Dubrovinsky LS, Saxena SK, Tutti F, Rekhi S, LeBehan T
Institute of Earth Sciences, Uppsala University, S-752 36 Uppsala, Sweden.
Phys Rev Lett. 2000 Feb 21;84(8):1720-3. doi: 10.1103/PhysRevLett.84.1720.
The density of varepsilon-iron has been calculated at pressures and temperatures up to 300 GPa and 1300 K, respectively. We observe varepsilon to beta phase transition at pressures between 135 and 300 GPa and temperature above 1350 K; the pattern can be interpreted in terms of double hexagonal close-packed structure. The density calculated at high pressure and temperature (330-360 GPa and 5000-7000 K) closely matches with preliminary reference Earth model density, thereby imposing constraint on the composition of the Earth's inner core.
分别计算了在高达300吉帕斯卡的压力和1300开尔文的温度下ε铁的密度。我们观察到在135至300吉帕斯卡的压力和高于1350开尔文的温度下，ε相向β相的转变；这种模式可以用双六方密堆积结构来解释。在高压和高温（330 - 360吉帕斯卡和5000 - 7000开尔文）下计算出的密度与初步参考地球模型密度密切匹配，从而对地球内核的组成施加了限制。
