High-pressure behavior of osmium: An analog for iron in Earth’s core
High-pressure behavior of osmium: An analog for iron in Earth’s core
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锇的高压行为：地核中铁的类似物
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
R. Jeanloz
中科院分区：
文献类型：
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作者：
B. Godwal;Jinyuan Yan;S. Clark;R. Jeanloz
高分辨率X射线衍射与金刚石压砧单元，使用氩气作为准流体静压介质，文件的晶体结构和状态方程的锇在室温下超过60 GPa。我们发现零压体积模量与其他实验以及相对论电子能带结构计算的公平协议：锇是dennial，但不是最不可压缩的元素在环境条件下。我们也没有发现异常的证据，在单位细胞参数的比率，C/A，或在作为压力的函数的锇的可压缩性。这与其他实验和量子力学计算结果相一致，但与最近关于锇的电子结构和状态方程在15-25 GPa压力下表现出异常的说法不一致;差异可能是由于织构的影响。
High-resolution x-ray diffraction with diamond-anvil cells, using argon as a quasi-hydrostatic pressure medium, documents the crystal structure and equation of state of osmium to over 60 GPa at room temperature. We find the zero-pressure bulk modulus in fair agreement with other experiments as well as with relativistic electronic band-structure calculations: Osmium is the densest but not the most incompressible element at ambient conditions. We also find no evidence for anomalies in the ratio of unit-cell parameters, c/a, or in the compressibility of osmium as a function of pressure. This is in agreement with other experiments and quantum mechanical calculations but disagrees with recent claims that the electronic structure and equation of state of osmium exhibit anomalies at pressures of ∼15-25 GPa; the discrepancies are may be due to the effects of texturing.