Diamond growth and characteristics in the metal-silicate-H2O-C system at HPHT conditions

Lu, Zhiyun; Zhao, Hongyu; Wang, Yongkui; Fang, Shuai; Cai, Zhenghao; Wang, Zhiwen; Ma, Hongan; Chen, Liangchao; Jia, Hongsheng; Jia, Xiaopeng

doi:10.1016/j.lithos.2021.106470

Cited by 8 publications

(7 citation statements)

References 59 publications

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“…61 Previous works have shown that the diamond crystals grown in the metal−silicate−C system do not show the {100} growth spirals. 63,76 Therefore, we speculate that the higher content of C−H bond, C−O bond, and liquid water molecules on {100} faces than {100} faces may be the cause of {100} growth spirals.…”

Section: Resultsmentioning

confidence: 99%

“…Our previous work has confirmed that the addition of silicate has no obvious effects on the decreased N total and evolved morphology of diamonds. 30,63 Therefore, H 2 O is speculated to account for these crystal characteristics. We think that the formation of −CH 3 , −CH 2 , and R1−CH(R2)−OH groups terminates the extension of the three-dimensional network structure of the C−C bond, resulting in the reduction of crystal growth rate.…”

Section: Resultsmentioning

confidence: 99%

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Orientational Dependences of Diamonds Grown in the NiMnCo–Silicate–H₂O–C System under HPHT Conditions and Implications to Natural Diamonds

Wang

et al. 2022

ACS Earth Space Chem.

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The detailed phase compositions in the NiMnCo–C system with Mg2Si3O8·5H2O added and its effects on {111} and {100} diamonds grown at 5.5 GPa and 1355 °C are reported. The results reveal that Mg2Si3O8·5H2O reacts with catalysts and produces tephroite, forsterite, coesite, and H2O. With its content in the carbon source increasing from 0.0 to 5.0 wt %, the morphology of diamonds evolves from a bulky cubic octahedron/truncated cube to a {111}/{100}skeleton with {110} dendrites and finally to {100} antiskeletal dendrites. The concentration of nitrogen impurity (N total) in diamonds exhibits a N total{111} > N total{100} pattern and decreases from ∼117 and ∼100 to ∼36 and ∼21 ppm, respectively. Except liquid water inclusion, hydrogen and oxygen are also found to enter the surfaces, grain boundaries, inclusions, or cracks of the growing diamond in the form of −CH3, −CH2, and R1–CH(R2)–OH groups and compete with nitrogen atoms entering the diamond lattice, thus resulting in the decreased N total. Besides, the termination of diamond structure by C–H and C–OH bonds is also controlled by the oriented density of step edge and causes hydrocarbon group content C {100} > C {111} and crystal growth rate V {100} > V {111}. The competition mechanism and the oriented density of step edge may be used to constrain the formation environment and interpret the lower nitrogen content in natural cubic and fibrous diamonds than in octahedral diamonds.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Orientational Dependences of Diamonds Grown in the NiMnCo–Silicate–H₂O–C System under HPHT Conditions and Implications to Natural Diamonds

Wang

et al. 2022

ACS Earth Space Chem.

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“…The nitrogen impurity content in the C center of the diamond was determined by utilizing the relationship between the infrared absorption coefficient and the nitrogen impurity content. The calculation method for nitrogen content is as follows: − …”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Fe–C–Si System Ib-Type Gem-Grade Diamond Single Crystals under High Temperature and Pressure

Liu,

Wang,

et al. 2023

Crystal Growth & Design

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“…Also, under high-pressure and -temperature conditions, diamond growth is possible in laboratories. 1 As another example, the phases of hydrogen 2 under high pressure have always been a hot topic, where the related experiments highlight the importance of the pressure on phase transition. There are many other examples of pressure-induced phase transitions reported experimentally 3,4 and predicted theoretically.…”

Section: Introductionmentioning

confidence: 99%

“…There are many examples, like the formation of diamonds directly resulting from high-pressure and -temperature conditions. Also, under high-pressure and -temperature conditions, diamond growth is possible in laboratories . As another example, the phases of hydrogen under high pressure have always been a hot topic, where the related experiments highlight the importance of the pressure on phase transition.…”

Section: Introductionmentioning

confidence: 99%

First-Principles Prediction of High-Pressure Phase and Thermoelectric Transport in SrAgP

Chaudhary,

Dhawan,

Maitra

et al. 2023

J. Phys. Chem. C

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Designing new materials for waste heat to electricity conversion is crucial in energy science. Herein, we have predicted a high-pressure phase of SrAgP, realized above 11 GPa pressure, for thermoelectric applications. Density functional theory (DFT) and hybrid functional (HSE06) are used for a better understanding of the electronic structure and transport properties of the high-pressure phase of SrAgP. A nodal line semimetal (NLSM) phase is observed in DFT calculations, which transform into a trivial band gap phase on using HSE06 hybrid DFT functional. In thermoelectric transport, the maximum value of the dimensionless figure of merit (zT ∼ 0.65) of high-pressure SrAgP is obtained at 800 K in the p-type region. The exciting feature in transport properties is the closely matching zT (∼0.40) values between n-type and p-type regions at 800 K, making high-pressure SrAgP interesting for device-based applications.

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Diamond growth and characteristics in the metal-silicate-H2O-C system at HPHT conditions

Cited by 8 publications

References 59 publications

Orientational Dependences of Diamonds Grown in the NiMnCo–Silicate–H₂O–C System under HPHT Conditions and Implications to Natural Diamonds

Orientational Dependences of Diamonds Grown in the NiMnCo–Silicate–H₂O–C System under HPHT Conditions and Implications to Natural Diamonds

Synthesis and Characterization of Fe–C–Si System Ib-Type Gem-Grade Diamond Single Crystals under High Temperature and Pressure

First-Principles Prediction of High-Pressure Phase and Thermoelectric Transport in SrAgP

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Diamond growth and characteristics in the metal-silicate-H2O-C system at HPHT conditions

Cited by 8 publications

References 59 publications

Orientational Dependences of Diamonds Grown in the NiMnCo–Silicate–H2O–C System under HPHT Conditions and Implications to Natural Diamonds

Orientational Dependences of Diamonds Grown in the NiMnCo–Silicate–H2O–C System under HPHT Conditions and Implications to Natural Diamonds

Synthesis and Characterization of Fe–C–Si System Ib-Type Gem-Grade Diamond Single Crystals under High Temperature and Pressure

First-Principles Prediction of High-Pressure Phase and Thermoelectric Transport in SrAgP

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Product

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Orientational Dependences of Diamonds Grown in the NiMnCo–Silicate–H₂O–C System under HPHT Conditions and Implications to Natural Diamonds

Orientational Dependences of Diamonds Grown in the NiMnCo–Silicate–H₂O–C System under HPHT Conditions and Implications to Natural Diamonds