Studies on HPHT synthesis and N defects of N-rich B-doped diamonds

CrystEngComm ◽  
2018 ◽  
Vol 20 (44) ◽  
pp. 7109-7113 ◽  
Author(s):  
Xinyuan Miao ◽  
Liangchao Chen ◽  
Hongan Ma ◽  
Chao Fang ◽  
Longsuo Guo ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Temperature Gradient ◽  
Single Crystal ◽  
High Quality ◽  
Temperature Conditions ◽  
Ni Content ◽  
Growth Method

In this paper, high-quality N-rich single crystal diamonds with different boron additive contents were synthesized in NiMnCo alloy with high Ni content by the temperature gradient growth method under HPHT (high pressure and high temperature) conditions.

Influence of carbon convection field on high quality large single crystal diamonds morphology under high pressure and high temperature

RSC Advances ◽  
2016 ◽  
Vol 6 (46) ◽  
pp. 40330-40335 ◽  
Author(s):  
Yadong Li ◽  
Xiaopeng Jia ◽  
Bingmin Yan ◽  
Ning Chen ◽  
Chao Fang ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Temperature Gradient ◽  
Single Crystal ◽  
Large Single Crystal ◽  
High Quality

The temperature and convection fields of a catalyst with three different heights were simulated in a temperature gradient growth (TGG) system under high pressure and high temperature (HPHT) conditions.

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

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.

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.

scholarly journals High-Pressure Syntheses, Crystal Structures, And Thermal Behaviour Of β-Re(Bo2)3 (Re = Nd, Sm, Gd)

2007 ◽  
Vol 62 (6) ◽  
pp. 765-770 ◽  
Author(s):  
Holger Emme ◽  
Gunter Heymann ◽  
Almut Haberer ◽  
Hubert Huppertz
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Single Crystal ◽  
Crystal Structures ◽  
Thermal Behaviour ◽  
Diffraction Data ◽  
Ambient Pressure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Conditions

The compounds β -RE(BO2)3 [RE = Nd (neodymium meta-borate), Sm (samarium meta-borate) and Gd (gadolinium meta-borate)] were synthesized under high-pressure and high-temperature conditions in a Walker-type multianvil apparatus at 3.5 GPa (Nd), 7.5 GPa (Sm, Gd) and 1050 °C. The crystal structures were determined by single crystal X-ray diffraction data collected at r. t. (Sm, Gd) and at−73°C (Nd), respectively. The structures are isotypic with the already known ambient-pressure phases β -RE(BO2)3 (RE = (Tb, Dy) and the high-pressure phases β -RE(BO2)3 (RE = Ho-Lu)

Large single crystal diamond grown in FeNiMnCo–S–C system under high pressure and high temperature conditions

2016 ◽  
Vol 25 (11) ◽  
pp. 118104 ◽  
Author(s):  
He Zhang ◽  
Shangsheng Li ◽  
Taichao Su ◽  
Meihua Hu ◽  
Guanghui Li ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Single Crystal ◽  
Large Single Crystal ◽  
Temperature Conditions ◽  
Single Crystal Diamond

High-pressure Syntheses and Crystal Structures of Monoclinic B-Ho2O3 and Orthorhombic HoGaO3

2009 ◽  
Vol 64 (9) ◽  
pp. 1032-1040 ◽  
Author(s):  
Stefanie A. Hering ◽  
Hubert Huppertz
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Single Crystal ◽  
Crystal Structures ◽  
Diffraction Data ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Temperature Conditions ◽  
High Pressure High Temperature

Monoclinic holmium sesquioxide B-Ho2O3 and orthorhombic holmium orthogallate HoGaO3 were synthesized in a Walker-type multianvil apparatus under high-pressure / high-temperature conditions of 11.5 GPa / 1250 °C and 7.5 GPa / 1250 °C, respectively. Both crystal structures could be determined by single-crystal X-ray diffraction data, collected at r. t. The monoclinic holmium oxide crystallizes in the space group C2/m (Z = 6) with the parameters a = 1394.7(3), b = 350.83(7), c = 865.6(2) pm, β = 100.23(3)°, R1 = 0.0517, wR2 = 0.1130 (all data), and the orthorhombic compound HoGaO3 in Pnma (Z = 4) with the parameters a = 553.0(2), b = 753.6(2), c = 525.4(2) pm, R1 = 0.0222, and wR2 = 0.0303 (all data).

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