US 4,632,817 A · Method of synthesizing diamond

Abstract

A diamond synthesizing method carried out under diamond-stable superhigh pressure and temperature by employing a synthesizing vessel (10) having a plurality of synthesizing chambers (10a, 10b) divided by a partition layer (16) in the vertical direction. Solvent metals (13a, 13b) respectively placed in the upwardly arranged synthesizing chamber (10a) and the downwardly arranged synthesizing chamber (10b) are prepared so that the solvent metals are different in eutectic temperature with carbon from each other. In the respective synthesizing chambers (10a, 10b), carbon sources (12a, 12b) are placed in contact with highest-temperature portions of the respective solvent metals (13a, 13b) and seed crystals (11a, 11b) are placed in contact with lowest-temperature portions thereof. The synthesizing vessel (10) is provided with a temperature gradient in such directivity that the upper part thereof is at a higher temperature and the lower part is at a lower temperature.

Claims13

Dependent claims

A method of synthesizing diamond under diamond-stable superhigh pressure and temperature by employing carbon sources, solvent metals for dissolving said carbon sources and seed crystals to grow diamond crystals, said method comprising the steps of:

preparing a synthesizing vessel divided into at least two synthesizing chambers by one or more partition layers;
placing said solvent metals which are different from each other in eutectic temperature with respect to carbon, in the respective at least two synthesizing chambers of said synthesizing vessel, placing said carbon sources to be in contact with highest-temperature portions of said solvent metals and placing said seed crystals in contact with lowest-temperature portions of said solvent metals in respective ones of said divided synthesizing chambers, and
growing diamond crystals in said solvent metals in respective ones of said divided synthesizing chambers, said growing step including providing a temperature gradient from a high temperature to a low temperature across said at least two synthesizing chambers.

A method of synthesizing diamond under diamond-stable superhigh pressure and temperature, comprising the steps of:

(a) preparing a synthesizing vessel divided into at least two synthesizing chambers;
(b) positioning at least one seed crystal in each of the at least two synthesizing chambers;
(c) positioning a solvent metal in contact with the at least one seed crystal in each of the at least two synthesizing chambers, the solvent metals in the at least two synthesizing chambers being different from each other in eutectic temperature with respect to carbon, each of the solvent metals having a high temperature portion and a low temperature portion which is in contact with the corresponding at least one seed crystal;
(d) positioning carbon sources in contact with the high temperature portions of the respective solvent metals in the respective at least two synthesizing chambers;
and
(e) growing diamond crystals in the solvent metals using diamond-stable superhigh pressure and temperature including providing a temperature gradient from a high temperature to a low temperature across the at least two synthesizing chambers.

3 more elements

Dependencies are inferred from the claim text.

Method of synthesizing diamond

Life of this patent

Method of synthesizing diamond

Life of this patent

Abstract

Claims13