Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan.
Nat Commun. 2011 Jun 14;2:345. doi: 10.1038/ncomms1343.
SiO(2) glass has a network structure with a significant amount of interstitial voids. Gas solubilities in silicates are expected to become small under high pressure due to compaction of voids. Here we show anomalous behaviour of SiO(2) glass in helium. Volume measurements clarify that SiO(2) glass is much less compressible than normal when compressed in helium, and the volume in helium at 10 GPa is close to the normal volume at 2 GPa. X-ray diffraction and Raman scattering measurements suggest that voids are prevented from contracting when compressed in helium because helium penetrates into them. The estimated helium solubility is very high and is between 1.0 and 2.3 mol per mole of SiO(2) glass at 10 GPa, which shows marked contrast with previous models. These results may have implications for discussions of the Earth's evolution as well as interpretations of various high-pressure experiments, and also lead to the creation of new materials.
二氧化硅（SiO2）玻璃具有网络结构，其中存在大量的间隙空隙。由于空隙的压缩，预计在高压下硅酸盐中的气体溶解度会变小。在这里，我们展示了氦气中二氧化硅玻璃的异常行为。体积测量结果表明，当在氦气中压缩时，SiO2 玻璃的可压缩性远低于正常情况，并且在 10 GPa 下的体积接近于在 2 GPa 下的正常体积。X 射线衍射和拉曼散射测量表明，当在氦气中压缩时，空隙被阻止收缩，因为氦气渗透到其中。估计的氦气溶解度非常高，在 10 GPa 时为每摩尔 SiO2 玻璃 1.0 到 2.3 摩尔，与以前的模型形成鲜明对比。这些结果可能对地球演化的讨论以及各种高压实验的解释都有影响，同时也导致了新材料的产生。
