Measurements of sound velocity in iron-nickel alloys by femtosecond laser pulses in a diamond anvil cell
Measurements of sound velocity in iron-nickel alloys by femtosecond laser pulses in a diamond anvil cell
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在金刚石砧座中用飞秒激光脉冲测量铁镍合金中的声速
DOI：
10.1007/s00269-018-0944-3
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发表时间：
2018
影响因子：
1.4
通讯作者：
Ohishi Yasuo
中科院分区：
文献类型：
--
作者：
Wakamatsu Tatsuya;Ohta Kenji;Yagi Takashi;Hirose Kei;Ohishi Yasuo
通过将地球中的地震波速度剖面与铁合金声速的实验室数据进行比较，我们可以推断地核中物质的化学成分。纯铁声速的测量已取得了很好的结果，而铁镍合金声速的实验研究还很有限。在这里，我们测量的六方密堆积（hcp）结构的铁的纵波速度高达29 GPa，Fe-5重量%的Ni，和Fe-15重量%的Ni高达64 GPa通过飞秒脉冲激光泵浦-探测技术和金刚石对顶砧单元在室温条件下的组合。我们发现，镍对铁基合金的声速的影响是弱于以前的实验研究所确定的。此外，我们还得到了Birch定律的参数：对于Fe-5wt%Ni，VP = 1146（57）ρ −3638（567）;对于Fe-15wt%Ni，VP = 1141（45）ρ−3808（446），其中VP为纵波速度（m/s），ρ为密度（g/cm ~ 3）。
By comparing the seismic wave velocity profile in the Earth with laboratory data of the sound velocity of iron alloys, we can infer the chemical composition of materials in the Earth’s core. The sound velocity of pure iron (Fe) has been sufficiently measured using various techniques, while experimental study on the sound velocity of iron–nickel (Fe–Ni) alloys is limited. Here, we measured longitudinal wave velocities of hexagonal-close-packed (hcp) structured Fe up to 29 GPa, Fe–5 wt% Ni, and Fe–15 wt% Ni up to 64 GPa via a combination of the femtosecond pulse laser pump–probe technique and a diamond anvil cell at room temperature condition. We found that the effect of Ni on the sound velocity of an Fe-based alloy is weaker than that determined by previous experimental study. In addition, we obtained the parameters of Birch’s law to beVP= 1146(57)ρ −3638(567) for Fe–5 wt% Ni andVP= 1141(45)ρ−3808(446) for Fe–15 wt% Ni, respectively, whereVPis longitudinal wave velocity (m/s) andρis density (g/cm3).