Effect of pressure on the structure of Fe–N alloys formed by solid-state reaction

Abstract

Fe–N alloys with crystalline structures different from those obtained at atmospheric pressure were produced by solid-state reaction between Fe and amorphous boron nitride under high pressure. Two new paramagnetic Fe–N phases were obtained at temperatures above 800 K under pressures between 2.0 and 4.0 GPa. One is of cubic structure with lattice constant of 6.114 Å, and another is of orthorhombic structure with lattice constants of a = 4 8.443, b = 4 4.749, and c 4 3.993 Å. ε–Fe3Nx with N contents of 18.1 to 21.4 at.%, which could not be obtained at atmospheric pressure, was produced at pressures of 3.0 to 4.0 GPa and temperatures of 690 to 800 K. The mechanism of formation of ε–Fe3Nx under high pressure is discussed.

Formation of titanium nitride by mechanical milling and isothermal annealing of titanium and boron nitride

“…Therefore, it is favorable thermodynamically and kinetically for Ti to react with N from the a-BN to form ␦-TiN x during mechanical milling or annealing of the mixture of Ti and BN. A similar result was found in the preparation of Fe-N alloy by mechanical milling or annealing of the mixture of Fe and BN [12].…”

Characterization of structure and properties of TiN–TiB2 nano-composite prepared by ball milling and high pressure heat treatment

“…Hence, Ti atoms react more easily with N than B atoms. Similar result was found in preparation of Fe-N alloy by mechanical milling or annealing of the mixture of Fe and BN [14]. The emergence and intensification of the peaks of TiB 2 as shown in Fig.…”

Effects of degree of three-dimensional order and Fe impurities on photoluminescence of boron nitride

“…In addition, ␣-Fe diffraction peaks and a peak at diffraction angle 2 = 43.17°corresponding to the ͑101͒ diffraction peak of FeN 0.089 with a tetragonal structure. 25,26 When annealed at 1200°C, XRD peak intensities of ␣-Fe decreased greatly whereas the XRD peak of the FeN 0.089 disappeared. 2.…”