高压下Fe92.5O2.2S5.3的熔化温度

冯磊 黄海军 冷春蔚 杨刚

冯磊, 黄海军, 冷春蔚, 杨刚. 高压下Fe92.5O2.2S5.3的熔化温度[J]. 高压物理学报, 2017, 31(6): 698-706. doi: 10.11858/gywlxb.2017.06.004
引用本文: 冯磊, 黄海军, 冷春蔚, 杨刚. 高压下Fe92.5O2.2S5.3的熔化温度[J]. 高压物理学报, 2017, 31(6): 698-706. doi: 10.11858/gywlxb.2017.06.004
FENG Lei, HUANG Hai-Jun, LENG Chun-Wei, YANG Gang. Melting Temperatures of Fe92.5O2.2S5.3 under High Pressure[J]. Chinese Journal of High Pressure Physics, 2017, 31(6): 698-706. doi: 10.11858/gywlxb.2017.06.004
Citation: FENG Lei, HUANG Hai-Jun, LENG Chun-Wei, YANG Gang. Melting Temperatures of Fe92.5O2.2S5.3 under High Pressure[J]. Chinese Journal of High Pressure Physics, 2017, 31(6): 698-706. doi: 10.11858/gywlxb.2017.06.004

高压下Fe92.5O2.2S5.3的熔化温度

doi: 10.11858/gywlxb.2017.06.004
基金项目: 

国家自然科学基金优秀青年科学基金 41322028

国家重点基础研究发展计划(973计划) 2014CB845904

中央高校基本科研业务费专项资金 2014-Ⅶ-006

中央高校基本科研业务费专项资金 2015Ⅲ035

详细信息
    作者简介:

    冯磊(1987-), 男, 硕士, 主要从事固体地球物理研究.E-mail:feng_lei@whut.edu.cn

    通讯作者:

    黄海军(1976-), 男, 博士, 教授, 主要从事高温高压凝聚态物理及固体地球物理研究. E-mail:hjhuang@whut.edu.cn

  • 中图分类号: O521.2;P3

Melting Temperatures of Fe92.5O2.2S5.3 under High Pressure

  • 摘要: 采用反向碰撞法与光分析技术,测量了Fe92.5O2.2S5.3(质量分数比)在208 GPa下的声速,发现固态Fe92.5O2.2S5.3的纵波声速在144 GPa下开始减小,直到165 GPa完全转变为液态体波声速,表明样品的完全熔化温度为(3 500±400)K。将该熔化温度作为参考点,应用Lindeman定律并外推至地球内外核边界可知,Fe92.5O2.2S5.3的熔化温度为(5 000±400)K。通过比较Fe、Fe-O、Fe-S以及Fe-O-S的熔化温度,发现O元素对Fe熔化温度的影响很小,S元素对Fe熔化温度的降低与其含量成正比。如果外地核中S的质量分数为2%~6%,则地球内外核界面温度为5 000~5 400 K。

     

  • 图  反向碰撞法实验装置图(a)和反向碰撞法波系作用图(b)

    Figure  1.  Sample configuration (a) and wave interaction (b) for sound velocity measurements in the reverse impact method

    图  实验No.081225和No.081226的界面粒子速度历史

    Figure  2.  Particle velocity histories at the impact interface for experiments No.081225 and No.081226

    图  拉格朗日声速与粒子速度的关系

    Figure  3.  Lagrangian sound velocity vs.particle velocity

    图  采用光分析技术测量声速的实验装置

    Figure  4.  Experimental configuration for sound velocity measurements using optical analyzer technique

    图  光分析技术测量声速实验中波的传播

    Figure  5.  Wave interaction for sound velocity measurements in optical analyzer technique

    图  实验No.110505在198 GPa下的粒子速度历史

    Figure  6.  Particle velocity history for experiment No.110505 at 198 GPa

    图  实验No.110505在198 GPa下的时间差Δt与样品厚度的关系

    Figure  7.  Time intervals Δt vs.sample thickness for experiment No.110505 at 198 GPa

    图  Fe92.5O2.2S5.3的声速与冲击压强的关系

    Figure  8.  Sound velocity of Fe92.5O2.2S5.3 vs.shock pressure

    图  Fe、Fe-O、Fe-S、Fe-O-S体系在高压下的熔化温度和液相线温度随压强的变化(红色实线为本研究得到的Fe92.5O2.2S5.3的熔化温度。Fe:Ma等[40],标记为M04;Anzellini等[39],标记为A13。Fe-O-S体系:Terasaki等[28],标记为T11;Huang等[14],标记为H10。Fe-S体系:Kamada等[26],标记为K12。)

    Figure  9.  Melting temperature of Fe-O-S system compared with those of Fe, Fe-O and Fe-S (The red solid line shows the melting temperature of Fe92.5O2.2S5.3 from this study.The lines labeled as M04 and A13 represent the melting temperatures of Fe from Ref.[40] and Ref.[39] respectively.The dashed lines labeled as H10 and T11 represent the melting temperature of Fe90O8S2[14] and the liquidus and solidus temperature of Fe-O-S[28].K12 represent the melting relationships in the Fe-Fe3S system up to the outer core conditions[26].)

    图  10  高压下Fe-S与Fe-O-S体系液相线温度的比较

    Figure  10.  Comparison of liquid-phase temperature between Fe-S and Fe-O-S system under high pressure

    表  1  Fe、FeO、FeS和Fe-O-S体系参数

    Table  1.   Parameters for Fe, FeO, FeS and Fe-O-S system

    Material ρ0/(g/cm3) C0/(km/s) λ γ0 q β0/(J·kg-1·K-2) κ E0/(kJ)
    α-Fe 7.85[43] 3.935[43] 1.578[43]
    ε-Fe 8.298[44] 4.720* 1.523* 1.76* 0.76* 0.091[45] 1.34[45] 76.268 4[44]
    FeO(B1) 5.71[46] 5.83* 0.99* 57.796 7[47]
    FeO(B8) 6.05[46, 48] 4.486* 1.699* 1.8[48] 1[48] 0[49] 0[49]
    FeS 4.602[50] 2.947[50] 1.578[50] 1.54[50] 1[50] 0.25[51] 1.34[51] 33.707 5[52]
    Fe90O8S2 6.69[14] 3.97[14] 1.58[14] 1.85[14] 0.87[14] 0.075[14] 1.39[14] 67.315
    Fe92.5O2.2S5.3 6.88 3.71 1.61 1.82 0.85 0.119 1.407 68.258
    Note:The asterisk * represents the fitted results from the Hugoniot data.
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