Study on the High-Pressure Behavior of Goethite up to 32 GPa Using X-Ray Diffraction, Raman, and Electrical Impedance Spectroscopy
Study on the High-Pressure Behavior of Goethite up to 32 GPa Using X-Ray Diffraction, Raman, and Electrical Impedance Spectroscopy
复制标题
DOI：
10.3390/min10020099
复制
发表时间：
2020-01
期刊：
影响因子：
2.5
通讯作者：
Ruilian Tang;Jiuhua Chen;Q. Zeng;Yan Li;Xue Liang;Bin Yang;Yu Wang
中科院分区：
文献类型：
--
作者：
Ruilian Tang;Jiuhua Chen;Q. Zeng;Yan Li;Xue Liang;Bin Yang;Yu Wang
针铁矿是地球上主要的含铁沉积矿物。在这项研究中，我们使用金刚石顶压室(DAC)在室温和高达32 Gpa的高压下对针铁矿进行了现场高压X射线衍射、拉曼光谱和阻抗谱测量。我们观察到拉曼光谱和电阻在大约5和11 GPa时的特征变化。然而，X-射线衍射图在整个研究压力范围内没有显示出结构相变。得到的压力-体积(P-V)数据显示了一条平滑的压缩曲线，没有明显的证据表明存在任何二级相变。用二阶Birch-Murnaghan状态方程对体积数据进行拟合，得到V0=138.9±0.5A3，K0=126±5 Gpa。
Goethite is a major iron-bearing sedimentary mineral on Earth. In this study, we conducted in situ high-pressure x-ray diffraction, Raman, and electrical impedance spectroscopy measurements of goethite using a diamond anvil cell (DAC) at room temperature and high pressures up to 32 GPa. We observed feature changes in both the Raman spectra and electrical resistance at about 5 and 11 GPa. However, the x-ray diffraction patterns show no structural phase transition in the entire pressure range of the study. The derived pressure-volume (P-V) data show a smooth compression curve with no clear evidence of any second-order phase transition. Fitting the volumetric data to the second-order Birch–Murnaghan equation of state yields V0 = 138.9 ± 0.5 A3 and K0 = 126 ± 5 GPa.