顽火辉石的高温高压同步辐射研究

马艳梅; 周强; 杨凯峰; 李雪飞; 沈龙海; 崔启良; 刘景; 邹广田

doi:10.11858/gywlxb.2006.01.003

顽火辉石的高温高压同步辐射研究

doi: 10.11858/gywlxb.2006.01.003

1.
吉林大学超硬材料国家重点实验室，吉林长春 130012；
2.
中国科学院高能物理研究所，北京 100039

详细信息

通讯作者:
崔启良

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出版历程
- 收稿日期: 2005-10-10
- 修回日期: 2005-12-17
- 发布日期: 2006-03-05

Synchrotron Radiation Diffraction of Enstatite under High Temperature and High Pressure

1.
National Laboratory of Superhard Materials, Jilin University, Changchun 130012, China;
2.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China

More Information

Corresponding author: CUI Qi-Liang

摘要

摘要: 采用同步辐射能量色散X射线衍射技术、激光加热技术和金刚石对顶砧（DAC）高压装置，在温度为2 000 K和压力为23 GPa的范围内，对采自地幔二辉橄榄岩中的顽火斜方辉石，进行了原位的高温高压能量色散X射线衍射（EDXRD）测量。实验结果表明：当压力为15.3 GPa、温度为1 600 K时（相当于地球内部410 km处的地震波不连续界面的温压环境），顽火斜方辉石转变为橄榄石的相瓦兹利石（Wadsleyite）相；继续加温加压至2 000 K、23 GPa时（相当于地球内部670 km处的地震波不连续界面的温压环境），顽火斜方辉石相变为钛铁矿（Ilmenite）结构和钙钛矿（Perovskite）结构的混和相。实验结果进一步证明，在地幔中存在的两个地震波不连续界面是由橄榄石、顽火斜方辉石等矿物的相变引起的。
- 顽火斜方辉石 /
- 同步辐射 /
- 高温高压 /
- 相变 /
- X射线衍射 /
- 金刚石对顶砧（DAC）
Abstract: In-situ energy dispersive X-ray diffraction measurements of enstatite have been studied by using diamond anvil cell (DAC) with synchrotron radiation and laser heating in the range of 0~23 GPa and 293~2 000 K. We have found that enstatite transform to wadsleyite phase at 15.3 GPa and 1 600 K. At temperatures up to 2 000 K and pressure up to 23 GPa we have observed mixed phase of ilmenite and perovskite structure. The experiment further demonstrates that the density and seismic-wave velocity jumps are attributed to the phase transition of olivine and enstatite minerals.
- enstatite /
- synchrotron radiation /
- high-temperatue high pressure /
- phase transition /
- X-ray diffraction /
- diamond anvil cell (DAC)

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参考文献(12)

Xie H S. Materials Science of the Earth's Interior [M]. Beijing: Sciences Press, 1997: 149-150. (in Chinese)

谢鸿森. 地球深部物质科学导论 [M]. 北京: 科学出版社, 1997: 149-150.

Peng W Sh, XIE H S, Zhang Y M, et al. Infrared Spectroscopic Study of Synthesis Pyroxene Series [J]. Acta Mineralogical Sinica, 1986, 6(4): 308-314.

彭文世, 谢鸿森, 张月明, 等. 合成斜方辉石系列的红外光谱研究矿物学报 [J]. 矿物学报, 1986, 6(4): 308-314.

Chudinovskikh L, Boehler R. High-Pressure Polymorphs of Olivine and the 660 km Seismic Discontinuity [J]. Nature, 2001, 411: 574-577.

Shim S H, Duffy T S, Shen G. The Post-Spinel Transformation in Mg2SiO4 and Its Relation to the 660 km Seismic Discontinuity [J]. Nature, 2001, 411: 571-573.

Liudmila Chudinovskikh, Reinhard Boehler. MgSiO3 Phase Boundaries Measured in the Laser-Heated Diamond Cell [J]. Earth and Planet Sci Lett, 2004, 219: 285-296.

Kuroda K, Irifune T, Inoue T, et al. Determination of the Phase Boundary between Ilmenite and Perovskite in MgSiO3 by in Situ X-Ray Diffraction and Quench Experiments [J]. Phys Chem Miner, 2000, 27: 523-532.

Gasparik T. Phase Relations in the Transition Zone [J]. J Geophys Res, 1990, 95: 15751-15769.

Hirose K, Komabayashi T, Murakami M, et al. In Situ Measurements of the Majorite-Akimotoite-Perovskite Phase Transition Boundaries in MgSiO3 [J]. Geophys Res Lett, 2001, 22: 4351-4354.

Liu J, Zhao J, Che R Zh, et al. In Situ Energy Dispersive Diffraction under High Pressure Using Synchrotron Radiation [J]. Chinese Journal of High Pressure Physics, 2000, 14(4): 247-252. (in Chinese)

刘景, 赵菁, 车荣钲, 等. 高压下的同步辐射能量色散粉末衍射 [J]. 高压物理学报, 2000, 14(4): 247-252.

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