Synthetic diamond-containing material and method of obtaining it

In a synthetic diamond-bearing material consisting essentially of aggregates of particles of a round or irregular shape, with an average diameter of the particles not exceeding 0.1.mu., the improvement wherein the material comprises:

• a) elemental composition (% by mass):
• ______________________________________ carbon 75 to 90, hydrogen 0.8 to 1.5, nitrogen 0.6 to 4.5, oxygen the balance;
• ______________________________________
• b) phase composition (% by mass):
• amorphous carbon 10 to 30, diamond of cubic crystal structure the balance;
• c) a porous structure said material having pores with a volume of the pores being within about 0.6 to 1.0 cm.sup.3 /g;
• d) a material surface with 10 to 20% of the material surface being methyl, nitrile, first and second hydroxyl groups having different chemical shifts in an NMR spectrum and one or more oxycarboxylic functional groups selected from the group consisting of carbonyl groups, carboxyl groups, guinone groups, hydroperoxide groups and lactone groups 1 to 2% of the material surface being occupied by carbon atoms with uncompensated bonds;
• and
• e) a specific surface area in a range of from 200 to 450 gM.sup.2 /g.