文献类型：期刊文献

英文题名：Raman Spectroscopic Studies of Pyrite at High Pressure and High Temperature

作者：Chen, Juan Li, Heping Yuan, Yi Zhang, Mengxue Shuai, Shuhang Wan, Jingjing

第一作者：陈娟

通信作者：Li, HP[1]

机构：[1]Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Peoples R China;[2]Chinese Acad Sci, Inst Geochem, Key Lab High Temp & High Pressure Study Earths In, Guiyang 550081, Peoples R China;[3]Guizhou Inst Technol, Anal & Testing Ctr, Guiyang 550003, Peoples R China

第一机构：贵州理工学院化学工程学院

通信机构：corresponding author), Chinese Acad Sci, Inst Geochem, Key Lab High Temp & High Pressure Study Earths In, Guiyang 550081, Peoples R China.

年份：2022

卷号：12

期号：3

外文期刊名：MINERALS

收录：;Scopus(收录号：2-s2.0-85126024676);WOS:【SCI-EXPANDED(收录号:WOS:000774141800001)】；

基金：This research is supported by the fund from the Science and Technology Agency of Guizhou province, China ([2020]1Y170 and [2019]2830).

语种：英文

外文关键词：pyrite; Raman spectroscopy; high pressure; high temperature

摘要：Variations in the Raman spectra of pyrite were studied from 113 to 853 K at room pressure with a Linkam heating and freezing stage, and for 297-513 K and pressures up to 1.9 GPa with a hydrothermal diamond anvil cell. All observed frequencies decreased continuously with an increase in temperatures up to 653 K at ambient pressure. Hematite began to form at 653 K, all pyrite had transformed to hematite (H) at 688 K, and the hematite melted at 853 K. An increase in temperature at every initial pressure (group 1: 0.5 GPa, group 2: 1.1 GPa, group 3: 1.7 GPa, group 4: 1.9 GPa), showed no evidence for chemical reaction or pyrite decomposition. Two or three Raman modes were observed because of crystal orientation or temperature-induced fluorescence effects. The pressure groups showed a decreasing trend of frequency with gradual heating. The interaction of pressure and temperature led to a gradual decrease in Ag and Eg mode at a lower pressure (0.5 GPa and 1.1 GPa) than other pressure groups. Pressure and temperature effects are evident for groups 1 and 2; however, for groups 3 and 4, the temperature shows a larger effect than pressure and leads to a sharp decrease in Ag and Eg modes.