天然橄榄石单晶的压缩性

秦霏 王英 巫翔 秦善 李晖 李晓东 杨科

秦霏, 王英, 巫翔, 秦善, 李晖, 李晓东, 杨科. 天然橄榄石单晶的压缩性[J]. 高压物理学报, 2016, 30(1): 20-26. doi: 10.11858/gywlxb.2016.01.003
引用本文: 秦霏, 王英, 巫翔, 秦善, 李晖, 李晓东, 杨科. 天然橄榄石单晶的压缩性[J]. 高压物理学报, 2016, 30(1): 20-26. doi: 10.11858/gywlxb.2016.01.003
QIN Fei, WANG Ying, WU Xiang, QIN Shan, LI Hui, LI Xiao-Dong, YANG Ke. Compressibility of Natural Olivine Single-Crystals[J]. Chinese Journal of High Pressure Physics, 2016, 30(1): 20-26. doi: 10.11858/gywlxb.2016.01.003
Citation: QIN Fei, WANG Ying, WU Xiang, QIN Shan, LI Hui, LI Xiao-Dong, YANG Ke. Compressibility of Natural Olivine Single-Crystals[J]. Chinese Journal of High Pressure Physics, 2016, 30(1): 20-26. doi: 10.11858/gywlxb.2016.01.003

天然橄榄石单晶的压缩性

doi: 10.11858/gywlxb.2016.01.003
基金项目: 

国家自然科学基金 U1232204

国家自然科学基金 11075175

详细信息
    作者简介:

    秦霏(1991-), 女, 博士研究生, 主要从事地球高温高压晶体化学研究.E-mail:fei.qin@pku.edu.cn

    通讯作者:

    巫翔(1978-), 男, 博士, 研究员, 主要从事实验地球化学及矿物物理研究.E-mail:xiang.wu@pku.edu.cn

  • 中图分类号: O521.2

Compressibility of Natural Olivine Single-Crystals

  • 摘要: 采用金刚石对顶砧高压装置和同步辐射X射线衍射技术,在常温下对两种天然橄榄石单晶(含铁的铁镁橄榄石(Mg1.83Fe0.17)SiO4和不含铁的纯镁橄榄石Mg2SiO4)进行了高压结构行为研究。实验结果表明,两种天然橄榄石单晶在最高压力为9.9GPa的条件下没有发生相变。采用二阶Birch-Murnaghan状态方程描述压力-晶胞体积(p-V)关系,获得了铁镁橄榄石和纯镁橄榄石在零压下的晶胞体积(0.2929(3)、0.2899(1)nm3)和体积模量(140(3)、151(2)GPa)。两种镁橄榄石呈高度各向异性,轴压缩性表现为:b轴的压缩率最大,c轴次之,a轴的压缩率最小。随着铁组分的加入,橄榄石的体波速减小,两种橄榄石的体波速相差5.2%,该结果对于研究上地幔的物质构成和弹性波速具有一定的意义。

     

  • 图  纯镁橄榄石和铁镁橄榄石单晶的XRD谱(方框所示为实验所得的单晶衍射点,数字表示对应的指标化结果;“D”表示金刚石的衍射点,衍射环为压标Au的衍射环)

    Figure  1.  Single-crystal XRD patterns of Fe-free forsterite and Fe-bearing forsterite (Squares show single-crystal diffraction peaksand figures indicate indexed results.'D' represents diamond reflections, while the diffraction rings in the patterns are from Au)

    图  铁镁橄榄石和纯镁橄榄石在常温下的p-V关系

    Figure  2.  p-V relationship for Fe-bearing forsteriteand Fe-free forsterite at 300K

    图  晶胞参数(abc)随压力的变化

    Figure  3.  Lattice parameters a, b and c as a function of pressure

    图  常温下橄榄石的体波速随压力的变化

    Figure  4.  Bulk velocity as a function of pressure

    表  1  不同压力下铁镁橄榄石和纯镁橄榄石的晶胞参数

    Table  1.   Unit-cell parameters of Fe-bearing and Fe-free forsterite at various pressures

