Characterization of nitrogen doped chemical vapor deposited single crystal diamond before and after high pressure, high temperature annealing

2004 ◽  
Vol 201 (11) ◽  
pp. 2473-2485 ◽  
Author(s):  
S. J. Charles ◽  
J. E. Butler ◽  
B. N. Feygelson ◽  
M. E. Newton ◽  
D. L. Carroll ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Chemical Vapor ◽  
High Temperature Annealing ◽  
Nitrogen Doped ◽  
High Pressure High Temperature ◽  
Single Crystal Diamond ◽  
Chemical Vapor Deposited ◽  
Before And After

Growth of Diamond Anvils for High-Pressure Research by Chemical Vapor Deposition

1997 ◽  
Vol 499 ◽  
Author(s):  
Andrew Israel ◽  
Yogesh K. Vohra
Keyword(s):  
High Pressure ◽  
Chemical Vapor Deposition ◽  
High Temperature ◽  
Growth Rates ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Diamond Growth ◽  
High Pressure High Temperature ◽  
Single Crystal Diamond ◽  
Diamond Anvils

ABSTRACTGem quality diamond crystals are employed as anvils in high-pressure diamond cell research. Homoepitaxial growth experiments by microwave plasma-assisted chemical vapor deposition (MPCVD) have produced 1.76 mm (diameter) by 0.65 mm (thickness) sized diamonds. We report fundamental studies on diamond growth rate and quality as a function of reactor pressure and methane concentration, in a hydrogen plasma. By varying the growth conditions, large, single crystal diamond can be produced, which is ideal for manufacturing high pressure anvils.Traditional high pressure, high temperature (HPHT) techniques for production of synthetic diamond anvils are extremely expensive and chemical vapor deposition (CVD) provides an economically viable alternative. We report diamond growth rates up to 0.32 mg/hr, which are comparable to HPHT growth rates, and crystal quality approaching that of gem diamond. When perfected, diamond anvils produced from chemical vapor deposition methods could replace those manufactured by high pressure, high temperature synthesis.

scholarly journals Multianvil High-Pressure/High-Temperature Synthesis and Characterization of multiferroic HP-Co3TeO6

2021 ◽  
Author(s):  
Gunter Heymann ◽  
Elisabeth Selb ◽  
Toni Buttlar ◽  
Oliver Janka ◽  
Martina Tribus ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Type Structure ◽  
Synthesis And Characterization ◽  
Temperature Synthesis ◽  
Space Group ◽  
Crystal System ◽  
High Temperature Synthesis ◽  
High Pressure High Temperature

By high-pressure/high-temperature multianvil synthesis a new high-pressure (HP) phase of Co3TeO6 was obtained. The compound crystallizes in the acentric trigonal crystal system of the Ni3TeO6-type structure with space group R3...

scholarly journals High-pressure synthesis and characterization of the non-centrosymmetric scandium borate ScB6O9(OH)3

2020 ◽  
Vol 75 (6-7) ◽  
pp. 597-603
Author(s):  
Birgit Fuchs ◽  
Hubert Huppertz
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressure High Temperature ◽  
Structure Solution ◽  
Temperature Experiment ◽  
Pressure Synthesis

AbstractThe non-centrosymmetric scandium borate ScB6O9(OH)3 was obtained through a high-pressure/high-temperature experiment at 6 GPa and 1473 K. Single-crystal X-ray diffraction revealed that the structure is isotypic to InB6O9(OH)3 containing borate triple layers separated by scandium layers. The compound crystallizes in the space group Fdd2 with the lattice parameters a = 38.935(4), b = 4.4136(4), and c = 7.6342(6) Å. Powder X-ray diffraction and vibrational spectroscopy were used to further characterize the compound and verify the proposed structure solution.

scholarly journals High-Pressure, High-Temperature Synthesis and Characterization of Polar and Magnetic LuCrWO6

2020 ◽  
Vol 59 (6) ◽  
pp. 3579-3584
Author(s):  
Sun Woo Kim ◽  
Xiaoyan Tan ◽  
Corey E. Frank ◽  
Zheng Deng ◽  
Huaiyu Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Synthesis And Characterization ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
High Pressure High Temperature

scholarly journals Low-Power Laser Graphitization of High Pressure—High Temperature Nanodiamond Films

2020 ◽  
Vol 10 (9) ◽  
pp. 3329
Author(s):  
Konstantin G. Mikheev ◽  
Tatyana N. Mogileva ◽  
Arseniy E. Fateev ◽  
Nicholas A. Nunn ◽  
Olga A. Shenderova ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Laser Excitation ◽  
X Ray Diffraction ◽  
Power Laser ◽  
Green Luminescence ◽  
X Ray ◽  
Atomic Force ◽  
High Pressure High Temperature ◽  
Before And After

