticity is rarer. We propose a typology to distinguish auxetic materials. We characterise numerous single crystals and demonstrate that partial auxeticity occurs for around 37%. We find average auxeticity to be limited to α-cristobalite and no example of complete auxeticity. We simulate two hundreds pure silica zeolites with empirical potentials and quantum chemistry methods, and for the first time identify complete auxeticity in a zeolite network, JST.


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