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Auffermann, Gudrun; Prots, Yurii; Kniep, Rüdiger

doi:10.1002/1521-3773(20010202)40:3<469::aid-anie469>3.0.co;2-l

Cited by 14 publications

(17 citation statements)

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“…The Rietveld analysis revealed that the nitrogen dimer distance of marcasite-type NiN 2 at 36.0 GPa is 1.24 Å while it might involve a large uncertainty because of low scattering factor of nitrogen. However, the nitrogen dimer distance of nickel pernitride would be comparable to that of FeN 2 , [14,15] CuN 2 , [16] BaN 2 , [28] and SrN 2 , [29] and the relation between bulk modulus and nitrogen dimer distance inferred from the previous studies is applicable for the nickel pernitride. On the other hand, the bulk modulus might be attributed to not only the state of N-N dimer but also the other factors.…”

Section: Resultsmentioning

confidence: 87%

High‐Pressure Synthesis and Phase Stability of Nickel Pernitride

et al. 2019

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The high‐pressure nitridation of nickel was investigated using a laser‐heated diamond‐anvil cell. Marcasite‐type nickel pernitride (NiN2) was synthesized at approximately 40 GPa, and it transformed into the tetragonal phase at approximately 3 GPa along with the decompression. The structural refinement of marcasite‐type NiN2 at 36 GPa gives an N‐N distance of 1.24 Å. The first‐principles calculation reveals that the marcasite‐type NiN2 is a narrow‐gap semiconductor, and high‐pressure in‐situ X‐ray diffraction measurements revealed a zero‐pressure bulk modulus of 172(6) GPa. The axial ratios (c/a and b/a) of marcasite‐type NiN2 are close to the upper‐limit values of marcasite‐type structures, which suggests that the stability of marcasite‐type transition metal pernitrides strongly depends on the d‐electrons.

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Section: Resultsmentioning

confidence: 87%

High‐Pressure Synthesis and Phase Stability of Nickel Pernitride

et al. 2019

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“…These measurements are in good agreement with the reported value for SrN 2 of 320°C upon heating SrN 2 in vacuum. 10,14 It is noteworthy that all three alkaline earth diazenides react analogously forming the respective subnitrides M AE 2 N upon heating. In the case of strontium and barium diazenide this behavior seems reasonable as the stoichiometric nitrides M AE 3 N 2 do not seem to exist.…”

Section: ■ Introductionmentioning

confidence: 98%

“…Details of the setup are described in the literature. 34−38 CaN 2 (SrN 2 , BaN 2 ) was synthesized in a 14/8 (18/11, 18/11) assembly which was compressed up to 12 (9, 3) GPa at room temperature within 325 (214, 68) minutes, then heated up to 800 (550, 450)°C in 300 (30,30) minutes, kept at this temperature for 20 (15,15) minutes and cooled down to room temperature in 15 (10,10) minutes. Subsequently, the pressure was released over a period of 958 (623, 183) minutes.…”

Section: ■ Introductionmentioning

confidence: 99%

Synthesis of Alkaline Earth Diazenides M_AEN₂(M_AE= Ca, Sr, Ba) by Controlled Thermal Decomposition of Azides under High Pressure

2012

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The alkaline earth diazenides M AE N 2 with M AE = Ca, Sr and Ba were synthesized by a novel synthetic approach, namely, a controlled decomposition of the corresponding azides in a multianvil press at highpressure/high-temperature conditions. The crystal structure of hitherto unknown calcium diazenide (space group I4/mmm (no. 139), a = 3.5747(6) Å, c = 5.9844(9) Å, Z = 2, wR p = 0.078) was solved and refined on the basis of powder X-ray diffraction data as well as that of SrN 2 and BaN 2 . Accordingly, CaN 2 is isotypic with SrN 2 (space group I4/mmm (no. 139), a = 3.8054(2) Å, c = 6.8961(4) Å, Z = 2, wR p = 0.057) and the corresponding alkaline earth acetylenides (M AE C 2 ) crystallizing in a tetragonally distorted NaCl structure type. In accordance with literature data, BaN 2 adopts a more distorted structure in space group C2/c (no. 15) with a = 7.1608(4) Å, b and their remarkable properties (e.g., superconductivity, photoluminescence, magnetism and low compressibility comparable to that of c-BN) 15−24 justify the investigation of the crystalline structure, stability, elasticity and electronic structures of the diazenides. However, except for M = Sr, Ba, Os, Ir, Pd and Pt, no other metal diazenides or pernitrides of formula type MN 2 have been synthesized in crystalline form as yet, but have been predicted by density-functional calculations to form under HP/HT conditions. 24−29 In order to extend the class of nitrogen rich metal diazenides or pernitrides, we have targeted new synthetic approaches for these compounds, and we were successful using controlled decomposition of highly reactive precursors like the corresponding azides. In this contribution, we present our novel synthesis route for the alkaline earth diazenides SrN 2 and BaN 2 . In addition, we report on the synthesis, structural, spectroscopic and electronic characterization of the novel alkaline earth diazenide CaN 2 and compare its structure to the predicted model. 26,29

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“…Sincethepioneeringresearchintobinarynitrides, [1] this field of chemistry has grown into arich diversity of sub-classes. [2][3][4][5][6][7][8][9] One of the families that has been investigated more intensely is that of iron nitrides.S everal different phases are already known, [10] which range from the most iron-rich phases,such as a''-Fe 16 N 2 or a'-Fe 8 Nthrough g'-Fe 4 N, e-Fe 3 N 1AEx and z-Fe 2 Nto g'''-FeN, [11] which represents the most nitrogen-rich phase to date.However,in2011, the existence of nitrogen-richer FeN 2 was predicted. [12] Iron nitrides are used as coatings for steelbased materials combining hardening with protection against corrosion.…”

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confidence: 99%

High‐Pressure NiAs‐Type Modification of FeN

et al. 2017

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The combination of laser‐heated diamond anvil cells and synchrotron Mössbauer source spectroscopy were used to investigate high‐temperature high‐pressure chemical reactions of iron and iron nitride Fe2N with nitrogen. At pressures between 10 and 45 GPa, significant magnetic hyperfine splitting indicated compound formation after annealing at 1300 K. Subsequent in situ X‐ray diffraction reveals a new modification of FeN with NiAs‐type crystal structure, as also rationalized by first‐principles total‐energy and chemical‐bonding studies.

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Cited by 14 publications

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High‐Pressure Synthesis and Phase Stability of Nickel Pernitride

High‐Pressure Synthesis and Phase Stability of Nickel Pernitride

Synthesis of Alkaline Earth Diazenides M_AEN₂(M_AE= Ca, Sr, Ba) by Controlled Thermal Decomposition of Azides under High Pressure

High‐Pressure NiAs‐Type Modification of FeN

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Cited by 14 publications

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High‐Pressure Synthesis and Phase Stability of Nickel Pernitride

High‐Pressure Synthesis and Phase Stability of Nickel Pernitride

Synthesis of Alkaline Earth Diazenides MAEN2(MAE= Ca, Sr, Ba) by Controlled Thermal Decomposition of Azides under High Pressure

High‐Pressure NiAs‐Type Modification of FeN

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Synthesis of Alkaline Earth Diazenides M_AEN₂(M_AE= Ca, Sr, Ba) by Controlled Thermal Decomposition of Azides under High Pressure