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

  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},
  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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From a thermodynamic point of view, conservation of volume is not required

    For details on Brillouin spectroscopy see, for

    • J. Geophys. Res
    • 1977

    This research was supported by the Planetary Atmospheres Program of the Solar System Exploration Division of the National Aeronautics and REFERENCES AND NOTES