# Elasticity of α-Cristobalite: A Silicon Dioxide with a Negative Poisson's Ratio

@article{YeganehHaeri1992ElasticityO, title={Elasticity of $\alpha$-Cristobalite: A Silicon Dioxide with a Negative Poisson's Ratio}, author={Amir Yeganeh-Haeri and D J Weidner and John B. Parise}, journal={Science}, year={1992}, volume={257}, pages={650 - 652} }

Laser Brillouin spectroscopy was used to determine the adiabatic single-crystal elastic stiffness coefficients of silicon dioxide (SiO2) in the α-cristobalite structure. This SiO2 polymorph, unlike other silicas and silicates, exhibits a negative Poisson's ratio; α-cristobalite contracts laterally when compressed and expands laterally when stretched. Tensorial analysis of the elastic coefficients shows that Poisson's ratio reaches a maximum value of –0.5 in some directions, whereas averaged…

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