    Material p/(GPa) a/(nm) b/(nm) c/(nm) V/(nm3)
    Fe-free forsterite 0.0001 0.47382(6) 1.0218(2) 0.59817(5) 0.28961(6)
    0.5 0.47283(4) 1.0236(1) 0.59743(4) 0.28917(3)
    1.2 0.47279(4) 1.0206(2) 0.59637(4) 0.28776(6)
    2.9 0.47124(4) 1.0168(2) 0.59438(4) 0.28481(6)
    4.0 0.47015(4) 1.0149(2) 0.59275(4) 0.28284(6)
    5.3 0.46926(4) 1.0126(2) 0.59106(4) 0.28060(6)
    6.2 0.46872(4) 1.0089(2) 0.58968(4) 0.27885(6)
    7.0 0.46810(4) 1.0085(2) 0.58839(4) 0.27777(6)
    7.7 0.46761(4) 1.0077(2) 0.58746(4) 0.27667(6)
    8.7 0.46677(4) 1.0043(2) 0.58692(4) 0.27514(6)
    9.9 0.46609(4) 1.0013(2) 0.58564(4) 0.27240(5)
    Fe-bearing forsterite 0.0001 0.47832(2) 1.0150(1) 0.60201(5) 0.29230(4)
    2.6 0.47847(7) 1.0114(1) 0.59514(3) 0.28801(3)
    4.1 0.47840(7) 1.0070(2) 0.59284(2) 0.28561(3)
    4.8 0.47682(7) 1.0058(2) 0.59165(3) 0.28376(3)
    5.8 0.47538(8) 1.0047(2) 0.59022(2) 0.28200(3)
    7.0 0.47413(8) 1.0023(2) 0.58876(3) 0.27979(4)
    7.6 0.47407(8) 1.0000(2) 0.58805(3) 0.27880(3)
    8.4 0.47306(8) 0.9996(2) 0.58687(2) 0.27753(3)
    9.1 0.47199(9) 0.9984(3) 0.58630(2) 0.27628(4)
    9.7 0.47122(8) 0.9982(3) 0.58553(4) 0.27542(3)
    下载: 导出CSV

    表  2  橄榄石的状态方程参数

    Table  2.   Equation of state parameters for olivines

    Composition V0/(nm3) K0/(GPa) pmax/(GPa) Pressurecalibration Pressuremedium Method Reference
    Mg2SiO4 289.9(1) 151(2)a 9.9 Au ME XRD(SC) This study
    Mg2SiO4 289.7(3) 132(6)a 5.0 Olivine XRD(SC) Ref.[11]
    Mg2SiO4 255 128(8)a 41.8 Ruby XRD(PD) Ref.[21]
    Mg2SiO4 290.14(9) 125(2)a 17.2 Ruby ME XRD(SC) Ref.[20]
    Mg1.84Fe0.16SiO4 292.5(1) 128.8(5)a 8.0 Quartz MEW XRD(SC) Ref.[22]
    Mg1.83Fe0.17SiO4 292.9(3) 140(3)a 9.7 Au ME XRD(SC) This study
    Mg1.8Fe0.2SiO4 290.4(5) 131(1)a 9.7 Ruby ME XRD(SC) Ref.[23]
    Mg1.66Fe0.34SiO4 269 134(10)a 34 Ruby XRD(PD) Ref.[21]
    Mg1.6Fe0.4SiO4 294.6(1) 129.4(5)a 7.4 Quartz MEW XRD(SC) Ref.[4]
    Mg1.42Fe0.58SiO4 296.6(2) 129.4(5)a 8.2 Quartz MEW XRD(SC) Ref.[4]
    Mg2SiO4 128.8(5)b 16.2 Ruby Ar/He/ME BS Ref.[8]
    Mg1.8Fe0.2SiO4 292.0(1) 131(2)c 32.4 Quartz ME BS Ref.[24]
      Note:(1) Superscript letter a represents refitting K0 with fixed K0=4;
    (2) Superscript letter b represents that K0 was based on Brillouin scattering, and K0 was 4.2(2);
    (3) Superscript letter c represents that K0 was based on Brillouin scattering, and K0 was 3.8(2);
    (4) ME:4:1 methanol-ethanol mixture; MEW:16:3:1 methanol-ethanol-water mixture; SC:single crystal; PD:powder; BS:Brillouin scattering.
    下载: 导出CSV
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  • 收稿日期:  2015-02-01
  • 修回日期:  2015-04-17

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