Chemical environment of iron atoms in iron oxynitride films synthesized by reactive magnetron sputtering

Structural investigations of iron oxynitride multilayered films obtained by reactive gas pulsing process

“…Thus, questions about the oxygen-nitrogen distribution, ordering and stoichiometry are difficult to solve with X-ray diffraction technique. The comparison of the films deposited in the present study with those synthesized using a non-pulsing process (deposition conditions: Q(N 2 ) = 2 sccm and Q(O 2 ) = 0.4 sccm [16,30]), clearly evidence that they crystallize in the same structure. Hence, the hypothesis of a mixture of iron nitride with wüstite (γ″′-FeN/FeO) cannot be excluded because of the presence of a diffraction peak with low intensity at approx.…”

“…Fig. 8 shows the spectra obtained from the films prepared with τ mou = − 10 s and changing t on from 10 to 30 s. All the films show a paramagnetic spectrum at room temperature, which is similar to that of the iron oxynitride phase [30].…”

“…The nitrogen-rich phases of iron nitride such as γ″-FeN, and γ″′-FeN are paramagnetic at room temperature [42,44]. Based on previous paper [30] on the chemical environment of iron atoms in iron oxynitride films, the origin of the remaining components, quadrupolar doublets (D1, D2 and D3) can be associated with iron in the non-stoichiometric NaCl-type structure with vacancies or by substitution of oxygen in the nitrogen sublattice. It should be emphasized that TEM results are consistent with a multilayer structure for all the films.…”

Low-Temperature Nitridation of Fe3O4 by Reaction with NaNH2

“…Indeed, the determined unit cell parameter is intermediate between that of wustite Fe 1– x O ( a = 4.28–4.31 Å) and γ‴-FeN ( a = 4.50 Å), − consistent with such a solid solution. Hitherto, iron oxynitrides, of the type FeO 1– x N x , have been reported only as thin films produced by magnetron sputtering or molecular beam epitaxy and exhibit unstrained unit cell parameters in the range 4.25 Å < a < 4.52 Å depending on composition (with (N + O)/Fe ≈ 1.0 and 0.13 < N/(N + O) < 0.65), consistent with our determined unit cell parameter. − Analysis of 57 Fe Mössbauer data also established the presence of minor γ″-FeN, adopting the zinc blende structure and a = 4.31 Å . This phase would also make a minor contribution to the broad Bragg reflections of the face-centered cubic phase indexed in Figure , based on the estimated phase fraction derived from 57 Fe Mössbauer data.…”

Electrical discharge process for rapid oxycarburisation of titanium in air

“…11,12 Other more recent examples include the so called multifunctional coating systems, where the oxynitrides, MeO x N y , and oxycarbides, MeC x O y (where Me stands for transition metal) have been attracting particular interest. [13][14][15][16][17][18][19][20] For many years, surface modification processes based on the thermo-diffusion mechanism have been widely used to improve the properties of Ti and Ti based alloys. However, for example, conventional thermal processes have several disadvantages such as long processing times, poor surface finish, poor control of the coating layer formation, etc.…”