Growth of diamond from methane above 1100�C

Федосеев, Д. В.; Varshavskaya, I.G.; Lavrent'ev, A. V.; Deryagin, B. V.

doi:10.1007/bf01108219

Cited by 7 publications

(9 citation statements)

References 1 publication

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“…The energy of the diamond nucleus forma tion is defined as [4] (4) where σ is the surface diamond energy and r is the crit ical radii of diamond.…”

Section: S K Simakovmentioning

confidence: 99%

“…Different metals are using for decreas ing the synthesis pressure, and silicate carbonate melts are also used for it [3]. In general, the energy of the diamond nucleus formation from the metal car bon system is defined as [4] (3) where σ is the surface energy of the diamond metal boundary, h 3 is the volume of a carbon atom in dia mond, ad Δμ is difference of the diamond and graphite chemical potentials.…”

Section: S K Simakovmentioning

confidence: 99%

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Different sizes of diamond formation in natural processes

Simakov¹

2015

Dokl. Earth Sc.

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“…The energy of the diamond nucleus forma tion is defined as [4] (4) where σ is the surface diamond energy and r is the crit ical radii of diamond.…”

Section: S K Simakovmentioning

confidence: 99%

Section: S K Simakovmentioning

confidence: 99%

Different sizes of diamond formation in natural processes

Simakov¹

2015

Dokl. Earth Sc.

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“…So, with almost identical short-range order in structures of ZnS resistant metastable sphalerite and wurtzite in nature is formed predominantly wurtzite [21]. When growing diamond is used, the methods of education in a stable conditions of high pressure [21] with the subsequent preservation due to the kinetic difficulties of the transition in graphite, and epitaxial growth at low pressures, where diamond is metastable [22].…”

Section: Recognition Memory and Agingmentioning

confidence: 99%

“Life, Memory, Recognition and Aging” of Grey Tin

Styrkas¹

2016

MSCE

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It was shown that tin has two types of memory: 1) "memory of the structure" about of the event when it was in the α configuration, and 2) "memory of recognition (discern)" whereby tin recognises that an object with which it in contact, was previously in contact with substances of a particular type ("infection"). Transformations of metallic white tin into the grey semiconductor occur with the help of either small pieces of grey tin or other substances isomorphous with grey tin [1] [2] [3]. These pieces (when pressed into white tin) initiate phase transition (by "infection") from white tin into grey tin. Once the tin is transformed into its grey form, it retains a "memory" about this after it is transferred back into white tin. Thus, for second and subsequent phase transformations, there is no need for external initiators to be used. The tin has the "memory of recognition" too-when the tin can recognises that an object with which it is in contact, was previously in contact with the "infection". This phenomenon is concerned with the aging of tin: firstly, with the loss of "memory of the structure" of tin of the event when it was in the grey tin configuration, and, secondly, with the loss of "memory of recognition" of tin whereby the tin recognises that an object with which it is in contact, was previously in contact with substances of a particular type. Factors that effect the aging of tin has been studied in detail and an explanation of the mechanism of action of these factors has been suggested.

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“…Nanosize diamond particles have energetic preference upon graphitic particles of the same size and could be more stable at low P-T parameters (ref.1) [11][12][13] . Fedoseev et al 14 have shown that critical radii of graphite and diamond nuclei depends upon the surface energy (σ), atomic volume of carbon (V) and chemical potential of the resaturation (∆µ):…”

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confidence: 99%

Metastable Nanosized Diamond Formation from Fluid Systems

Simakov

2010

Nat Prec

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The model of nanosized diamond particles formation at metastable P-T parameters from fluid is presented. It explains the specific of CVD diamond synthesis gases mixtures and hydrothermal growth of diamond at low P-T parameters as well as it explains the geneses of metamorphic and magmatic nano-and microdiamond in the shallow depth Earth rocks and the genesis of interstellar nanodiamond formations in the space.The optimal gases system compositions for metastable diamond formations have been long debated in many publications during the long period. Badziag et al. 1 came to the conclusion that nanometer-sized diamonds could be more stable than graphite when formed from hydrocarbons with a H/C ratio of more than 0.24.

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Growth of diamond from methane above 1100�C

Cited by 7 publications

References 1 publication

Different sizes of diamond formation in natural processes

Different sizes of diamond formation in natural processes

“Life, Memory, Recognition and Aging” of Grey Tin

Metastable Nanosized Diamond Formation from Fluid Systems

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