Low nitrogen concentration carbonaceous material and manufacturing method thereof

A low nitrogen concentration carbonaceous material in which a nitrogen concentration according to glow discharge mass spectrometry is 100 ppm or less.

A method of manufacturing a low nitrogen concentration carbonaceous material, which comprises heat treating a carbonaceous material subjected to a high purification treatment in a halogen gas atmosphere, at a pressure of 100 Pa or less and at 1800° C. or higher, releasing nitrogen in the carbonaceous material, then cooling the material to a predetermined temperature at a pressure of 100 Pa or less and then cooling the same to a room temperature in a rare gas atmosphere.

A method of manufacturing a low nitrogen concentration carbonaceous material, which comprises heat treating a carbonaceous material subjected to a high purification treatment in a halogen gas atmosphere, at a pressure of 100 Pa or less and at 1800° C. or higher, releasing nitrogen in the carbonaceous material, then introducing a rare gas and then cooling the material to a room temperature in a rare gas atmosphere.

A low nitrogen concentration carbonaceous material obtained from a carbonaceous material by applying a high purification treatment in a halogen containing gas atmosphere at 2400° C. or higher and then further supplying a halogen containing gas under a reduced pressure at 2000° C. or higher, having a nitrogen concentration content of 1×1017 atoms/cm3 or less using SIMS analysis.

A method of manufacturing a low nitrogen concentration carbonaceous material which comprises applying a high purification treatment to a carbonaceous material in a halogen containing gas atmosphere at 2400° C. or higher and then further supplying a halogen containing gas under a reduced pressure at 2000° C. or higher.