scholarly journals New pathways to iron nitride soft magnets.

2020 ◽  
Author(s):  
Todd Monson ◽  
Tyler Stevens ◽  
Charles Pearce ◽  
Melinda Hoyt ◽  
Erika Vreeland ◽  
...  
Keyword(s):  
Iron Nitride ◽  
Soft Magnets

NixFeyN@C microsheet arrays on Ni foam as an efficient and durable electrocatalyst for electrolytic splitting of alkaline seawater

2021 ◽  
Author(s):  
Boran Wang ◽  
Mengjie Lu ◽  
Duo Chen ◽  
Qi Zhang ◽  
Wenwen Wang ◽  
...  
Keyword(s):  
Iron Nitride ◽  
Ni Foam ◽  
Nickel Iron ◽  
Porous Architecture

A self-supported nickel-iron nitride microsheet arrays coated with carbon is grown on commercial Ni foam (NixFeyN@C/NF) and used as electrocatalyst for splitting of seawater. The porous architecture and superhydrophilic/superaerophobic surface...

scholarly journals Phase Stability of Iron Nitride Fe4N at High Pressure—Pressure-Dependent Evolution of Phase Equilibria in the Fe–N System

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3963
Author(s):  
Marius Holger Wetzel ◽  
Tina Trixy Rabending ◽  
Martin Friák ◽  
Monika Všianská ◽  
Mojmír Šob ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Equilibria ◽  
Phase Stability ◽  
Polymorphic Transition ◽  
Ex Situ ◽  
Stable Phase ◽  
Iron Nitride ◽  
Phase System ◽  
Target Composition ◽  
Heat Treated

Although the general instability of the iron nitride γ′-Fe4N with respect to other phases at high pressure is well established, the actual type of phase transitions and equilibrium conditions of their occurrence are, as of yet, poorly investigated. In the present study, samples of γ′-Fe4N and mixtures of α Fe and γ′-Fe4N powders have been heat-treated at temperatures between 250 and 1000 °C and pressures between 2 and 8 GPa in a multi-anvil press, in order to investigate phase equilibria involving the γ′ phase. Samples heat-treated at high-pressure conditions, were quenched, subsequently decompressed, and then analysed ex situ. Microstructure analysis is used to derive implications on the phase transformations during the heat treatments. Further, it is confirmed that the Fe–N phases in the target composition range are quenchable. Thus, phase proportions and chemical composition of the phases, determined from ex situ X-ray diffraction data, allowed conclusions about the phase equilibria at high-pressure conditions. Further, evidence for the low-temperature eutectoid decomposition γ′→α+ε′ is presented for the first time. From the observed equilibria, a P–T projection of the univariant equilibria in the Fe-rich portion of the Fe–N system is derived, which features a quadruple point at 5 GPa and 375 °C, above which γ′-Fe4N is thermodynamically unstable. The experimental work is supplemented by ab initio calculations in order to discuss the relative phase stability and energy landscape in the Fe–N system, from the ground state to conditions accessible in the multi-anvil experiments. It is concluded that γ′-Fe4N, which is unstable with respect to other phases at 0 K (at any pressure), has to be entropically stabilised in order to occur as stable phase system. In view of the frequently reported metastable retention of the γ′ phase during room temperature compression experiments, energetic and kinetic aspects of the polymorphic transition γ′⇌ε′ are discussed.

scholarly journals Magnetic properties of iron nitride-alumina nanocomposite materials prepared by high-energy ball milling

2003 ◽  
Vol 24 (1-3) ◽  
pp. 93-96 ◽  
Author(s):  
S. R. Mishra ◽  
G. J. Long ◽  
F. Grandjean ◽  
R. P. Hermann ◽  
S. Roy ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ball Milling ◽  
High Energy ◽  
Nanocomposite Materials ◽  
High Energy Ball Milling ◽  
Iron Nitride ◽  
Energy Ball

scholarly journals Metal Organic Frameworks Derived Fe-N-C Nanostructures as High-Performance Electrodes for Sodium Ion Batteries and Electromagnetic Interference (EMI) Shielding

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1018
Author(s):  
Vadahanambi Sridhar ◽  
Inwon Lee ◽  
Hyun Park
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Electromagnetic Interference ◽  
Sodium Ion ◽  
Iron Nitride ◽  
Sodium Ion Batteries ◽  
Nitrogen Doped ◽  
Wide Range ◽  
Metal Organic ◽  
Nitrogen Doped Carbon

Metal organic framework (MOF)-derived carbon nanostructures (MDC) synthesized by either calcinations or carbonization or pyrolysis are emerging as attractive materials for a wide range of applications like batteries, super-capacitors, sensors, water treatment, etc. But the process of transformation of MOFs into MDCs is time-consuming, with reactions requiring inert atmospheres and reaction time typically running into hours. In this manuscript, we report the transformation of 1,4-diazabicyclo[2.2.2]octane, (DABCO)-based MOFs into iron nitride nanoparticles embedded in nitrogen-doped carbon nanotubes by simple, fast and facile microwave pyrolysis. By using graphene oxide and carbon fiber as microwave susceptible surfaces, three-dimensional nitrogen-doped carbon nanotubes vertically grown on reduced graphene oxide (MDNCNT@rGO) and carbon fibers (MDCNT@CF), respectively, were obtained, whose utility as anode material in sodium-ion batteries (MDNCNT@rGO) and for EMI (electromagnetic interference) shielding material (MDCNT@CF) is reported.

Formation of nanometer magnetic iron nitride film by IBED

1997 ◽  
Vol 96 (1) ◽  
pp. 34-38 ◽  
Author(s):  
Li Guibin ◽  
Li Guoqing ◽  
Lei Minkai ◽  
Liu Bangzhi
Keyword(s):  
Iron Nitride ◽  
Nitride Film ◽  
Iron Nitride Film

Low-Temperature Approach to Synthesize Iron Nitride from Amorphous Iron

2008 ◽  
Vol 47 (4) ◽  
pp. 1261-1263 ◽  
Author(s):  
Yi Han ◽  
Huamin Wang ◽  
Minghui Zhang ◽  
Ming Su ◽  
Wei Li ◽  
...  
Keyword(s):  
Low Temperature ◽  
Iron Nitride ◽  
Amorphous Iron

Continuous phase evolution of iron nitride epitaxial films based on structural commonality

2019 ◽  
Vol 789 ◽  
pp. 730-735 ◽  
Author(s):  
Li-Yong Yuan ◽  
Li Ma ◽  
Wei He ◽  
Hong-Ye Wu ◽  
Yun-Bin Sun ◽  
...  
Keyword(s):  
Phase Evolution ◽  
Continuous Phase ◽  
Epitaxial Films ◽  
Iron Nitride ◽  
Structural Commonality
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