| 论文题目 | Refinement of the alpha-beta quartz phase boundary based on in situ Raman spectroscopy measurements in hydrothermal diamond-anvil cell and an evaluated equation of state of pure H2O |
| 论文题目（英文） | Refinement of the alpha-beta quartz phase boundary based on in situ Raman spectroscopy measurements in hydrothermal diamond-anvil cell and an evaluated equation of state of pure H2O |
| 作者 | 李胜虎;周義明* |
| 发表年度 | 2022-05-03 |
| 卷 | 1 |
| 期 | |
| 页码 | 12 |
| 期刊名称 | JOURNAL OF RAMAN SPECTROSCOPY |
| 摘要 | |
| 摘要_英文 |
In this study, we determined the alpha-beta quartz phase transition temperatures (Ttrs; up to similar to 924 degrees C for a total of 23 obtained under 0.1 MPa and elevated pressures) in a hydrothermal diamond-anvil cell (HDAC) at H2O pressures up to similar to 1310 MPa by using in situ Raman spectroscopy. When compared with the commonly used alpha-quartz Raman band near 465 cm-1 (at 24 degrees C and 0.1 MPa), the one near 128 cm-1 is much more sensitive for detecting Ttr. The corresponding phase transition pressure (Ptr) at each measured T-tr was calculated from three equations of state (EoS) of pure H2O. The corresponding three alpha-beta quartz phase boundaries were compared with those derived from previous experimental results. The best fitted one can be represented by: Ptr (+/- 5.6 MPa) = 0.0008.Ttr2+ 2.8056.Ttr - 1877.5, where 574 degrees C <= (tr) <= 889 degrees C with R2 = 0.9998. Our results agree, within experimental uncertainties, with most of previous experimental data, and our newly determined alpha-beta quartz P-tr-Ttr phase boundary can be used as a reliable pressure calibrant in HDAC. Furthermore, the experimental procedures used in this study, including the use of Raman spectroscopy criterion for Ttr determination, can be easily applied to obtain improved EoS of geologically important aqueous solutions containing salt(s) at pressure-temperature conditions up to similar to 1.2 GPa-900 degrees C.
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