研究目的
Investigating the performance of 4H-SiC as an anvil material for high-pressure spectroscopic measurements compared to diamond.
研究成果
4H-SiC anvils show superior performance in high-pressure spectroscopic studies compared to diamond, especially in regions where diamond's Raman and IR characteristics interfere with measurements. The study extends the absorption boundary from 420 nm (diamond) to 370 nm (4H-SiC), enabling broader applications in UV-visible absorption spectroscopy.
研究不足
The absorption boundary of 4H-SiC at 370 nm limits the measurable region in UV-visible absorption spectroscopy. The study is focused on the comparison between 4H-SiC and diamond anvils, and may not cover all potential applications or materials.
1：Experimental Design and Method Selection:
The study involved Raman scattering, IR absorption, and UV-visible absorption spectroscopy to compare the performance of 4H-SiC and diamond anvils under high pressure.
2：Sample Selection and Data Sources:
Single crystal 4H-SiC was commercially purchased and prepared into anvils. CdI2 was used for UV-visible absorption studies.
3：List of Experimental Equipment and Materials:
Micro-Raman system with a 532 nm laser, Bruker VERTEX 70v FTIR spectrometer, custom-built IR microscope with type IIa diamonds, and 4H-SiC anvil cells.
4：Experimental Procedures and Operational Workflow:
Raman and IR spectra were collected under the same experimental conditions. UV-visible absorption spectroscopy was performed on CdI2 under increasing pressure.
5：Data Analysis Methods:
The band gap of CdI2 was estimated by extrapolating the linear portion of the (αhν)1/2 versus the hv curve in the indirect band-gap Tauc plots under different pressures.
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