In-situ redox conditions in hydrothermal diamond-anvil cell experiments using various metal gaskets
文献类型：期刊论文
| 作者 | Wang, Ruoheng1,2 ; Chou, I-Ming2
|
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2023-10-05 |
| 卷号 | 636页码:13 |
| ISSN号 | 0009-2541 |
| 关键词 | Hydrothermal diamond-anvil cells Raman spectroscopy Oxygen fugacity In-situ hydrogen quantification Metal gasket Mo-MoO2 buffer |
| DOI | 10.1016/j.chemgeo.2023.121649 |
| 通讯作者 | Chou, I-Ming(imchou@idsse.ac.cn) |
| 英文摘要 | Hydrothermal diamond-anvil cells (HDACs) have been widely used in various research fields since they were introduced in 1993. Unlike temperature (T) and pressure (P), the redox states of the samples in HDAC experiments were poorly controlled or measured; they were usually estimated by observing the reduction/disappearance of redox-sensitive mineral(s) (e.g., Mo metal) and corresponding formation and growth of such mineral (s) (e.g., MoO2) without in-situ redox measurement. In this study, we demonstrated the generation of H2 during experiments using various metal gaskets, including inert (Re) and chemically more reactive metals (Ni, Co, Mo, and W), in the pure H2O system under various P-T conditions. A technique for quantitative Raman spectroscopic analysis of H2 in HDAC is designed. Based on this technique, the oxygen fugacity (fO2) values of Mo-MoO2 buffer at the experimental P-T conditions were then calculated from these measured H2 pressures. We demonstrated that steady-state redox control can be maintained at a fixed T between 400 and 500 degrees C in HDAC experiments using a Mo gasket for durations of up to two hours and for those using a Re gasket with an additional Mo rod in the sample between 400 and 800 degrees C for durations of up to 90 min, regardless of the considerable changes in sample pressure. This demonstration was established by the balance between the rates of H2 generation and H2 loss from the sample chamber. The loss of H2 enhanced the consumption of H2O and therefore reduced the sample pressures during the experiments. We believe that hydrogen contents in every HDAC experiment, which attempt to control the redox state, need in situ measurement, then estimate the real redox state and compare it to thermodynamic equilibrium prediction. To enhance in situ redox control and measurements, modifications of HDAC are required for improving the quantitative Raman spectroscopic analysis technique in both sensitivity and accuracy. |
| WOS关键词 | HIGH-TEMPERATURES ; ELEVATED-TEMPERATURES ; THERMODYNAMIC DATA ; HIGH-PRESSURE ; FREE-ENERGY ; RAMAN ; CALIBRATION ; FUGACITY ; FLUIDS ; WATER |
| 资助项目 | National Natural Science Foundation of China[41973055] ; National Natural Science Foundation of China[42130109] ; Natural Science Foundation of Hainan Province of China[423MS106] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:001067004100001 |
| 资助机构 | National Natural Science Foundation of China ; Natural Science Foundation of Hainan Province of China |
| 源URL | [http://ir.idsse.ac.cn/handle/183446/10509]  |
| 专题 | 深海科学研究部_深海极端环境模拟研究实验室 研究生部 |
| 通讯作者 | Chou, I-Ming |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Deep Sea Sci & Engn, CAS Key Lab Expt Study Deep Sea Extreme Condit, Sanya 572000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Ruoheng,Chou, I-Ming. In-situ redox conditions in hydrothermal diamond-anvil cell experiments using various metal gaskets[J]. CHEMICAL GEOLOGY,2023,636:13. |
| APA | Wang, Ruoheng,&Chou, I-Ming.(2023).In-situ redox conditions in hydrothermal diamond-anvil cell experiments using various metal gaskets.CHEMICAL GEOLOGY,636,13. |
| MLA | Wang, Ruoheng,et al."In-situ redox conditions in hydrothermal diamond-anvil cell experiments using various metal gaskets".CHEMICAL GEOLOGY 636(2023):13. |
入库方式： OAI收割
来源：深海科学与工程研究所
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