Comment on Raman spectra characterization of boron carbide using first-principles calculations by T. Sahu, A. Bhattacharyya, A. N. Gandi

Editorial Material Materials Science, Multidisciplinary

Comment on Understanding first-order Raman spectra of boron carbides across the homogeneity range

Helmut Werheit

Summary: The Raman spectra of boron carbide provided by Roma et al. are affected by surface excitations due to the inappropriate energy of the laser used in their spectrometer. As a result, the claimed correlation between point defects in the structure and the resonance peaks in their Raman spectra is highly questionable.

PHYSICAL REVIEW MATERIALS (2022)

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Article Physics, Condensed Matter

~Raman spectra characterization of boron carbide using first-principles calculations

Tanay Sahu et al.

Summary: The influence of pressure on the Raman spectra of (B11C)CBCp crystal was studied using first-principles calculations. The results showed that the changes in the spectra were closely related to the polar structure of the crystal and were responsible for the observed activities after amorphization. Studying these changes can provide insights into the relationship between the crystal structure and properties.

PHYSICA B-CONDENSED MATTER (2022)

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Article Chemistry, Inorganic & Nuclear

Electrical conductivity of boron carbide from ∼5 to ∼2100 K in the whole homogeneity range

Helmut Werheit et al.

Summary: This study investigates the electronic properties of B4.3C and finds that the electrical conductivity follows Mott's law of variable-range hopping at low temperatures and is thermally activated at high temperatures, with the activation energy providing information about the energy position of gap states related to the chemical composition.

SOLID STATE SCIENCES (2022)

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Article Instruments & Instrumentation