(Fe1−xMex)3C carbide identification in synthetic diamond crystals produced at high pressure and high temperature in FeMeC systems, where Me  Ni, Co

1990 ◽  
Vol 10 (1-2) ◽  
pp. 62-65 ◽  
Author(s):  
E. Pavel ◽  
Gh. Băluţă ◽  
D. Barb ◽  
L. Gheorghe ◽  
Gh. Ilie ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Synthetic Diamond ◽  
Diamond Crystals

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

2011 ◽  
Vol 339 ◽  
pp. 491-495
Author(s):  
Chuan Yi Zang ◽  
Lun Jian Chen ◽  
Li Xue Chen
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Boron Content ◽  
Diamond Crystals ◽  
Growth System ◽  
Negative Effect ◽  
Temperature Gradient Method ◽  
Co Doped ◽  
Large Diamond

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.

scholarly journals Superhard Superconductor Composites Obtained by Sintering of Diamond, c-BN and C60 Powders with Superconductors

2006 ◽  
Vol 61 (12) ◽  
pp. 1541-1546 ◽  
Author(s):  
Gennadi A. Dubitsky ◽  
Vladimir D. Blank ◽  
Sergei G. Buga ◽  
Elena E. Semenova ◽  
Nadejda R. Serebryanaya ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Critical Temperature ◽  
Boron Nitride ◽  
Synthetic Diamond ◽  
Cubic Boron Nitride ◽  
High Pressure High Temperature ◽  
Diamond Powders

Superhard superconducting samples with a critical temperature of TC = 10.5 - 12.6 K were obtained by high-pressure / high-temperature sintering of synthetic diamond powders coated with a niobium film and in 50% - 50% composition with superhard C60 fullerene. Superhard superconductors with TC = 9.3 K were obtained when diamond and molybdenum powders were sintered at a pressure of 7.7 GPa and a temperature of 2173 K. Superconducting samples with TC = 36.1 - 37.5 K have been obtained in the systems diamond-MgB2 and cubic boron nitride-MgB2.

Growth and annealing study of hydrogen-doped single diamond crystals under high pressure and high temperature

2012 ◽  
Vol 21 (5) ◽  
pp. 058101 ◽  
Author(s):  
Yong Li ◽  
Xiao-Peng Jia ◽  
Mei-Hua Hu ◽  
Xiao-Bing Liu ◽  
Bing-Min Yan ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Diamond Crystals ◽  
Annealing Study

Cellular interface in diamond crystals from a Fe–Ni–C system at high temperature and high pressure

2002 ◽  
Vol 360 (1-2) ◽  
pp. 167-174 ◽  
Author(s):  
Long-Wei Yin ◽  
Mu-Sen Li ◽  
Zhao-Yin Hao ◽  
Ying-Xin Wang
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Diamond Crystals

Strain and Impurity Content of Synthetic Diamond Crystals

1994 ◽  
Vol 349 ◽  
Author(s):  
T. L. Mccormick ◽  
W. E. Jackson ◽  
R.J. Nemanich
Keyword(s):  
Raman Spectroscopy ◽  
High Pressure ◽  
Synthetic Diamond ◽  
Impurity Content ◽  
Nitrogen Forms ◽  
Inclusion Content ◽  
Diamond Crystals ◽  
High Pressure High Temperature ◽  
Photoluminescence Studies ◽  
Integrated Intensities

ABSTRACTSamples of diamond crystals produced under various high pressure, high temperature conditions were studied using both micro photoluminescence and Raman spectroscopy. The 0.3 - 0.6 mm sized samples exhibited various levels of inclusion content, impurity content and strain. Photoluminescence studies revealed the presence of nitrogen in three forms. The 1.945 eV, 2.15 eV and 2.46 eV zero phonon lines and their associated sidebands were detected. The ratios between forms of impurities and their integrated intensities varied between samples. Variations in the distribution of the nitrogen forms were seen between regions of high and low strain birefringence patterns.

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

CrystEngComm ◽  
2017 ◽  
Vol 19 (31) ◽  
pp. 4571-4575 ◽  
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.

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

CrystEngComm ◽  
2018 ◽  
Vol 20 (29) ◽  
pp. 4127-4132 ◽  
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.

Partial graphitization of diamond crystals under high-pressure and high-temperature conditions

2001 ◽  
Vol 90 (3) ◽  
pp. 1632-1637 ◽  
Author(s):  
Jiang Qian ◽  
Cristian Pantea ◽  
G. Voronin ◽  
T. W. Zerda
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Temperature Conditions ◽  
Diamond Crystals

scholarly journals Experimental Study of Surface Etching in Synthetic Diamond Microcrystals due to Presence of Cu and Fe at High Pressure

2020 ◽  
pp. 18-21
Author(s):  
I.A. Ishutin ◽  
A.A. Chepurov ◽  
E.I. Zhimulev
Keyword(s):  
Experimental Study ◽  
High Pressure ◽  
Synthetic Diamond ◽  
Close Contact ◽  
High Pressure Cell ◽  
Diamond Composite ◽  
Refractory Oxides ◽  
Diamond Crystals ◽  
Composite Diamond ◽  
High Pressure Apparatus

In the present work, microcrystals of synthetic diamond extracted from a metal-diamond composite were investigated. A composite based on Cu and Fe was obtained by sintering at a pressure of 4 GPa and a temperature of1300 °C. The experiments were carried out using a split-sphere high-pressure apparatus BARS. The high-pressure cell was made of refractory oxides ZrO2, CaO, and MgO using a tubular graphite heater. In the composite, diamond grains were in close contact with neighboring diamonds, and the metal phase filled the interstices. The study of the diamond crystals demonstrated the appearance of newly formed micromorphological structures on the surfaces in the form of numerous cavities of irregular shape on the faces of octahedron, as well as pyramids on the faces of cube, the morphological elements of which follow the contours of the cube face of the diamond. Thus, the results of the work evidence for the processes of etching of the diamond crystals during the experiments, which is associated with the presence of metallic iron in the composite. This type of etching forms a roughly cavernous surface on the diamond crystals, which can be considered as an additional factor for improving the metal-diamond bond in copper-based composites.

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