Poisson's Ratio and Auxetic Properties of Natural Rocks.

Ji, Shaocheng, Li, Le, Motra, Hem Bahadur, Wuttke, Frank, Sun, Shengsi, Michibayashi, Katsuyoshi and Salisbury, Matthew H. (2018) Poisson's Ratio and Auxetic Properties of Natural Rocks. Journal of Geophysical Research: Solid Earth, 123 . DOI 10.1002/2017JB014606.

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Here we provide an appraisal of the Poisson's ratios (υ) for natural elements, common oxides, silicate minerals, and rocks with the purpose of searching for naturally auxetic materials. The Poisson's ratios of equivalently isotropic polycrystalline aggregates were calculated from dynamically measured elastic properties. Alpha-cristobalite is currently the only known naturally occurring mineral that has exclusively negative υ values at 20-1500 °C. Quartz and potentially berlinite (AlPO4) display auxetic behavior in the vicinity of their α-β structure transition. None of the crystalline igneous and metamorphic rocks (e.g., amphibolite, gabbro, granite, peridotite, and schist) display auxetic behavior at pressures of ˃5 MPa and room temperature. Our experimental measurements showed that quartz-rich sedimentary rocks (i.e., sandstone and siltstone) are most likely to be the only rocks with negative Poisson's ratios at low confining pressures (≤200 MPa) because their main constituent mineral, α-quartz, already has extremely low Poisson's ratio (υ=0.08) and they contain microcracks, micropores and secondary minerals. This finding may provide a new explanation for formation of dome-and-basin structures in quartz-rich sedimentary rocks in response to a horizontal compressional stress in the upper crust.

Document Type: Article
Keywords: Poisson's ratio, auxetic properties, Minerals, rocks
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2017JB014606
ISSN: 2169-9313
Projects: Future Ocean
Date Deposited: 01 Feb 2018 13:06
Last Modified: 02 Apr 2019 09:10
URI: http://oceanrep.geomar.de/id/eprint/41797

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