We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Synthesis of Metastable Co<sub>4</sub>N, Co<sub>3</sub>N, Co<sub>2</sub>N, and CoO<sub>0.74</sub>N<sub>0.24</sub> from a Single Azide Precursor and Intermediates in CoBr<sub>2</sub> Ammonolysis.
- Authors
Widenmeyer, Marc; Shlyk, Larysa; Becker, Nils; Dronskowski, Richard; Meissner, Elke; Niewa, Rainer
- Abstract
Metastable cobalt nitrides Co4N, Co3N, Co2N, and cobalt oxide nitride CoO0.74N0.24 were synthesized by ammonolysis of one single metastable azide precursor, [Co(NH3)5N3]Cl2, in high purity by controlled variation of the reaction conditions (temperature, duration, gas atmosphere, and flow rate). The alternative route towards cobalt nitrides by ammonolysis of CoBr2 proceeds via [Co(NH3)6]Br2 and Co(NH3)2Br2 to exclusively yield Co3N. For Co3N1.1 a complex magnetic behavior is observed: dominating ferromagnetic ordering at low temperatures and a small coercive field of 10 mT. Co2N orders antiferromagnetically below 10 K. Electronic structure calculations [DFT, generalized-gradient approximation (GGA)+ U] on CoO0.75N0.25 reveal that the experimentally observed rock-salt structure is less stable than the sphalerite-type polymorph by about 30 kJ mol-1 and possesses an antiferromagnetically ordered ground state.
- Subjects
COBALT compounds synthesis; NITRIDES; AMMONOLYSIS; AZIDES; CHEMICAL precursors; COBALT bromide; COBALT oxides; METASTABLE states
- Publication
European Journal of Inorganic Chemistry, 2016, Vol 2016, Issue 29, p4792
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.201600684