Sound velocity and density measurements of liquid iron up to 800 GPa: A universal relation between Birch's law coefficients for solid and liquid metals
Sound velocity and density measurements of liquid iron up to 800 GPa: A universal relation between Birch's law coefficients for solid and liquid metals
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DOI：
10.1016/j.epsl.2014.02.019
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发表时间：
2014-04
影响因子：
5.3
通讯作者：
T. Sakaiya;Hideki Takahashi;T. Kondo;T. Kadono;Y. Hironaka;T. Irifune;K. Shigemori
中科院分区：
文献类型：
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作者：
T. Sakaiya;Hideki Takahashi;T. Kondo;T. Kadono;Y. Hironaka;T. Irifune;K. Shigemori
我们进行了压缩声速和密度测量液态铁在压力高达800 GPa的一个新的完善的冲击压缩方法，使用高功率激光。我们发现，声速作为密度的函数，可以拟合到一个线性关系，遵循伯奇定律的热稠密的液体以及铁的固相，固体和液体之间的斜率比约为1.5。比较固体和液体金属的Birch定律表明，在熔点密度下，液相中的声速比固相中的声速低约10%，熔点密度约为初始密度的1.5倍。我们认为，这些伯奇定律系数之间的关系沿着Hugoniot的固相和液相是普遍的金属。
We performed compressional sound velocity and density measurements on liquid iron at pressures up to 800 GPa with a newly refined shock-compression method using a high-power laser. We found that sound velocity as a function of density can be fitted to a linear relation following Birch's law for hot dense liquid as well as for the solid phase of iron, with a slope ratio between the solid and liquid of approximately 1.5. A comparison of Birch's law for solid and liquid metals indicates that the sound velocity in the liquid phase is about 10% lower than that in the solid phase at melting point density, which is about 1.5 times larger than the initial density. We suggest that these relations between Birch's law coefficients for solid and liquid phases along the Hugoniot are universal for metals.