Change of dislocations density in single crystals of various types diamonds depending on the growth temperature and rate

Suprun, O. M.

doi:10.15407/fm23.04.378

Cited by 3 publications

(1 citation statement)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As is known, type-Ib diamonds contain nitrogen in the amount of ~10 19 cm -3 in the form of C-centers. The density of the dislocations was determined by the selective etching and was about 1.3 × 10 6 cm −2 [24]. cBN single crystals were synthesized in a belt-type HPA using high-pressure cells at NIMS, Tsukuba, Japan.…”

Section: Methodsmentioning

confidence: 99%

Vickers Hardness of Diamond and cBN Single Crystals: AFM Approach

et al. 2017

View full text Add to dashboard Cite

Atomic force microscopy in different operation modes (topography, derivative topography, and phase contrast) was used to obtain 3D images of Vickers indents on the surface of diamond and cBN single crystals with high spatial resolution. Confocal Raman spectroscopy and Kelvin probe force microscopy were used to study the structure of the material in the indents. It was found that Vickers indents in diamond has no sharp and clear borders. However, the phase contrast operation mode of the AFM reveals a new viscoelastic phase in the indent in diamond. Raman spectroscopy and Kelvin probe force microscopy revealed that the new phase in the indent is disordered graphite, which was formed due to the pressure-induced phase transformation in the diamond during the hardness test. The projected contact area of the graphite layer in the indent allows us to measure the Vickers hardness of type-Ib synthetic diamond. In contrast to diamond, very high plasticity was observed for 0.5 N load indents on the (001) cBN single crystal face. Radial and ring cracks were absent, the shape of the indents was close to a square, and there were linear details in the indent, which looked like slip lines. The Vickers hardness of the (111) synthetic diamond and (111) and (001) cBN single crystals were determined using the AFM images and with account for the elastic deformation of the diamond Vickers indenter during the tests.

show abstract

Section: Methodsmentioning

confidence: 99%