研究目的
Investigating the phase transitions and dehydration of chalcanthite at high-pressure and high-temperature conditions using electrical conductivity and Raman spectroscopy.
研究成果
The study identified two secondary phase transitions at high pressure and room temperature. A positive correlation between dehydration temperature and pressure was established for chalcanthite. The findings contribute to understanding the behavior of hydrous minerals under extreme conditions.
研究不足
The pressure range up to 24.0 GPa may not be sufficient to completely destroy the original crystalline structure of chalcanthite. The study focuses on secondary phase transitions and dehydration, not on complete structural breakdown.
1：Experimental Design and Method Selection:
The study utilized a diamond anvil cell (DAC) for high-pressure and high-temperature experiments. Electrical conductivity and Raman spectroscopy measurements were performed to investigate phase transitions and dehydration.
2：Sample Selection and Data Sources:
Natural chalcanthite samples were collected, cleaned, and ground to powders. X-ray diffraction confirmed the purity of the samples.
3：List of Experimental Equipment and Materials:
Diamond anvil cell, impedance spectrometer (1260, Solartron), Raman spectrometer (Invia, Renishaw), K-type thermocouple, and argon ion laser were used.
4：Experimental Procedures and Operational Workflow:
Samples were compressed up to
5：0 GPa and heated up to 673 K. Raman spectra and electrical conductivity were measured at various pressures and temperatures. Data Analysis Methods:
Raman spectra were analyzed using PeakFit software. Electrical conductivity data were fitted with ZView software to an equivalent circuit.
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