Strength of Diamond

Weidner, Donald J.; Wang, Yanbin; Vaughan, Michael T.

doi:10.1126/science.266.5184.419

Cited by 136 publications

(71 citation statements)

References 14 publications

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“…The diffraction-line broadening has been used to determine the maximum stress in the stress distribution in the crystallites. [2][3][4][5][6][7][8][9][10][11][12] The maximum stress p max (ffi eY, where e and Y are the micro-strain and the aggregate Young's modulus, respectively) is often termed the micro-differential stress (micro-DS) and is taken as the measure of compressive strength of the polycrystalline sample material. Some studies used p max (e.g., Refs.…”

Section: Introductionmentioning

confidence: 99%

Strength of polycrystalline niobium from high-pressure x-ray diffraction data: A comparison of results from line-width and line-shift analyses

Singh

Liermann

2015

Journal of Applied Physics

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High purity polycrystalline niobium was compressed in a diamond anvil cell (DAC) without any pressure transmitting medium and the pressure was increased in steps of ∼5 GPa to the highest pressure of ∼40 GPa. The diffraction pattern was recorded after each pressure increment using angle-dispersive mode with the conventional diffraction geometry, wherein the primary x-ray beam is parallel to the load axis of the DAC. The strength of niobium as function of pressure was determined using the line-width and line-shift analyses. Both eY and 2eY, where Y is the aggregate Young's modulus and e is the strain determined from the line-width analysis, have been used as the measure of strength in earlier studies. In this study, it is eY that agrees with the strength determined from the line-shift analysis of the radial diffraction data as well as the data from the conventional diffraction geometry. These results have been discussed and compared with a similar observation made earlier on strength of diamond. This study highlights the ambiguity that presently exists in choosing eY or 2eY as a measure of strength while attempting to estimate the strength from the diffraction line width analysis.

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Section: Introductionmentioning

confidence: 99%

Strength of polycrystalline niobium from high-pressure x-ray diffraction data: A comparison of results from line-width and line-shift analyses

Singh

Liermann

2015

Journal of Applied Physics

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“…6͑d͒. The value of the impact pressure is of the same order as the strength of diamonds, 31 larger than the strength of many known materials. This demonstrates that CNT and graphene sheet can be used as a nanoknife and nanocutting board to cut materials.…”

Section: B Momentum and Impact Pressurementioning

confidence: 61%

Collision of a suddenly released bent carbon nanotube with a circular graphene sheet

Duan

Wang

Tang

2010

Journal of Applied Physics

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Molecular dynamics ͑MD͒ simulations were used to investigate the mechanical strain energy release of a bent single wall carbon nanotube ͑CNT͒ and its mechanical collision with a circular graphene sheet that is fixed at its edges. The MD simulations show that the CNT is able to store a vast amount of mechanical strain energy because of the formation of kinks on its wall at the regions of maximum curvature. The sudden release of the strain energy upon releasing the bent CNT can cause its tip to approach a speed of 7000 m/s. Even with such a high speed collision with a monolayer graphene sheet, the CNT and the monolayer graphene sheet remain completely intact and do not suffer any damage. The instantaneous average impact pressure between the CNT and the graphene sheet is calculated to be in the range of 1-10 GPa for different temperatures and aspect ratios of the CNT. These results indicate the promising application of a CNT and a graphene sheet as a nanoknife and a nanocutting board, respectively, for nanocleavage processes such as sequence-specific DNA cleaving processes.

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“…Deviatoric stress is well known to be much more severe in cold samples than in annealed or hot samples (7). It is possible, however, that some stress can be built up on T quenching, as illustrated by the slight broadening of the Al 2 O 3 diffraction peaks on the top spectrum of figure 2 of (1).…”

Section: Methodsmentioning

confidence: 96%