HPHT Growth and IR Characterizaton of Large Diamond Crystals in FeNi-C-FeS Systems

By temperature gradient method (TGM), with Invar alloy as solvent catalyst, FeS and boron as additives, large diamond crystals are grown under high pressure and high temperature (HPHT) of about 5.4GPa and 1550K. With the content of FeS increased, the colors of grown crystals would be changed from transparent yellow to opaque gray-black, and the quality of diamond crystals could also be destroyed markedly. When both boron and FeS co-doped, the negative effect of FeS on crystal quality could be eliminated somewhat. To a certain content of FeS, with the boron content increased, the crystal color would be changed from opaque gray-black to transparent yellow, and boron content needed is related directly to FeS content in growth systems. The nitrogen content in diamond lattice decreases greatly, with FeS content increased in the growth system, and a 1050cm-1 absorption peak in IR spectrum is also present in diamond crystals grown in FeNi-FeS-C system.

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Synthesis and characterization of boron and nitrogen co-doped diamond crystals under high pressure and high temperature conditions

CrystEngComm ◽

10.1039/c7ce00709d ◽

2017 ◽

Vol 19 (31) ◽

pp. 4571-4575 ◽

Cited By ~ 14

Author(s):

Meihua Hu ◽

Ning Bi ◽

Shangsheng Li ◽

Taichao Su ◽

Qiang Hu ◽

...

Keyword(s):

High Pressure ◽

High Temperature ◽

Temperature Gradient ◽

Gradient Method ◽

Synthesis And Characterization ◽

Temperature Conditions ◽

Diamond Crystals ◽

Temperature Gradient Method ◽

Co Doped

In this study, diamond crystals co-doped with boron and nitrogen were synthesized via a temperature gradient method at 5.3–5.8 GPa and 1300–1550 °C by adding B and N dopants to a system of carbon and an Fe-based solvent catalyst.

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Synthesis of large diamond crystals containing high-nitrogen concentration at high pressure and high temperature using Ni-based solvent by temperature gradient method

Chinese Physics B ◽

10.1088/1674-1056/19/11/118101 ◽

2010 ◽

Vol 19 (11) ◽

pp. 118101 ◽

Cited By ~ 10

Author(s):

Guo-Feng Huang ◽

Xiao-Peng Jia ◽

Shang-Sheng Li ◽

Ya-Fei Zhang ◽

Yong Li ◽

...

Keyword(s):

High Pressure ◽

High Temperature ◽

Temperature Gradient ◽

Gradient Method ◽

Nitrogen Concentration ◽

High Nitrogen ◽

Diamond Crystals ◽

High Nitrogen Concentration ◽

Temperature Gradient Method ◽

Large Diamond

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Effect of Ni70Mn25Co5 or Fe55Ni29Co16 on the Growth of Type-II a Large Diamonds with Al as Nitrogen Getter

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.266.89 ◽

2011 ◽

Vol 266 ◽

pp. 89-92

Author(s):

Shang Sheng Li ◽

Ning Luo ◽

Xiao Lei Li ◽

Tai Chao Su ◽

You Mou Zhou ◽

...

Keyword(s):

Growth Rate ◽

High Pressure ◽

High Temperature ◽

Temperature Gradient ◽

Nitrogen Concentration ◽

Type Ii ◽

High Quality ◽

Quality Type ◽

Temperature Gradient Method ◽

Large Diamond

With adopting Al as the nitrogen getter in Ni70Mn25Co5 or Fe55Ni29Co16 catalyst, High-quality type-Ⅱa large diamonds have been grown under the conditions of about 5.5GPa and 1580K by using the temperature gradient method. While Al(2.0wt%) is added in the Fe55Ni29Co16, the nitrogen concentration(Nc) in the diamond is less than 1ppm. While Al(4.0wt%) is added in the Ni70Mn25Co5, the Nc in the diamond is highly arrived at 48ppm. The different of solubility of nitrogen in both catalyst at high pressure and high temperature is the basic reason of the different effect of eliminating nitrogen of Al. It can be shown in experamentals that Al is a less efficient nitrogen getter in Ni70Mn25Co5 than in Fe55Ni29Co16. While Al(2.0wt%) is added in the Fe55Ni29Co16, the high-quality type-Ⅱa large diamond, in which nitrogen is less than 1ppm and which the size was arrived at 3.3mm, had grown by decreasing the growth rate of diamond.

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Synthesis of large diamond single crystals under high pressure and high temperature through effective utilization of the synthesis cavity

CrystEngComm ◽

10.1039/c8ce00786a ◽

2018 ◽

Vol 20 (29) ◽

pp. 4127-4132 ◽

Cited By ~ 9

Author(s):

Yong Li ◽

Yadong Li ◽

Ying Wang ◽

Jie Zhang ◽

Mousheng Song ◽

...

Keyword(s):

High Pressure ◽

High Temperature ◽

Single Crystals ◽

Production Efficiency ◽

Effective Utilization ◽

Diamond Crystals ◽

Diamond Single Crystals ◽

Large Diamond

To make maximal use of the synthesis cavity and improve the production efficiency, we designed the double seed bed method to synthesize large diamond crystals under high pressure and high temperature (HPHT) conditions, and the results were both theoretically calculated and verified by experiments.

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Correction: Synthesis and characterization of boron and nitrogen co-doped diamond crystals under high pressure and high temperature conditions

CrystEngComm ◽

10.1039/c7ce90129a ◽

2017 ◽

Vol 19 (34) ◽

pp. 5146-5146

Author(s):

Meihua Hu ◽

Ning Bi ◽

Shangsheng Li ◽

Taichao Su ◽

Qiang Hu ◽

...

Keyword(s):

High Pressure ◽

High Temperature ◽

Synthesis And Characterization ◽

Temperature Conditions ◽

Diamond Crystals ◽

Co Doped

Correction for ‘Synthesis and characterization of boron and nitrogen co-doped diamond crystals under high pressure and high temperature conditions’ by Meihua Hu et al., CrystEngComm, 2017, 19, 4571–4575.

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