Supercritical combustion synthesis of titanium nitride

Synthesis of nanostructured materials in supercritical ammonia: nitrides, metals and oxides

“…12 In addition, synthesis of metal particles by supercritical fluid processing has been equally studied: (i) preparation of nickel, cobalt and iron nanoparticles by chemical reduction of NiCl 2 , CoCl 2 and FeBr 3 , respectively; 13 (ii) copper and silver nanoparticle synthesis in reverse micelles in compressed propane and supercritical ethane solutions; 14,15 (iii) synthesis of silver and copper nanoparticles in a water-insupercritical carbon dioxide microemulsion by chemical reduction of Ag 1 and Cu 21 ; 16 (iv) the reactive supercritical fluid spray fluid processing method for silver nanoparticles elaboration; 17 (v) radiolytically induced synthesis of silver nanoparticles in supercritical ethane; 18 …. Finally, nitride synthesis has been investigated to a lesser extent: (i) the synthesis of TiN in supercritical cryogenic nitrogen by self-propagatinghigh-temperature synthesis (6.21 MPa, 2141 uC); 19 (ii) GaN synthesis by an ammonothermal process (100-500 MPa, 550 uC); 20 (iii) solvothermal synthesis of GaN in supercritical ammonia (100-250 MPa, 400-800 uC); 21 (iv) elaboration of Ni 3 N in supercritical ammonia from Ni(NH 3 ) 6 Cl 2 (NaNH 2 , 250 uC and 200 MPa). 22 In this paper we propose to study the influence of process operating conditions on the control of material nature, and more precisely, on nanostructured nitride elaboration in supercritical ammonia.…”