Method of growing diamond from graphite
AssigneeFizichesky Institut Imeni P.N./Lebedeva Rossiiskoi Akademii Nauk
InventorsAlexandr Georgievich Molchanov, Vladislav Borisovich Rozanov
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Abstract
A method is proposed for growing diamond from graphite, including placing a sample of graphite in a high pressure chamber, applying a pulse-periodical laser radiation having a wavelength in the region of transmission of diamond to the sample of graphite, wherewith absorption of the pulse of laser radiation takes place in the skin-layer of graphite and the graphite is heated in the region of the skin-layer to the temperature of graphite-to-diamond phase transition. After cooling the produced layer of diamond, the steps of heating successive layers of the sample of graphite with pulses of laser radiation and cooling said layers are repeated until complete transformation of the graphite to diamond.
Claims14
A method of growing diamond from graphite, comprising the following steps:
- providing a high pressure chamber;
- placing a sample consisting essentially of compressed graphite in said chamber;
- maintaining an essentially constant high pressure during the whole process of growing diamond;
- applying a pulse of pulse-periodical laser radiation having a wavelength in the transmission region of diamond to said sample of graphite so as to heat the heating the skin-layer of said sample of graphite with said laser radiation pulse absorbed in that layer to the graphite-to-diamond phase transition temperature and produce a layer of diamond from said skin-layer, wherein said layer is transparent to subsequent applications of pulse-periodical laser radiation such that a subsequent application will reach a next skin-layer of graphite underlying and adjacent said layer of diamond;
- and
- cooling said layer of diamond.
A method of growing diamond from graphite, comprising the following steps:
- a) providing a high pressure chamber;
- b) placing a sample consisting essentially of compressed graphite in said chamber;
- c) maintaining an essentially constant high pressure during the whole process of growing diamond;
- d) applying a pulse of pulse_periodical laser radiation having a wavelength in the transmission region of diamond to said sample of graphites so as to heat the heating the skin-layer of said sample of graphite with said pulse of said laser radiation absorbed in that layer to the temperature of graphite-to-diamond phase transition and produce a layer of diamond from said skin-layer such that a subsequent application will reach a next skin-layer of graphite underlying and adjacent said layer of diamond;
- e) cooling said layer of diamond;
- and
- f) repeating steps (d) and (e) for successive layers of said sample of graphite until the completion of the transformation of graphite into diamond.
A method for growing diamond from graphite, comprising the following steps:
- providing a high pressure chamber;
- placing a sample consisting essentially of compressed graphite in said chamber;
- maintaining a high pressure during the whole process of growing diamond;
- applying laser radiation in the ultraviolet range of the spectrum in the transmission region of diamond to said sample of graphite so as to transform the skin-layer of said sample of graphite into a layer of diamond as a result of photochemical application of said laser radiation to said skin-layer of the sample of graphite, ensuring rearrangement of the valence bonds of the graphite, resulting in a diamond-graphite phase transition that produces layer of diamond that is transparent to laser radiation such that subsequent treatments by laser radiation will reach the skin-layer of graphite underlying and adjacent said layer of diamond.
Dependencies are inferred from the claim text.