Nitrogen ordering and ferromagnetic properties of ϵ-Fe3N1+x (0.10≤x≤0.39) and ϵ-Fe3(N0.80C0.20)1.38

Leineweber, Andreas; Jacobs, H.; Hüning, Felix; Lueken, Heiko; Kockelmann, W.

doi:10.1016/s0925-8388(00)01435-3

Cited by 108 publications

(101 citation statements)

References 29 publications

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“…[13,18,19,20] Compared to phases of the ε-Fe 3 N phase field with lower nitrogen content, [18,19] these distances become larger and progressively more similar with increasing nitrogen content.…”

Section: Resultsmentioning

confidence: 97%

“…This compares to a = 4.791 Å and c = 4.419 Å for a microcrystalline sample reported with the composition Fe 3 N 1.39 (i.e., 31.7 at % N). [20] The product is completely re-crystallized, and suitable single crystals for X-ray diffraction experiments could be isolated from the product. The refinements of the intensity data led to a composition of Fe 3 N 1.47(1) (32.9 at % N).…”

Section: Resultsmentioning

confidence: 99%

“…For larger x a two-phase region separates the ε-and ζ-phases. [11,20,21] The unit cells of ζ-and ε-type phases show a simple geometric relation according to a ζ ≈ c ε ; b ζ ≈ a ε ϫ 2/Ί3; c ζ ≈ a ε , however, the transition between both crystal structures involves a re-arrangement of nitrogen atoms by diffusion within the host of closed packed iron. The reason for the close proximity of the unit cells (and diffraction patterns) is the fact that in both crystal structures, the ζ-and the ε-type, the ordering of nitrogen is based on the occupation of octahedra in an array of hexagonal close-packed iron atoms.…”

Section: Resultsmentioning

confidence: 99%

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High‐Pressure–High‐Temperature Behavior of ζ‐Fe₂N and Phase Transition to ϵ‐Fe₃N_1.5

et al. 2009

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Under the high‐pressure–high‐temperature conditions of a resistivity‐heated Walker‐type two‐stage multi‐anvil device [1600(200) K and 15(2) GPa] ζ‐Fe2N is transformed to single‐crystalline ϵ‐Fe3N1+x (x = 0.5). The crystal structure was refined in space group P6322 [a = 4.8016(2) Å, c = 4.4269(2) Å, Z = 2, R(F) = 1.27 %] resulting in a composition of Fe3N1.47(1), i.e., under the selected preparation conditions the structural change takes place under conservation of the nitrogen content within experimental error. The applied pressure is necessary to prevent decomposition and formation of elemental nitrogen at elevated temperatures. Application of pressure in a diamond anvil cell at ambient temperature without external heating gives no indication of a phase transition of the starting material. A least‐squares fit of a Murnaghan‐type equation of state to the experimental pressure‐volume data up to 25 GPa results in a compressibility of B0 = 162.1(8) GPa, B0′ = 5.24(8), with V0 = 118.09(1) Å3. Density‐functional electronic‐structure calculations on ζ‐Fe2N and ϵ‐Fe2N for 0 K indicate that no pressure‐induced phase transition can occur such that the phase transition must be driven by temperature, as is observed in the experiments. The bulk module for ζ‐Fe2N (B0 = 219 GPa, B0′ = 4.46 GPa) is in acceptable agreement with the experimental results. Similar to the case of ϵ‐Fe3N1.1, ϵ‐Fe3N1.5 may be described both in space group P312 and P6322, and again space group P312 is favored by 12.1 kJ/mol. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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High‐Pressure–High‐Temperature Behavior of ζ‐Fe₂N and Phase Transition to ϵ‐Fe₃N_1.5

et al. 2009

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“…As such, the peaks could be indexed based on the diffraction patterns of a synthetic alloy -Fe 3 (N 0.80 C 0.20 ) 1.395 which has a Fe/(C+N) ratio 2.15, i.e., similar to the Fe 2 C composition but with a C/(C+N) ratio of 0.20: (001) 0.4406 nm; (100) 0.4135 nm; and (101) 0.3015 nm (Leineweber et al, 2001). The C/N ratio in this synthetic alloy can vary because both carbon and nitrogen are located in the interstitial positions of the lattice (Leineweber et al, 2001). This compound, having a trigonal crystal structure, is called carbonitride and is of great importance to metallurgy.…”

