Phases formed during rapid quenching of liquid carbon

Basharin, A. Yu.; Dozhdikov, V. S.; Дубинчук, В. Т.; Kirillin, A. V.; Lysenko, I. Yu.; Turchaninov, M. A.

doi:10.1134/s1063785009050137

Cited by 20 publications

(14 citation statements)

References 6 publications

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“…The undercooling was also found to be orientation and regrowth velocity dependent: ∼5 K/m s on (100)Ge and ∼20 K/m s on (111)Ge. 23,24 Basharin et al 16 have estimated the temperature dependence of Gibbs free energy of graphite, metastable liquid carbon and diamond at a low pressure of 120 MPa of helium and found that free energy of liquid carbon can be equal to that of diamond at 4160 ± 50 K, which is considerably lower than melting point of liquid graphite, at a pressure of 120 MPa of helium. Thus, it is possible that diamond can be nucleated from super undercooled state at 4160 K. However, Basharin et al 17 tried to quench diamond using 1-ms pulsed laser melting (wavelength of λ = 1.06 µm and a power of 10 kW) of HOPG graphite with limited success due to lower undercooling with 1 ms lasers on a crystalline graphite substrate.…”

Section: -21mentioning

confidence: 99%

“…No Raman spectra were reported from these experiments perhaps due to very small amount of diamond phase. 16,17 It should be pointed out that undercooling with 1-ms pulses of Nd:YAG on HOPG substrates is expected to be even smaller than nanosecond laser pulses.…”

Section: Gementioning

confidence: 99%

“…Thus, it is possible that diamond can be nucleated from super undercooled state at 4160 K. However, Basharin et al 17 tried to quench diamond using 1-ms pulsed laser melting (wavelength of λ = 1.06 µm and a power of 10 kW) of HOPG graphite with limited success due to lower undercooling with 1 ms lasers on a crystalline graphite substrate. 16,17 Bonding and structure of liquid carbon have been studied using time-resolved x-ray absorption spectroscopy 25 and results compared with first-principles molecular dynamics simulations. 26 These results suggest that local bonding structure of the liquid can be varied from a mixture of twofold and threefold coordinated atoms at low density (1.27 g cm −3 ) to fourfold coordinated atoms at high density (3.02 g cm −3 ).…”

Section: -21mentioning

confidence: 99%

See 2 more Smart Citations

Research Update: Direct conversion of amorphous carbon into diamond at ambient pressures and temperatures in air

Narayan

Bhaumik

2015

APL Materials

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We report on fundamental discovery of conversion of amorphous carbon into diamond by irradiating amorphous carbon films with nanosecond lasers at room-temperature in air at atmospheric pressure. We can create diamond in the form of nanodiamond (size range <100 nm) and microdiamond (>100 nm). Nanosecond laser pulses are used to melt amorphous diamondlike carbon and create a highly undercooled state, from which various forms of diamond can be formed upon cooling. The quenching from the super undercooled state results in nucleation of nanodiamond. It is found that microdiamonds grow out of highly undercooled state of carbon, with nanodiamond acting as seed crystals.

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Section: -21mentioning

confidence: 99%

Section: Gementioning

confidence: 99%

Section: -21mentioning

confidence: 99%

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Research Update: Direct conversion of amorphous carbon into diamond at ambient pressures and temperatures in air

Narayan

Bhaumik

2015

APL Materials

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“…The microphone and photo acoustic spectrum test system usually adopts the piezoelectric element (PZT) or uses microphone (MIC) [10]. PZT has the problem of electric charge [11], which would affect the sensitivity of system testing. The frequency range for the MIC is quite limited and is affected easily by noise, as we all know that the PAS technology has heating effect.…”

Section: Introductionmentioning

confidence: 99%

Material measurement method based on femtosecond laser plasma shock wave

Dong

2016

Photonic Sens

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Abstract:The acoustic emission signal of laser plasma shock wave, which comes into being when femtosecond laser ablates pure Cu, Fe, and Al target material, has been detected by using the fiber Fabry-Perot (F-P) acoustic emission sensing probe. The spectrum characters of the acoustic emission signals for three kinds of materials have been analyzed and studied by using Fourier transform. The results show that the frequencies of the acoustic emission signals detected from the three kinds of materials are different. Meanwhile, the frequencies are almost identical for the same materials under different ablation energies and detection ranges. Certainly, the amplitudes of the spectral character of the three materials show a fixed pattern. The experimental results and methods suggest a potential application of the plasma shock wave on-line measurement based on the femtosecond laser ablating target by using the fiber F-P acoustic emission sensor probe.

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“…Small diamond structures were found following irradiation of ms laser pulses in a high-pressure He atmosphere. 29 The Raman peaks observed in Ref. 29 had a significantly larger width (FWHM ¼ 60 cm…”

mentioning

confidence: 99%

Transforming graphite to nanoscale diamonds by a femtosecond laser pulse

Nüske

Jurgilaitis

Enquist

et al. 2012

Applied Physics Letters

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Formation of cubic diamond from graphite following irradiation by a single, intense, ultra-short laser pulse has been observed. Highly oriented pyrolytic graphite (HOPG) samples were irradiated by a 100 fs pulse with a center wavelength of 800 nm. Following laser exposure, the HOPG samples were studied using Raman spectroscopy of the sample surface. In the laser-irradiated areas, nanoscale cubic diamond crystals have been formed. The exposed areas were also studied using grazing incidence x-ray powder diffraction showing a restacking of planes from hexagonal graphite to rhombohedral graphite.

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Phases formed during rapid quenching of liquid carbon

Cited by 20 publications

References 6 publications

Research Update: Direct conversion of amorphous carbon into diamond at ambient pressures and temperatures in air

Research Update: Direct conversion of amorphous carbon into diamond at ambient pressures and temperatures in air

Material measurement method based on femtosecond laser plasma shock wave

Transforming graphite to nanoscale diamonds by a femtosecond laser pulse

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