Patent ID: 11905620

Abstract:
Preparations of a highly coherent diamond nitrogen vacancy (NV−) and a diamond anvil are provided. A graphite is used as a carbon source, a diamond is used as a crystal seed, aluminum/titanium is used as a nitrogen remover, and a single crystal diamond is synthesized under a high temperature and a high pressure, and high-pressure-high-temperature (HPHT) annealing is performed on the synthesized diamond; after the annealing, multiple NV−s are generated in <100> and <311> crystal orientation growth regions from scratch, while native NV−s in a <111> crystal orientation growth region are disappeared; and the <100> and <311> crystal orientation growth regions do not contain defects related to ferromagnetic elements. The high-density and highly coherent NV−s are produced under nondestructive conditions, and the diamond anvil with controlled NV− depths are prepared to achieve a precise detection of the NV− at a pressure above 60 GPa.