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The intrinsic effects of using rhenium gaskets in hydrothermal diamond anvil cell experiments on background fluorescence, contamination, and redox control

文献类型：期刊论文

作者Cheng, Nanfei2; Chou, I. -Ming2; Wan, Ye2; Wang, Ruoheng1,2; Zhang, Haiyan2; Chen, Ying2
刊名CHEMICAL GEOLOGY
出版日期2023-08-20
卷号632页码:14
ISSN号0009-2541
关键词HDAC Rhenium gasket Raman spectroscopy Background fluorescence Contamination Oxygen fugacity
DOI10.1016/j.chemgeo.2023.121535
通讯作者Chou, I. -Ming(imchou@idsse.ac.cn)
英文摘要Because of the great stiffness and high melting point of rhenium (Re) metal, Re gaskets are widely used in hy-drothermal diamond anvil cell (HDAC) experiments that involve aqueous fluids and even hydrous melts under high pressure-temperature (P-T) conditions. This metal was usually considered chemically inert in hydrothermal experiments, but some concerns have been raised about its reactivity with the fluids. Therefore, this commu-nication addresses the intrinsic effects of using Re gaskets in HDAC experiments, including background fluo-rescence in Raman spectroscopy, contamination, and redox control. A series of hydrothermal experiments involving rhenium were performed in pure water, H2O-NaCl, and SiO2-COH systems using the HDAC up to 28.9 kbar and 850 degrees C and fused silica capillary capsule (FSCC) up to 87 bar and 300 degrees C, and Raman spectroscopy was employed for in situ analysis. The results indicate that (1) strong background fluorescence, often occurring between 200 and 700 degrees C, is caused by the dissolution of Re gaskets and the formation of aqueous species of Re with a low oxidation state, such as a Re(2+)cation and eventually, its hydroxide complexes; (2) in addition to the fluorescent Re species and unwanted carbon species produced from the diamond-water reaction catalyzed by Re, a considerable amount of ReO4-, which does not cause fluorescence and shows a dominant Raman peak at similar to 970 cm(-1), is detected in the fluids either in situ at high temperatures above 700 degrees C or under cooling conditions, and it can reduce the activity of H2O and the pH of the fluids and interfere with the assignments of Raman peaks of other species in the samples; and (3) the production of oxidizing aqueous species at high temperatures, including ReO4- and CO2, is attributed to the substantial loss of H-2 and the corresponding increase in oxygen fugacity. Because of these intrinsic effects of using Re gaskets in HDAC experiments, implications for hydrothermal ex-periments are discussed with several previously reported examples such as the discrepancy in the solubility of rutile in water under elevated P-T conditions. Based on the results of the current and previous studies, four suggestions have also been made to minimize the unwanted effects of using Re gaskets, including the generation of a reduced experimental condition, a pre-heating treatment of Re gaskets, a gasket pre-indentation approach, and a gold-lined gasket method. Armed with the knowledge of these intrinsic effects as well as the advantages of using different HDAC metal gaskets, the researchers will be able to create appropriate experimental designs.
WOS关键词SUBDUCTION ZONE FLUIDS ; IN-SITU DETERMINATION ; X-RAY-DIFFRACTION ; O-H FLUID ; HIGH-PRESSURE ; AQUEOUS FLUIDS ; HIGH-TEMPERATURES ; SILICATE MELT ; RAMAN-SPECTROSCOPY ; THERMODYNAMIC DATA
资助项目National Nat-ural Science Foundation of China[42102056] ; National Nat-ural Science Foundation of China[42130109] ; National Nat-ural Science Foundation of China[41973055] ; 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:001001603800001
资助机构National Nat-ural Science Foundation of China ; Natural Science Foundation of Hainan Province of China
源URL[http://ir.idsse.ac.cn/handle/183446/10367]  
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 100049, Peoples R China
2.Chinese Acad Sci, Inst Deep Sea Sci & Engn, CAS Key Lab Expt Study Deep & Sea Extreme Condit, Sanya 572000, Hainan, Peoples R China
推荐引用方式
GB/T 7714		 Cheng, Nanfei,Chou, I. -Ming,Wan, Ye,et al. The intrinsic effects of using rhenium gaskets in hydrothermal diamond anvil cell experiments on background fluorescence, contamination, and redox control[J]. CHEMICAL GEOLOGY,2023,632:14.
APA Cheng, Nanfei,Chou, I. -Ming,Wan, Ye,Wang, Ruoheng,Zhang, Haiyan,&Chen, Ying.(2023).The intrinsic effects of using rhenium gaskets in hydrothermal diamond anvil cell experiments on background fluorescence, contamination, and redox control.CHEMICAL GEOLOGY,632,14.
MLA Cheng, Nanfei,et al."The intrinsic effects of using rhenium gaskets in hydrothermal diamond anvil cell experiments on background fluorescence, contamination, and redox control".CHEMICAL GEOLOGY 632(2023):14.

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来源：深海科学与工程研究所

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