研究目的
To characterize natural mixtures of ramsdellite and groutellite by combining SEM-EDS, XRPD, FT-IR and Raman spectroscopy, to provide reference Raman spectra and investigate their laser-induced degradation.
研究成果
The study provided reference Raman spectra for groutellite and ramsdellite and characterized their laser-induced degradation. It showed that Raman spectroscopy can be a powerful tool for monitoring the electrochemical processes in cathode materials at a very fine scale.
研究不足
The high sensitivity of manganese oxides to the laser beam may lead to sample degradation during Raman analysis, potentially causing misleading identification of the sample.
1：Experimental Design and Method Selection:
The study combined SEM-EDS, XRPD, FT-IR, and Raman spectroscopy to characterize natural mixtures of ramsdellite and groutellite. The methodology included heating experiments to study the transformation of groutellite into ramsdellite and further degradation products.
2：Sample Selection and Data Sources:
Samples from the Calabona Mine and Chiaramonti (Sardinia, Italy) were used. They were characterized by optical microscopy, SEM-EDS, XRPD, and FT-IR before Raman analysis.
3：List of Experimental Equipment and Materials:
SEM analyses were performed using a Zeiss Sigma 300 FE-SEM. XRPD data were collected using a Bruker AXS D8 Advance. FTIR spectra were collected using a Nicolet iS50 FTIR spectrometer. Raman measurements were performed using an inVia Renishaw Raman spectrometer.
4：Experimental Procedures and Operational Workflow:
Samples were prepared for SEM-EDS, XRPD, and FT-IR analyses. Raman spectra were collected at different laser powers to study the laser-induced degradation of the samples.
5：Data Analysis Methods:
The spectra acquisition and data analyses were accomplished using WiRE? and Origin software. The peak positions are estimated to be accurate to at least ±2 cm?1.
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