Effects of catalyst height on diamond crystal morphology under high pressure and high temperature

This paper reports on the development of a magnetically driven high-velocity implosion experiment conducted on the CQ-3 facility, a compact pulsed power generator with a load current of 2.1 MA. The current generates a high Lorentz force between inner and outer liners made from 2024 aluminum. Equally positioned photonic Doppler velocimetry probes record the liner velocities. In experiment CQ3-Shot137, the inner liner imploded with a radial converging velocity of 6.57 km/s while the outer liner expanded at a much lower velocity. One-dimensional magneto-hydrodynamics simulation with proper material models provided curves of velocity versus time that agree well with the experimental measurements. Simulation then shows that the inner liner underwent a shock-less compression to approximately 19 GPa and reached an off-Hugoniot high-pressure state. According to the scaling law that the maximum loading pressure is proportional to the square of the load current amplitude, the results demonstrate that such a compact capacitor bank as CQ-3 has the potential to generate pressure as high as 100 GPa within the inner liner in such an implosion experiment. It is emphasized that the technique described in this paper can be easily replicated at low cost.

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“…The HOM equation of state model 37 and Burgess resistivity model 38 are also used. The constitutive model used is a modified SCG model 39 .…”

Section: Discussion Of Liner Motion and Materials Statesmentioning

confidence: 99%

A compact platform for the investigation of material dynamics in quasi-isentropic compression to ~ 19 GPa

Chen

Cheng

et al. 2021

Sci Rep

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“…So, it can be used as infrared spectral window material, monochromator of x-ray synchrotron radiation, diamond anvil cells (DAC) of high pressure equipment, coal mine drill, etc. [7][8][9][10][11][12] Considering the scarcity of the natural resources and expensive price of perfect type-IIa diamond, study of the synthesis of type-IIa large diamond has practical significance.…”

Section: Introductionmentioning

confidence: 99%

“…Nitrogen getter, which is free in the chamber, can react with nitrogen by generating more stable nitride, so it can avoid the nitrogen entering into the diamond. [4][5][6][7][8][9][10][11][12][13][14][15][16][17] The pre-vious studies on type-IIa large diamond often focused on the nitrogen getter, especially on the commonly used nitrogen getter of Al and Ti/Cu. [6][7][8][9][10][11][12][13][14] Otherwise, catalyst refers to metal or alloy that is able to reduce the synthesis temperature and pressure conditions of diamond synthesis.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7][8][9][10][11][12][13][14][15][16][17] The pre-vious studies on type-IIa large diamond often focused on the nitrogen getter, especially on the commonly used nitrogen getter of Al and Ti/Cu. [6][7][8][9][10][11][12][13][14] Otherwise, catalyst refers to metal or alloy that is able to reduce the synthesis temperature and pressure conditions of diamond synthesis. The influences of different catalysts on N c of synthetic type-Ib large diamond have been reported.…”

Section: Introductionmentioning

confidence: 99%

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Different effect of NiMnCo or FeNiCo on the growth of type-IIa large diamonds with Ti/Cu as nitrogen getter

Li¹,

Zhang

et al. 2017

Chinese Phys. B

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In order to synthesize high-quality type-IIa large diamond, the selection of catalyst is very important, in addition to the nitrogen getter. In this paper, type-IIa large diamonds are grown under high pressure and high temperature (HPHT) by using the temperature gradient method (TGM), with adopting Ti/Cu as the nitrogen getter in Ni 70 Mn 25 Co 5 (abbreviated as NiMnCo) or Fe 55 Ni 29 Co 16 (abbreviated FeNiCo) catalyst. The values of nitrogen concentration (N c ) in both synthesized high-quality diamonds are less than 1 ppm, when Ti/Cu (1.6 wt%) is added in the FeNiCo or Ti/Cu (1.8 wt%) is added in the NiMnCo. The difference in solubility of nitrogen between both catalysts at HPHT is the basic reason for the different effect of Ti/Cu on eliminating nitrogen. The nitrogen-removal efficiency of Ti/Cu in the NiMnCo catalyst is less than in the FeNiCo catalyst. Additionally, a high-quality type-IIa large diamond size of 5.0 mm is obtained by reducing the growth rate and keeping the nitrogen concentration of the diamond to be less than 1 ppm, when Ti/Cu (1.6 wt%) is added in the FeNiCo catalyst.

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“…It is well known that large diamonds exhibit many excellent properties such as extreme hardness, wide-band gap, optical transmission over a wide range, high thermal conductivity, good electrical insulation, and so on. [1][2][3][4][5][6][7][8][9] Effective doping can modify some of these properties. [10][11][12][13][14] Attempts have been made to dope diamond films using various elements.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of N-type semiconductor diamonds with sulfur, boron co-doping in FeNiMnCo-C system at high pressure and high temperature

Zhang

et al. 2017

Chinese Phys. B

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A series of diamonds with boron and sulfur co-doping were synthesized in the FeNiMnCo-C system by temperature gradient growth (TGG) under high pressure and high temperature (HPHT). Because of differences in additives, the resulting diamond crystals were colorless, blue-black, or yellow. Their morphologies were slab, tower, or minaret-like. Analysis of the x-ray photoelectron spectra (XPS) of these diamonds shows the presence of B, S, and N in samples from which N was not eliminated. But only the B dopant was assuredly incorporated in the samples from which N was eliminated. Resistivity and Hall mobility were 8.510 Ω•cm and 760.870 cm 2 /V•s, respectively, for a P-type diamond sample from which nitrogen was eliminated. Correspondingly, resistivity and Hall mobility were 4.211×10 5 Ω•cm and 76.300 cm 2 /V•s for an N-type diamond sample from which nitrogen was not eliminated. Large N-type diamonds of type Ib with B-S doping were acquired.

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Effects of catalyst height on diamond crystal morphology under high pressure and high temperature

Cited by 5 publications

References 24 publications

A compact platform for the investigation of material dynamics in quasi-isentropic compression to ~ 19 GPa

A compact platform for the investigation of material dynamics in quasi-isentropic compression to ~ 19 GPa

Different effect of NiMnCo or FeNiCo on the growth of type-IIa large diamonds with Ti/Cu as nitrogen getter

Synthesis of N-type semiconductor diamonds with sulfur, boron co-doping in FeNiMnCo-C system at high pressure and high temperature

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