Abstract
The iron manganese nitride Fe2MnN was obtained by high-pressure–high-temperature synthesis from ζ-Fe2N and elemental Mn at 15(2) GPa and 1573(200) K. The phase crystallizes isostructural to binary ε-Fe3N. In comparison to the corresponding binary iron nitride, the microhardness of ε-Fe2MnN is reduced to 6.2(2) GPa. Above about 800 K the ternary compound decomposes exothermally under loss of nitrogen. ε-Fe2MnN is ferromagnetic with a Curie temperature of roughly 402 K.
Highlights
During recent years, high-manganese austenitic steels have been regarded an object of fundamental interest for applications in the field of advanced construction materials, because of their exceptional mechanical properties with regard to strain and strength leading to an excellent balance between flow stresses and ductility [1,2,3,4]
We recently developed a highdeveloped a high-pressure–high-temperature synthesis strategy to access such metastable materials, pressure–high-temperature synthesis strategy to access such metastable materials, which which successfully yielded the ternary compounds Fe2 CoN, Fe2 NiN and Fe2 IrN0.24 [43,44]
Manganese powdersthe were obtained by passed grinding bulk high-pressure–high-temperature synthesis, a mixture ζ-Fe2 Nwhich and Mn powders
Summary
High-manganese austenitic steels have been regarded an object of fundamental interest for applications in the field of advanced construction materials, because of their exceptional mechanical properties with regard to strain and strength leading to an excellent balance between flow stresses and ductility [1,2,3,4]. In the idealized crystal structure of ε-Fe3 N, nitrogen atoms occupy one third of the octahedral holes of the hcp of iron (basically a ε-Fe-type array) in an ordered. For samples with compositions close to the ideal Fe3 N some entropy-driven transfer of nitrogen from. Even for samples with compositions close to the ideal Fe3N some entropy-driven transfer the ideal position to those additional octahedral holes is observed, depending on temperature and of nitrogen from the ideal position to those additional octahedral holes is observed, depending on thermal history of the sample [12,24,27].
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