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

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Siddorn, M. ; Coudert, F.-X. ; Evans, K. E. ; Marmier, A. (2015)

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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