Single crystal diamond particles formed by the reaction of carbon black and solid alcohol under high-pressure and high-temperature

Oshima, Ryuji; Iizuka, Kanji; Vul, A. Ya.; Shakhov, F. M.

doi:10.1016/j.jcrysgro.2022.126646

Cited by 5 publications

(5 citation statements)

References 36 publications

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“…This heat-resistant precursor retaining heavy atoms can serve as a precursor for doping diamonds in the HPHT process. To intensify this process, we have combined the precursor with a hydrocarbon substance (pentaerythritol), which revealed the catalytic properties in the synthesis of diamonds from carbon clusters of 40 nm in size [ 21 ]. We have saturated the pyrolyzate with pentaerythritol ( Figure 6 ) which penetrates into fine pores of the carbon matrix where the interaction of molecules with Eu atoms is made possible by their release from the carbon material during HPHT.…”

Section: Resultsmentioning

confidence: 99%

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X-ray Excited Optical Luminescence of Eu in Diamond Crystals Synthesized at High Pressure High Temperature

et al. 2023

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Powder diamonds with integrated europium atoms were synthesized at high pressure (7.7 GPa) and temperature (1800 °C) from a mixture of pentaerythritol with pyrolyzate of diphthalocyanine (C64H32N16Eu) being a special precursor. In diamonds prepared by X-ray fluorescence spectroscopy, we have found a concentration of Eu atoms of 51 ± 5 ppm that is by two orders of magnitude greater than that in natural and synthetic diamonds. X-ray diffraction, SEM, X-ray exited optical luminescence, and Raman and IR spectroscopy have confirmed the formation of high-quality diamond monocrystals containing Eu and a substantial amount of nitrogen (~500 ppm). Numerical simulation has allowed us to determine the energy cost of 5.8 eV needed for the incorporation of a single Eu atom with adjacent vacancy into growing diamond crystal (528 carbons).

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Section: Resultsmentioning

confidence: 99%

“…To produce Eu-doped diamonds, we applied the HPHT method optimized in the synthesis of microdiamond powders from different carbon precursors such as detonation nanodiamond [ 19 ], shock-wave polycrystalline diamonds [ 20 ], and carbon black [ 21 ] together with pentaerythritol or ethanol as the hydrocarbon sources.…”

Section: Methodsmentioning

confidence: 99%

X-ray Excited Optical Luminescence of Eu in Diamond Crystals Synthesized at High Pressure High Temperature

et al. 2023

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“…For the synthesis of Eu-doped diamonds, we used the HPHT method optimized in the synthesis of microdiamond powders from different carbon precursors such as detonation nanodiamond [14], shock-wave polycrystalline diamonds [15] and carbon black [16] together with pentaerythritol or ethanol as the hydrocarbon sources.…”

Section: Synthesis and Purificationmentioning

confidence: 99%

“…Such a heat-resistant precursor, which strongly retains heavy atoms, can serve as a favorable precursor for doping diamonds in the HPHT process. To intensify this process, we combined this precursor with a hydrocarbon substance (pentaerythritol), which has the catalytic properties found earlier in the synthesis of diamonds from carbon clusters of 40 nm in size [16]. We decided to saturate the pyrolyzate with pentaerythritol (Figure 6), which penetrates into the fine pores of the carbon matrix, where interaction with Eu atoms is possible by their release from the carbon frameworks during HPHT.…”

Section: Structure Of Pyrolyzatementioning

confidence: 99%

X-ray Exited Optical Luminescence of Eu in Diamond Crystals Synthesized at High-pressure High-temperature

Лебедев¹,

Shakhov²,

Vul³

et al. 2022

Preprint

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Diamond powders with inclusions of europium atoms were synthesized at high pressure (7.7 GPa) and temperature (1800oC) from a mixture of pentaerythritol, C(CH2OH)4, and pyrolyzate of diphthalocyanine (C64H32N16Eu) served as a special precursor. In prepared diamonds by X-ray fluorescence spectroscopy, we have found the concentration of Eu atoms of 51±5 ppm that is by two orders of magnitude greater than that in known natural and synthetic diamonds. X-ray diffraction, SEM, X-ray exited optical luminescence, Raman and IR spectroscopy have confirmed the formation of diamond monocrystals of high quality with em-bedded Eu atoms and a nitrogen content of ~500 ppm. Numerical simulation has allowed us de-termine the energy cost of 5.8 eV needed for the incorporation of a single Eu atom with adjacent vacancy into growing diamond crystal (528 carbons).

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“…DLC films have an amorphous structure and consist of sp 3 and sp 2 bonded carbon atoms. Also, small amounts of sp 1 bonding is possible under certain coating conditions, but sp 2 and sp 3 bonds are predominant [7][8][9][10][11]. High proportion of sp 2 bonding results in a relatively soft and more graphite like structure, while more sp 3 bonding produces a hard, diamond-like structure [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Wear Behavior of W-DLC Films Deposited on Si Substrates

Karslioglu,

Meletis

2023

JNanoR

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Tungsten (W) reinforced diamond-like carbon (DLC) nanocomposite thin films were deposited on silicon substrates by magnetron sputtering in a CH4/Ar discharge. The W content of the films was varied by varying the W target power (20, 40, 60, 80, and 100 W). The evolution of the W-DLC nanocomposites was studied by high-resolution transmission electron microscopy, X-ray energy dispersive spectroscopy, X-ray photoelectron spectroscopy, 3D optical profilometry and Raman spectroscopy. Increasing the W target power resulted in an almost liner increase in the W content, reduced the hardness and the sp3/sp2 ratio in the films, while it increased the surface roughness and promoted formation of WC nanoparticles. Tribological properties were studied by conducting sliding reciprocating testing. Wear tracks were analyzed with Raman spectroscopy and 3D optical profilometry. Increasing the W content in the films (increasing target power) resulted in a reduction of both, the friction coefficient and wear rate. The film deposited at 80 W target power (~8 at. % W) exhibited the lowest friction coefficient (0.15) and wear rate (6x10-7 mm3N-1m-1). The observed low friction and wear rate were attributed to the particular nanocomposite structure of the films involving a fine distribution of WC nanoparticles surrounded by a sp2 dominant carbon network. The present W-DLC nanocomposite films offer a highly desirable combination of low friction and low wear rate.

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Single crystal diamond particles formed by the reaction of carbon black and solid alcohol under high-pressure and high-temperature

Cited by 5 publications

References 36 publications

X-ray Excited Optical Luminescence of Eu in Diamond Crystals Synthesized at High Pressure High Temperature

X-ray Excited Optical Luminescence of Eu in Diamond Crystals Synthesized at High Pressure High Temperature

X-ray Exited Optical Luminescence of Eu in Diamond Crystals Synthesized at High-pressure High-temperature

Synthesis, Characterization, and Wear Behavior of W-DLC Films Deposited on Si Substrates

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