Growth of large size diamond single crystals by plasma assisted chemical vapour deposition: Recent achievements and remaining challenges

Pyrolysis experiments of melamine were carried out under high pressure of 5 GPa and different temperatures. The crystal structure, chemical bonding, and composition of the melamine pyrolysate were studied by X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray energy-dispersive analysis (EDX), and combustion elemental analysis. A new C–N–H phase was found in the pyrolysate at 5 GPa and 800 °C. The structure is tentatively indexed as a monoclinic symmetry, with the following lattice parameters: a = 8.5368 (±0.0009)A, b = 9.1153 (±0.0010)A, c = 10.2440 (±0.0011)A, α = γ = 90°, and β = 95.5696 (±0.0016)°. The photoluminescence behavior of the pyrolysates was investigated. A blue emission at 421 nm for the C–N–H phase was observed under the ultraviolet light excitation of 365 nm.

Phase transformation of melamine at high pressure and temperature

In this paper, the graphitic mixtures of C and BN have been subjected to high pressure and high temperature (HPHT) conditions to study the crystallization of the cubic phase, and new diamond crystals doped with B and N atoms (BCxN) were successfully synthesized with iron and nickel as catalysts. The morphology and characterization of our obtained diamond changed significantly, which was attributed to the incorporation of the B and N atoms into the crystal structure. In addition, we detected that the cubic phases obtained in the C0.9(BN)0.1 system were separated because of the different B/N ratio, while in the C0.5(BN)0.5 system no phase separation was found and the obtained “BCN” diamond exhibited cuboctahedral shape, light yellow in color, and nearly transparent. According to our results, two possible reaction routes were introduced for the crystallization of diamond in the graphitic mixtures of C and BN. Moreover, X-ray diffraction (XRD), Raman spectrum, X-ray photoelectron spectroscopy (XPS), and Fouri...

Synthesis and Characterization of New “BCN” Diamond under High Pressure and High Temperature Conditions

Effects of zinc additive on the HPHT synthesis of diamond in Fe-Ni-C and Fe-C systems

Modeling of effective design of high pressure anvils used for large scale commercial production of gem quality large single crystal diamond

Effects of additive Al on the HPHT diamond synthesis in an Fe–Mn–C system

The pressure-transmitting behavior and pressure distribution of a pyrophyllite cell in a cubic-anvil large volume high-pressure apparatus is investigated by finite-element analysis (FEA). The mechanical equations describing pyrophyllite under high pressure are given, which are composed of the Drucker–Prager criterion and a linear equation of state. The related material parameters such as cohesive strength, angle of internal friction etc. are experimentally measured. The FEA simulation includes the non-uniformity deviatoric stress caused by plastic deformation and the isotropy hydrostatic pressure of the pyrophyllite cell caused by volume compression. The results demonstrate that, in such a pyrophyllite cell, almost 90{%} of the pressure is isotropy hydrostatic pressure, and the pressure gradient mainly arise from non-uniform deviatoric stresses. Simulated data are displayed using the contour and the path plots.

Simulation of pressure distribution in a pyrophyllite high-pressure cell by finite-element analysis

Investigation of structural refinement and deformation mechanism induced by high pressure torsion in Ni1.5Co1.5CrTi0.4 multi-principle element alloy

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Papers

Effects of additive Al on the HPHT diamond synthesis in an Fe–Mn–C system

Simulation of pressure distribution in a pyrophyllite high-pressure cell by finite-element analysis

Investigation of structural refinement and deformation mechanism induced by high pressure torsion in Ni1.5Co1.5CrTi0.4 multi-principle element alloy