Sound velocity of Fe3C at high pressure and high temperature determined by inelastic X-ray scattering
Sound velocity of Fe3C at high pressure and high temperature determined by inelastic X-ray scattering
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DOI：
10.1016/j.crte.2018.09.005
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发表时间：
2019-01
影响因子：
1.4
通讯作者：
Suguru Takahashi;E. Ohtani;T. Sakamaki;S. Kamada;H. Fukui;S. Tsutsui;H. Uchiyama;D. Ishikawa
中科院分区：
文献类型：
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作者：
Suguru Takahashi;E. Ohtani;T. Sakamaki;S. Kamada;H. Fukui;S. Tsutsui;H. Uchiyama;D. Ishikawa
利用非弹性X射线散射法（IXS）测量了在33 ~ 86 GPa压力和2300 K温度范围内的Fe 3C声速。在室温下，Fe 3C的压缩速度（VP）和密度符合线性关系（Birch定律）。伯奇定律的温度依赖性没有被清楚地观察到，可以忽略不计。对于Fe 3 C的Birch定律表示为：VP = 1.09±0.14× ρ− 1.79±1.26。结果表明，初步参考地球模型（PREM）内核在内核边界（ICB）处的VP和VS（剪切速度）分别比Fe 3C小12%和48%，这可能是由纯铁类比的预熔效应或内核中Fe-Fe 3C混合物的部分熔融造成的。
The sound velocity of Fe 3 C was measured at pressures from 33 to 86 GPa and at ambient and high temperatures up to 2300 K using inelastic X-ray scattering (IXS) from laser-heated samples in diamond anvil cells (DACs). The compressional velocity (V P) and density of Fe 3 C at room temperature were observed to follow a linear relationship (Birch's law). The temperature dependency of Birch's law was not clearly observed and can be ignored. Birch's law for Fe 3 C is expressed by: V P= 1.09±0.14× ρ− 1.79±1.26. The result indicates that V P and V S (shear velocity) of the preliminary reference Earth model (PREM) inner core at the Inner Core Boundary (ICB) were by 12% and 48% smaller than those of Fe 3 C, which could be accounted for by the premelting effect by analogy from pure Fe or by partial melting of the Fe–Fe 3 C mixture in the inner core.