The relationship between high-pressure phase transition of boron carbide and Raman spectroscopy evolution
Phase transition law of boron carbide under high pressure
Under high pressure, the phase transition law of boron carbide is quite complicated. According to research, the phase transition of boron carbide under high pressure covers the phase transition from α-B4C to β-B4C, the phase transition from β-B4C to γ-B4C, and the decomposition of γ-B4C into B2O3 and C.
If boron carbide is affected by high pressure, α-BxC will become β-BxC. If the pressure continues to increase, β-BxC will become γ-BxC. When the pressure reaches a certain value, γ-BxC will decompose into B?O? and C.
In this process, the crystal structure and Raman spectral characteristics of B2O3 and C are different from those of γ-B4C.
What impact will the high-pressure phase transition of boron carbide have on Raman spectroscopy?
Raman spectroscopy is a particularly important method for characterizing the properties of materials. In the study of boron carbide, Raman spectroscopy is widely used to explore its structure and phase transition process. According to research, different phases of boron carbide have different Raman spectral characteristics.
If boron carbide undergoes a phase transition, its Raman spectrum will also change. For example, in the phase transition between α-B4C and β-B4C, the Raman spectrum of α-B4C has a strong peak at about 1290 cm^-1, but when it comes to β-B4C, this peak moves to about 1375 cm^-1.
Raman spectra change with phase transition of boron carbide
That is because the structure of β-B4C is more compact than that of α-B4C, so the frequency of its atomic vibration will also change.
Similarly, when the phase transition occurs from β-B4C to γ-B4C, the characteristics of the Raman spectrum will change. There is a strong peak in β-B4C at about 1335 cm^-1, but in γ-B4C, this peak disappears.
This is because the structure of γ-B4C is different from that of β-B4C, so the frequency of its atomic vibration will also change.
In addition, after boron carbide is decomposed into B2O3 and C, their Raman spectra have different characteristics. For example, in B2O3, there is a strong peak at about 810 cm^-1, and in C, there is a strong peak at about 1500 cm^-1.
The relationship between the high-pressure phase transition of boron carbide and the evolution of the Raman spectrum
This analysis shows that different phases of boron carbide have different crystal structures and atomic vibration frequencies, so their Raman spectrum characteristics are also different.
When boron carbide undergoes phase transition, its Raman spectrum will change due to the change in structure.
At the same time, Raman spectroscopy can be used to explore the phase transition process of boron carbide. For example, by monitoring the changes in pressure caused by a specific Raman spectral peak, the pressure limit of the phase transition can be determined. This method is called a Raman spectroscopy pressure sensor.
In addition, Raman spectroscopy can be used to explore the phase transition kinetics of boron carbide. By real-time monitoring of Raman spectra, dynamic information such as phase transition rate and phase transition path can be studied.
This information plays an important role in understanding the phase transition mechanism of boron carbide and improving its performance.
The relationship between the high-pressure phase transition of boron carbide and the evolution of the Raman spectrum
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