Section: Resultsmentioning

confidence: 99%

Iron Carbide Inclusions in Lower-Mantle Diamond From Juina, Brazil

Kaminsky

Wirth

2011

The Canadian Mineralogist

121

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Iron carbides in association with native iron, graphite, and magnetite were identified in a diamond from the Juina area, Brazil, which contains a series of other, lower-mantle mineral inclusions. Among iron carbides, Fe 3 C, Fe 2 C ("chalypite"), and Fe 23 C 6 (haxonite) are present; the two latter are identified in the terrestrial environment for the first time. Some of the analyzed iron carbide grains contain 7.3-9.1 at.% N and are, in fact, nitrocarbide. It is suggested, based on the high-pressure mineral paragenesis previously observed in the diamond and experimental data on the system Fe-C, that "chalypite" crystallized, within a pressure interval of 50-130 GPa, from an iron-carbon melt, rich in nitrogen. Following crystallization, iron carbides and native iron were partially oxidised to magnetite, and encapsulated in diamond along with other highpressure minerals. The finds of various iron carbides, some of which are rich in nitrogen, in lower-mantle diamond confirm a significant role of carbides and nitrogen in the Earth's interior.

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“…[21] Thermodynamic models indicate an energetic preference of nitrogen ordering rather than statistical distribution. [22,23] However, such an ordering was so far not observed in X-ray single crystal diffraction experiments. [24] The enthalpy of β-Cr 2 N for decomposition into the solid solution and nitrogen was determined to 119 kJ·mol -1 by isobaric decomposition experiments between 1000°C and 1400°C.…”

Section: Introductionmentioning

confidence: 99%

On the Formation Mechanism of Chromium Nitrides: An in situ Study

Widenmeyer

Meissner

Senyshyn

et al. 2014

Zeitschrift anorg allge chemie

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Abstract. Three different synthetic routes to chromium nitrides were investigated using in situ neutron diffraction (SPODI, FRM-II) and thermal analysis in ammonia: (i) The direct conversion of chromium powder in ammonia, (ii) the ammonolysis of chromium(III) chloride CrCl 3 , and (iii) the ammonolysis of chromium(III) sulfide Cr 2 S 3 . During the direct conversion of chromium first γ-CrN was formed above 385°C, above 567°C additionally β-Cr 2 N was detected. Finally, a complete conversion of γ-CrN to β-Cr 2 N was observed at 1080°C. The ammonolysis of chromium(III) compounds (CrCl 3 and Cr 2 S 3 ) revealed a so far in 3d metal nitride synthesis unprecedented redox se-

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Nitrogen ordering and ferromagnetic properties of ϵ-Fe3N1+x (0.10≤x≤0.39) and ϵ-Fe3(N0.80C0.20)1.38

Cited by 108 publications

References 29 publications

High‐Pressure–High‐Temperature Behavior of ζ‐Fe₂N and Phase Transition to ϵ‐Fe₃N_1.5

High‐Pressure–High‐Temperature Behavior of ζ‐Fe₂N and Phase Transition to ϵ‐Fe₃N_1.5

Iron Carbide Inclusions in Lower-Mantle Diamond From Juina, Brazil

On the Formation Mechanism of Chromium Nitrides: An in situ Study

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Nitrogen ordering and ferromagnetic properties of ϵ-Fe3N1+x (0.10≤x≤0.39) and ϵ-Fe3(N0.80C0.20)1.38

Cited by 108 publications

References 29 publications

High‐Pressure–High‐Temperature Behavior of ζ‐Fe2N and Phase Transition to ϵ‐Fe3N1.5

High‐Pressure–High‐Temperature Behavior of ζ‐Fe2N and Phase Transition to ϵ‐Fe3N1.5

Iron Carbide Inclusions in Lower-Mantle Diamond From Juina, Brazil

On the Formation Mechanism of Chromium Nitrides: An in situ Study

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High‐Pressure–High‐Temperature Behavior of ζ‐Fe₂N and Phase Transition to ϵ‐Fe₃N_1.5

High‐Pressure–High‐Temperature Behavior of ζ‐Fe₂N and Phase Transition to ϵ‐Fe₃N_1.5