Optical properties of amorphous boron
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Cited by (39)
Densification of amorphous boron under pressure
2017, Journal of Non-Crystalline SolidsCitation Excerpt :a-B is known as a semiconductor. The experimental band gap energy was reported to be in the range from 0.51 eV to 1.0 eV [39–42]. At zero pressure, the HOMO-LUMO band gap is estimated to be 0.27 eV in the present DFT-GGA study.
Hybrid CO2 laser waterjet heat (LWH) treatment of bindered boron nitride composites with hardness improvement
2017, Ceramics InternationalCitation Excerpt :With these ideas, the search of new superhard materials can be focused on the range of synthesized materials composed of light elements. According to the ideas discussed above, some hard materials can be selected as potential superhard materials including cBN [6], wurtzite boron nitride (wBN) [7], boron carbide (B4C) [8,9], Titanium Diboride (TiB2) [10,11], etc. Table 1 shows the Knoop hardness, thermal stability, and chemical stability of those hard materials.
Ultrahard boron nitride material through a hybrid laser/waterjet based surface treatment
2016, Acta MaterialiaCitation Excerpt :In addition, an unidentified hump-like peak around 1205 cm−1 is also observed. This hump-like peak can be assigned to amorphous boron (B12) or a rich boron phase of BN [30,31] which may correspond to the solid interlayers observed at the grain boundaries in the HRSEM images. Due to the high reactivity of amorphous boron to oxygen, we expect that boron-rich phase of BN are more likely to be present along the boundaries of BN particles.
Electroextraction of boron from boron carbide scrap
2013, Materials CharacterizationCitation Excerpt :The temperature and duration of electrolysis employed in the present study are not sufficient for the growth of the crystals during electrolysis. Kuhlmann et al. [18] studied the x-ray diffraction of the amorphous boron samples derived from different origin. These authors reported that traces of crystalline β-rhombohedral boron phase (less than 5–6 wt.
Laser/waterjet heat treatment of polycrystalline cubic/wurtzite boron nitride composite for reaching hardness of polycrystalline diamond
2012, Materials LettersCitation Excerpt :Broadening of peaks in the heat treated condition is probably caused by the compressive residual stresses. The peak with a hump around 1180–1200 cm−1 is assigned to amorphous boron (B12) [15,16]. In the heat treated sample, the ratio of peaks corresponding to 1052 cm−1 (cBN) and 1040 cm−1 (wBN) becomes larger suggesting the partial transformation of wBN to cBN.