Valance electron structure of carbide-diamond interface and catalytic mechanism for diamond synthesis under high-pressure and high-temperature

Gong, Junbo; Xu, Bin; Longwei, Yin; Yong-xin, QI; Li, Li; Su, Qingcai; Li, Musen

doi:10.1080/10020070612330079

Cited by 2 publications

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“…The carbons in Advanced Materials Research Vols. 399-401 graphite become metal carbides reacted to catalyst under the condition of high pressure and high temperature, and supply enough carbon to meet the demand for diamond synthesis as a transition phase [8][9][10].…”

Section: Resultsmentioning

confidence: 99%

The Research on Microstructure of Catalyst and Growth Mechanism of Boron-Doped Diamond

Zhang

Yin

et al. 2011

AMR

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The microstructure of catalyst discs and fracture topography of boron-doped diamond blocks are analyzed in this paper. The results show that boron can promote or inhibit the growth of diamond crystal. The battens of metal carbides in catalyst are the main carbon source in the nucleation and growth of diamond. Crystal nucleus can absorb the carbon atoms from metal carbide in catalyst disc, and continually grow. It is resulted that the carbon atoms around the diamond grains in catalyst disc reduce, and the battens of metal carbides are thin. The more diamond grains are produced, the thinner battens of metal carbides in catalyst disc are formed.

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Section: Resultsmentioning

confidence: 99%

The Research on Microstructure of Catalyst and Growth Mechanism of Boron-Doped Diamond

Zhang

Yin

et al. 2011

AMR

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Treatise on the Resolution of the diamond problem after 200 years

Little

Roache

2008

Progress in Solid State Chemistry

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Abstract:The problem of the physicochemical synthesis of diamond spans more than 200 years, involving many giants of science. Many technologies have been discovered, realized and used to resolve this diamond problem. Here the origin, definition and cause of the diamond problem are presented. The Resolution of the diamond problem is then discussed on the basis of the Little Effect, involving novel roton-phonon driven (antisymmetrical) multi-spin induced orbital orientation, subshell rehybridization and valence shell rotation of radical complexes in quantum fluids under magnetization across thermal, pressure, compositional, and spinor gradients in both space and time. Some experimental evidence of this magnetic quantum Resolution is briefly reviewed and integrated with this recent fruitful discovery. Furthermore, the implications of the Little Effect in comparison to the Woodward-Hoffman Rule are considered. The distinction of the Little Effect from the prior radical pair effect is clarified. The better compatibility of radicals, dangling bonds and magnetism with the diamond lattice relative to the graphitic lattice is discussed. Finally, these novel physicochemical phenomena for the Little Effect are compared with the natural diamond genesis. * corresponding author; email : redge_little@yahoo.com Keywords: diamond, high pressure, plasma deposition, catalytic properties, magnetic properties. Introduction -The Diamond Problem:A long history of giants of science has defined and contributed to the solution of the diamond problem. Section 2 considers the cause of the diamond problem. The list includes Newton, Boyle, Lavoisier, Guillton, Clouet, Karazin, Despretz, Hannay, Moisson, Roozeboom, Jessup, Rossini, Tammann, Parson, Einstein, Leipunski, Bridgman, Berman, Simon, Hershey, von Platen, Lundblad, Hall, Bundy, Strong, Wentorf, Cannon, Eversole, Deryagin, Angus, Fedoseev, Setaka, Matsumoto, Yugo, Linarres, Hemley, Sumiya, and Little. On the basis of these investigators, many technologies have been considered for resolving the diamond problem. These technologies include electric arcs; metal solvents; metal catalysts; electric ovens; electric resistive heaters; anvil vices and presses; electron beams; atomic beams; x-rays, alpha, and beta irradiators; exploding media; rapid lasing and liquid nitrogen quencher; chemical vapor deposition (CVD); hydrogenous plasma and microwave apparatuses; hot filaments; flames; and recently strong magnets. Some of these technologies have resulted in partial successes by the direct method, the indirect method and the H plasma metastable method of forming diamond. The complete Resolution here considers all three of these methods along with natural diamond formation and demonstrates complete Resolution by external magnetization (using external magnetization in conjunction with these three methods and considering intrinsic magnetism in mantle Kimberlite).On this basis, the synthesis and understanding of diamond have developed along side developments in chemistry, physics and engineering dur...

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Valance electron structure of carbide-diamond interface and catalytic mechanism for diamond synthesis under high-pressure and high-temperature

Cited by 2 publications

References 1 publication

The Research on Microstructure of Catalyst and Growth Mechanism of Boron-Doped Diamond

The Research on Microstructure of Catalyst and Growth Mechanism of Boron-Doped Diamond

Treatise on the Resolution of the diamond problem after 200 years

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