期刊
MINERALS
卷 10, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/min10020099
关键词
goethite; high-pressure; Raman spectroscopy; x-ray di ffraction; electrical impedance spectroscopy; electrical resistance; phase transition
资金
- DOE-NNSA's Office of Experimental Sciences
- DOE Office of Science [DE-AC02-06CH11357]
- NSAF [U1530402]
- Youth science foundation of Changchun University of Science and Technology [XQNJJ-2018-15]
- Jilin Province Science and Technology Development Program, China [20170520119JH]
- NSF [EAR-1723185]
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 V-0 = 138.9 +/- 0.5 angstrom(3) and K-0 = 126 +/- 5 GPa.
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