Laser-induced graphitization of 100 nm monocrystals of diamond particles synthesized by high-pressure high-temperature (HP-HT) methods is not typically observed. The current study demonstrates the graphitization of 150 nm HP-HT nanodiamond particles in ca. 20-μm-thick thin films formed on a glass substrate when the intensity of a focused 633 nm He-Ne laser exceeds a threshold of ~ 33 kW/cm2. Graphitization is accompanied by green luminescence. The structure and morphology of the samples were investigated before and after laser excitation while using X-ray diffraction (XRD), Raman spectroscopy, atomic force (AFM), and scanning electron microscopy (SEM). These observations are explained by photoionization of [Ni-N]- and [N]-centers, leading to the excitation of electrons to the conduction band of the HP-HT nanodiamond films and an increase of the local temperature of the sample, causing the transformation of sp3 HP-HT nanodiamonds to sp2-carbon.

Composite chemical vapor deposition diamond anvils for high-pressure/high-temperature experiments

2009 ◽  
Vol 29 (2) ◽  
pp. 317-324 ◽  
Author(s):  
Chang-Sheng Zha ◽  
Szczesny Krasnicki ◽  
Yu-Fei Meng ◽  
Chih-Shiue Yan ◽  
Joseph Lai ◽  
...  
Keyword(s):  
High Pressure ◽  
Chemical Vapor Deposition ◽  
High Temperature ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Chemical Vapor Deposition Diamond ◽  
High Pressure High Temperature ◽  
Diamond Anvils

High Pressure High Temperature (HPHT) Synthesis and Physical Characterization of Magneto-Superconducting RuSr2Tb1.5Ce0.5Cu2O10 Ceramic Compound

2006 ◽  
Vol 47 ◽  
pp. 31-36
Author(s):  
Alberto Ubaldini ◽  
V.P.S. Awana ◽  
S. Balamurugan ◽  
E. Takayama-Muromachi
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Magnetic Transition ◽  
Magnetic Ordering ◽  
Superconducting Transition ◽  
Synthesis Conditions ◽  
High Pressure High Temperature ◽  
Interesting Class ◽  
Ceramic Compound

The ruthenocuprates family is a very interesting class of materials, because of the coexistence of superconductivity and magnetic ordering. Ruthenocuprates include RuSr2RECu2O8 and RuSr2(RE,Ce)2Cu2O10- (RE = rare earth elements or Y). It is possible to synthesize samples of these phases with Gd, Eu or Sm with normal synthesis conditions. For the others high-pressure high-temperature (HPHT) synthesis is required. We had successfully synthesized the RuSr2Tb1.5Ce0.5Cu2O10 by HPHT technique, starting from RuO2, SrO2, Tb4O7, CeO2, CuO and Cu. Around 300 mg of the mixture was allowed to react in a flat-belt-typehigh- pressure apparatus at 6GPa and 1200 °C – 1550 °C. The optimised temperature of synthesis was found to be in the range between 1350 °C – 1450 °C. The as-synthesized compound crystallized with a structure belonging to the space group I4/mmm. DC magnetic susceptibility versus temperature plot for RuSr2Tb1.5Ce0.5Cu2O10 in an applied field of 10 Oe demonstrated magnetic transition at 150 K but the superconducting transition was not clearly observed. To our knowledge this is the first successful synthesis of the Tb based Ru-1222 phase.

Ni6B22O39·H2O – extending the field of nickel borates

2017 ◽  
Vol 72 (12) ◽  
pp. 967-975 ◽  
Author(s):  
Martin K. Schmitt ◽  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
High Temperature ◽  
Temperature Reaction ◽  
Orthorhombic Space Group ◽  
X Ray ◽  
High Temperature Reaction ◽  
High Pressure High Temperature ◽  
Related Phase

AbstractNi6B22O39·H2O was synthesized in a high-pressure/high-temperature reaction at 5 GPa/900°C. It crystallizes in the orthorhombic space group Pmn21 (no. 31) with the lattice parameters a=7.664(2), b=8.121(2) and c=17.402(2) Å. The crystal structure is discussed with regard to the isotypic compounds M6B22O39·H2O (M=Fe, Co) and the structurally related phase Cd6B22O39·H2O. Furthermore, the characterization of Ni6B22O39·H2O via X-ray powder diffraction and vibrational spectroscopy is reported.

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