New high-pressure B2 phase of FeS above 180 GPa
New high-pressure B2 phase of FeS above 180 GPa
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DOI：
10.2138/am.2008.2762
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发表时间：
2008-02
影响因子：
3.1
通讯作者：
N. Sata;H. Ohfuji;K. Hirose;H. Kobayashi;Y. Ohishi;N. Hirao
中科院分区：
文献类型：
--
作者：
N. Sata;H. Ohfuji;K. Hirose;H. Kobayashi;Y. Ohishi;N. Hirao
摘要FeS在高温高压下表现出广泛的多晶型。均为NiAs型（B8）或与其密切相关的结构。在这里，我们报告了一个新的相变从FeS VI CsCl型（B2）相（FeS VII）高于180 GPa的基础上同步辐射X射线衍射（XRD）测量。一个显着的体积减少了3.0%，观察到在相变，由于从6到8的配位数的增加。目前的研究结果表明，大量的硫可能被纳入一个铁镍合金的体心立方结构在地球的内核。
Abstract FeS exhibits extensive polymorphism at high pressure and temperature. All with NiAs-type (B8) or closely related structures. Here we report a new phase transition from FeS VI to CsCl-type (B2) phase (FeS VII) above 180 GPa based on the synchrotron X-ray diffraction (XRD) measurements. A significant volume reduction by 3.0% was observed at the phase transition, due to an increase in the coordination number from six to eight. Present results suggest that a substantial amount of sulfur may be incorporated into an Fe-Ni alloy with bcc structure in the Earth’s inner core.