Sectorial structure and laminar growth of synthetic diamond crystals

1975 ◽  
Vol 29 (3) ◽  
pp. 296-300 ◽  
Author(s):  
A.S. Vishnevsky
Keyword(s):  
Synthetic Diamond ◽  
Diamond Crystals ◽  
Sectorial Structure

Effect of pressure on synthetic diamond crystals at high temperatures and pressures in Fe/Ni catalyst system

CrystEngComm ◽  
2021 ◽  
Author(s):  
Shuai Fang ◽  
Yongkui Wang ◽  
Liangchao Chen ◽  
Zhiyun Lu ◽  
Zhenghao Cai ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Growth Mechanism ◽  
Synthetic Diamond ◽  
Natural Diamond ◽  
Catalyst System ◽  
Necessary Condition ◽  
Ni Catalyst ◽  
Effect Of Pressure ◽  
Diamond Crystals ◽  
System P

Pressure is a necessary condition for the growth of natural diamond. Studying the effect of pressure on the nitrogen content of diamond is important for exploring the growth mechanism of...

Synthetic diamond crystal strength enhancement through annealing at 50 kbar and 1500 °C

1995 ◽  
Vol 10 (7) ◽  
pp. 1700-1709 ◽  
Author(s):  
Steven W. Webb ◽  
W.E. Jackson
Keyword(s):  
Diamond Crystal ◽  
Synthetic Diamond ◽  
Diamond Lattice ◽  
Type I ◽  
Strength Enhancement ◽  
High Metal Content ◽  
Diamond Crystals ◽  
High Pressure High Temperature ◽  
High Metal ◽  
Low Levels

High-pressure, high temperature (HPHT) annealing of synthetic type I diamond crystals at 1200–1700 °C and 50–60 kbar was found to induce aggregate-nitrogen dissociation and metal coalescence as well as heal diamond lattice dislocations. For crystals with low levels of metal inclusions, HPHT annealing was observed to increase the average compressive fracture strength of the crystals by apparently strengthening the strongest crystals of the population. Crystals with high metal-content, or otherwise of low quality, are weakened by anncaling. Strengthening is believed to occur by locally stabilizing the diamond lattice by healing lattice dislocations as well as dispersing nitrogen within the lattice. A general model is presented that ties together these results with those of other researchers.

scholarly journals High-Quality Synthetic Diamond Crystals.

1998 ◽  
Vol 7 ◽  
pp. 960-965 ◽  
Author(s):  
H. Sumiya ◽  
S. Satoh ◽  
S. Yazu
Keyword(s):  
Synthetic Diamond ◽  
High Quality ◽  
Diamond Crystals

Thermoluminescence of nickel-doped synthetic diamond crystals

2000 ◽  
Vol 88 (8) ◽  
pp. 4648 ◽  
Author(s):  
M. Benabdesselam ◽  
P. Iacconi ◽  
D. Briand ◽  
A. Berkane-Krachaı̈ ◽  
E. Gheeraert ◽  
...  
Keyword(s):  
Synthetic Diamond ◽  
Diamond Crystals

TEM and DSC Studies on the Synthetic Diamond Grown from Fe-Ni-C-B System under HPHT

2011 ◽  
Vol 320 ◽  
pp. 3-7
Author(s):  
Jian Hong Gong ◽  
Shu Xia Lin ◽  
Jun Gao
Keyword(s):  
Thermal Stability ◽  
Boron Content ◽  
Synthetic Diamond ◽  
Scanning Calorimetry ◽  
Dsc Studies ◽  
Diamond Crystals ◽  
Transmission Electron ◽  
High Pressure High Temperature ◽  
Alloy Catalysts ◽  
Thermal Stability Of

Transmission Electron Microscope (TEM) and Different Scanning Calorimetry (DSC) Methods Were Used to Investigate the Diamonds Grown with Different Boron Content Alloy Catalysts under High-Pressure High-Temperature (HPHT). Experimental Results Demonstrated the Microstructure and Composition of Boride Compounds in Synthetic Diamond, such as (FeNi)23(CB)6 ,(Fe, Ni)3(C,B), (Fe,Ni)B and B4C, Whose Formation Process Was Analyzed. the Thermal Stability of Diamond Depends on Boron Concentration in Catalyst According to DSC Studies. we Analyzed the Reason of Diamond Oxidation.The Work Offers Valuable Information for Improving the Thermal Stability of Synthetic Diamond Crystals by Adjusting Boron Content in the Fe-Ni Based Catalyst.

The invar property of the metallic inclusions in synthetic diamond crystals grown in the FeNiC system

1992 ◽  
Vol 150 (1) ◽  
pp. L9-L10 ◽  
Author(s):  
E Pavel ◽  
Gh Bǎlutǎ ◽  
C Giurgiu ◽  
D Barb ◽  
D.P Lazǎr ◽  
...  
Keyword(s):  
Synthetic Diamond ◽  
Diamond Crystals ◽  
Metallic Inclusions ◽  
Invar Property

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.

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