Ternary ε-Fe3-xMxN1+δ (M=Co,Ni) were synthesized as spherical bulk materials with variable components through composite high-pressure solid-state metathesis (HPSSM) reactions under 5 GPa and at 1673 K, employing diversity binary metal oxides (Fe2O3, CoO, NiO) and hBN as the reaction precursors. The structural characterizations of the as-prepared iron-based metal nitrides were determined by X-ray powder diffraction (XPD), field-emission scanning electronic microscopy (FE-SEM) and high-resolution transmission electron microscope (HRTEM), etc. First-principles calculations were used to explore the effect of pressure on the reaction enthalpy ΔH in HPSSM. Our results show that the high-pressure confinement environment is favorable for the synthesis of high-quality metal nitrides, and the HPSSM reaction is an effective synthetic route to the bulk iron-based metal nitrides.
|Number of pages||6|
|Journal||Gaoya Wuli Xuebao/Chinese Journal of High Pressure Physics|
|Publication status||Published - 2016 Aug 25|
- High-pressure solid-state metathesis reaction (HPSSM)
- Iron-based metal nitride
- Reaction enthalpy