| 摘要 |
A low nitrogen concentration carbonaceous material with a nitrogen concentration according to glow discharge mass spectrometry of 100 ppm or less, as well as a manufacturing method thereof are provided. ÄMEANS FOR SOLUTIONÜ <??>A carbonaceous material subjected to a high purification treatment in a halogen gas atmosphere is heat treated under a pressure of 100 Pa or less and at a temperature of 1800 DEG C or higher, releasing nitrogen in the carbonaceous material and then cooling the material under a pressure of 100 Pa or less or in a rare gas atmosphere. |
