Patent ID: 11905620
Assignee: QUFU NORMAL UNIVERSITY
Field: Surface technology, coating (Chemistry)
Classification: CPC C  G | IPC C  G

Claim 3:
4. A method for preparing a diamond anvil, comprising:
(1) a synthesis of a diamond containing high quality nitrogen vacancies, comprising:
using an iron-nickel catalyst system, taking a flaky graphite with a high-purity greater than 99.9% as a carbon source, taking a <111> diamond as a crystal seed, and taking Al/Ti as a nitrogen remover, synthesizing a single crystal diamond by keeping a temperature of 1350° C. for 10 h at a pressure of 6.5 GPa;
(2) an annealing treatment, comprising:
performing a HPHT annealing on the single crystal diamond with an annealing pressure of 6.5 Gpa for 1 h at temperatures of 1600° C.; and
(3) a cutting of the diamond anvil, comprising:
placing an anvil surface of the diamond anvil inside a <100> crystal orientation growth region, and placing a main body of the diamond anvil in the <111> crystal orientation growth region; wherein a thickness of the anvil surface is 15 μm, and a depth of the nitrogen vacancies in the obtained diamond anvil is 15 μm.