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Science 6 March 1998:
Vol. 279. no. 5356, pp. 1522 - 1524
DOI: 10.1126/science.279.5356.1522
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Reports

Materials with Negative Compressibilities in One or More Dimensions

Ray H. Baughman, * Sven Stafström, Changxing Cui, Socrates O. Dantas

Rare crystal phases that expand in one or more dimensions when hydrostatically compressed are identified and shown to have negative Poisson's ratios. Some of these crystals (i) decrease volume and expand in two dimensions when stretched in a particular direction and (ii) increase surface area when hydrostatically compressed. Possible mechanisms for achieving such negative linear and area compressibilities are described for single crystals and composites, and sensor applications are proposed. Materials with these properties may be used to fabricate porous solids that either expand in all directions when hydrostatically compressed with a penetrating fluid or behave as if they are incompressible.

R. H. Baughman and C. Cui, Allied Signal, Research and Technology, Morristown, NJ 07962-1021, USA.
S. Stafström, Department of Physics and Measurement Technology, Linköping University, S-581 83, Linköping, Sweden.
S. O. Dantas, Departamento de Fisica, UFJF, CEP 36036-330, Juiz de Fora, Minas Gerais, Brazil.
*   To whom correspondence should be addressed. E-mail: ray.baughman{at}alliedsignal.com

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