研究目的
Investigating the phase behavior and vibrational properties of normal butane and isobutane under high pressures up to 40 GPa using Raman spectroscopy.
研究成果
The study identified phase transitions in normal butane at 1.9(5) GPa and 2.9(5) GPa, and in isobutane at 2.7(5) GPa and 3.5(5) GPa. These transitions were characterized by changes in Raman spectra, including the splitting of modes and appearance/disappearance of peaks. The results highlight the complex high-pressure behavior of butane isomers.
研究不足
The study is limited to ambient temperatures and pressures up to 40 GPa. The interpretation of solid butane’s spectra could be challenging due to weaker lines and scattering background.
1：Experimental Design and Method Selection:
Raman spectroscopy was used to study the phase behavior of butane isomers under high pressure. The DAC technique was employed to achieve pressures up to 40 GPa.
2：Sample Selection and Data Sources:
n-Butane and isobutane, both
3：95% pure, were used without additional puri?cation. List of Experimental Equipment and Materials:
Symmetric BX-90-type diamond anvil cells (DAC) equipped with synthetic, CVD-type IIa diamonds, a rhenium gasket, and a He-Ne laser (
4：8 nm excitation) for Raman spectra acquisition. Experimental Procedures and Operational Workflow:
6 Butanes were cryogenically loaded in DACs. Raman spectra were collected for both compression and decompression experiments. Pressure was determined using the shift in the ruby luminescence line.
5：Data Analysis Methods:
Raman spectra were analyzed for changes in vibrational modes indicative of phase transitions.
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