ELASTICITY OF ALPHA-CRISTOBALITE - A SILICON DIOXIDE WITH A NEGATIVE POISSONS RATIO

被引：403

作者：

YEGANEHHAERI, A ^{[1
]}

WEIDNER, DJ ^{[1
]}

PARISE, JB ^{[1
]}

机构：

[1] SUNY STONY BROOK,DEPT EARTH & SPACE SCI,STONY BROOK,NY 11794

来源：

SCIENCE | 1992年 / 257卷 / 5070期

关键词：

D O I：

10.1126/science.257.5070.650

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Laser Brillouin spectroscopy was used to determine the adiabatic single-crystal elastic stiffness coefficients of silicon dioxide (SiO2) in the alpha-cristobalite structure. This SiO2 polymorph, unlike other silicas and silicates, exhibits a negative Poisson's ratio; alpha-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 values for the single-phased aggregate yield a Poisson's ratio of -0.16.

引用

页码：650 / 652

页数：3

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