Boron carbide structure by Raman spectroscopy

Atomic Structure and Vibrational Properties of IcosahedralB4CBoron Carbide

“…This leads to a degradation of the reflectivity spectrum with respect to the ideal (mono-crystalline) case, and the largest experimental error is expected at the LO minima. In order to further confirm the polar configuration as the dominant one in B 4 C, we now compare the Raman spectrum measured on a single crystal [17] with the predictions of our calculations (Fig. 3).…”

“…Unfortunately, a complete quantitative comparison is difficult due to mode broadening, especially at high frequency. However, two modes at 481 and 534 cm −1 are rather sharp [17], and they are properly accounted for only by the polar model, which predicts two peaks respectively at 498 and 543 cm −1 . The former is a rotation of the chain about an axis perpendicular to the [111] direction and the later is the librational mode of the icosahedron previously identified in α-boron [12].…”

Electronic structures and mechanical properties of boron and boron-rich crystals (Part I)

“…[149]). The linewidth is even less than the resolution limit of the conventional Raman spectroscopy [80,148]. Model calculations were unable to describe this frequency [137,144,145].…”

“…The exception is the so-called ghost peak at 527 cm −1 appearing in the Raman spectrum [147,148]. This band exhibits a very narrow linewidth; see Fig.…”

The incorporation of Nickel and Phosphorus dopants into Boron-Carbon alloy thin films

“…Like crystalline boron carbide, the boroncarbon alloys consist of an icosahedral network [1,8], where the icosahedra are composed of boron and carbon atoms. In contrast, the icosahedra in crystalline boron carbide, are almost exclusively constructed from boron atoms with the carbon atoms predominantly participating in the three atom chains that connect the icosahedral network [9][10][11][12][13][14][15][16]. The average crystallite size of the PECVD-grown alloys is approximately 100 Å [1,8].…”