Method for producing single crystal diamond and single crystal diamond
Provided are a method for producing a single crystal diamond capable of synthesizing a single crystal diamond having excellent durability at a low cost in a short time, and the single crystal diamond. The method for producing the single crystal diamond employs a high-temperature and high-pressure method, and the single crystal diamond is synthesized by exposing raw materials composed of amorphous carbon and a carbon compound to a pressure and a temperature in a thermodynamically stable region of the diamond in a carbon phase equilibrium diagram.
1 . A method for producing a single crystal diamond using a high-temperature and high-pressure method,
which comprises synthesizing the diamond by mixing raw materials consisting of amorphous carbon and carbon compounds having hydrogen and/or hydroxyl groups in a mass ratio of the amorphous carbon: the carbon compounds=7:3 to 4:6, and retaining under conditions of pressure of 5 to 10 GPa and temperature of 1300 to 1800° C. for 1 to 300 seconds.
2 . The method for producing the single crystal diamond according to claim 1 ,
wherein the amorphous carbon is carbon black, and
wherein the carbon compounds are at least one of aliphatic hydrocarbons, alcohols, and polyhydric alcohols.
3 . The method for producing the single crystal diamond according to claim 2 ,
wherein the aliphatic hydrocarbon is polyethylene,
wherein the alcohol is methanol, and
wherein the polyhydric alcohol is pentaerythritol or xylitol.
4 . The method for producing the single crystal diamond according to claim 1 ,
wherein a peak near 1332 cm −1 exists in the Raman spectrum.
5 . The method for producing the single crystal diamond according to claim 2 ,
wherein a peak near 1332 cm −1 exists in the Raman spectrum.
6 . The method for producing the single crystal diamond according to claim 3 ,
wherein a peak near 1332 cm −1 exists in the Raman spectrum.