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首页> 外文期刊>Physics of the Earth and Planetary Interiors: A Journal Devoted to Obsevational and Experimerntal Studies of the Chemistry and Physics of Planetary Interiors and Their Theoretical Interpretation >New accurate compression data for γ-Fe_2SiO_4
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New accurate compression data for γ-Fe_2SiO_4

机译：γ-Fe_2SiO_4的新精确压缩数据

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摘要

The equation of state for γ-Fe_2SiO_4 was determined by single-crystal X-ray diffraction up to 10.2GPa at room temperature. The pressure-volume data, measured at 10 different pressures, do not show any evidence of a phase transformation and were fit by a third-order Birch-Murnaghan equation of state. The following coefficients were refined simultaneously: V_0=559.44(6)?~3, K_(T0)=187.3(1.7)GPa, and K'=5.5(4). This result implies that the Mg/Fe substitution along the γ-Fo-Fa join does not significantly affect the bulk modulus. The sample shows higher K' than other compositions along the Fo-Fa join, which generally have K'～4. Based on our results we can calculate the sound bulk velocity of γ-Fe_2SiO_4 up to the pressures of the Transition Zone. Due to the larger K' of γ-Fe_2SiO_4, the difference in bulk sound velocity between the two end-members decreases with increasing pressure.
机译：γ-Fe_2SiO_4的状态方程通过室温下高达10.2GPa的单晶X射线衍射确定。在10个不同压力下测得的压力-体积数据没有显示任何相变迹象，并且通过三阶Birch-Murnaghan状态方程拟合。同时细化以下系数：V_0 ＝ 559.44（6）≤〜3，K_（T0）＝ 187.3（1.7）GPa，并且K′＝ 5.5（4）。该结果表明，沿着γ-Fo-Fa连接的Mg / Fe取代不会显着影响体积模量。样品沿Fo-Fa连接处的其他组分的K'值较高，一般为K'〜4。根据我们的结果，我们可以计算出直至过渡带压力下的γ-Fe_2SiO_4的声速。由于γ-Fe_2SiO_4的K'较大，两个端部构件之间的体声速差随压力的增加而减小。

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