X. Gouin et al., A NEW FAMILY OF HIGH SPECIFIC SURFACE-ARE A CHROMIUM OXYNITRIDES - PREPARATION AND CHARACTERIZATION, Annales de chimie, 20(5), 1995, pp. 293-299
A new family of high specific surface area chromium oxynitrides : Prep
aration and characterization. High specific surface area chromium oxyn
itride powders (Sg > 100 m(2).g(-1)) have been synthesized from a reac
tive chromium hydroxide precursor prepared by precipitation in hydroal
coholic medium. The nitridation of the precursor at low temperatures i
n flowing ammonia leads to a series of NaCl type chromium oxynitrides
without any crystallization of alpha-Cr2O3. The composition, the state
of crystallization and the Sg values of the nitrided phases closely d
epend on the nitridation temperature and time.