A series of tantalum oxynitride ([beta]-TaON) powders was synthesized by thermal ammonolysis of crystalline [Ta.sub.2][O.sub.5] powder (Fluka, 99.9%) in a tubular bed reactor using flowing N[H.sub.3] (Messer, [greater than or equal to] 99.98%) at different temperatures (800, 850, 900, 950, and 1000[degrees]C).
It is well known that [Ta.sub.3][N.sub.5] can be easily formed as a secondary phase, when dry N[H.sub.3] gas is used in the ammonolysis. In this study, it was essential to apply a low flow rate of dry N[H.sub.3] (15-20 mL/min) in order to obtain phase-pure [beta]-TaON phases.
After ammonolysis at 800[degrees]Cand 900[degrees]C, pores were observed on the surface of [beta]-TaON particles and the particle size was reduced compared to the precursor oxide.
Another process, called ammonolysis
, can restore more of the original molecular weight, but it is costlier than the new technology, she said.
was used for the conversion of chromium metalate precursors into ternary nitrides.
of 2 by fusion with ammonium acetate and/or formamide afforded 4-(4-methoxyphenyl)-3,7-dimethyl4,6-dihydro-pyrazolo[4',3' :5,6]pyrano[2,3-d]pyrimidine5(1H)-one 3.
Nylon 6 and/or nylon 6,6 can be converted into a mixture of the respective monomers through an ammonolysis process .
McKinney, who invented the ammonolysis process, further explored the effect of Lewis-acid catalyst precursors on the rate of this process.
for DSM  also involves a method of depolymerizing a polyamide to its monomer in the presence of "at least one nitrogen-containing compound." According to its inventors' claims, this process can produce monomers with a higher selectivity as compared to DuPont's ammonolysis process.