Preparation of Ammonium Trinitride from Dry Mixtures of Sodium Trinitride and an Ammonium Salt

Frierson, W. J.; Browne, A. W.

doi:10.1021/ja01326a047

Cited by 9 publications

(5 citation statements)

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“…AA powder samples were synthesized by a metathetical reaction of NaN 3 and NH 4 NO 3 , as reported in previous studies [18]. A membrane diamond anvil cell (MDAC) was used to generate high pressures [19], equipped with diamond anvils of culet size of 300 µm.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…AA powder samples were synthesized by a metathetical reaction of NaN

and NH

, as reported in previous studies [ 18 ]. A membrane diamond anvil cell (MDAC) was used to generate high pressures [ 19 ], equipped with diamond anvils of culet size of 300

m. Re gaskets of initial thickness of 200

m were preindented to a thickness of 35

m, and a hole of diameter of 95

m was laser-drilled at the center of the indent in order to serve as the sample chamber.…”

Section: Materials and Methodsmentioning

confidence: 99%

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Transformation of Ammonium Azide at High Pressure and Temperature

Zhang

Ninet

et al. 2020

Materials

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The compression of ammonium azide (AA) has been considered to be a promising route for producing high energy-density polynitrogen compounds. So far though, there is no experimental evidence that pure AA can be transformed into polynitrogen materials under high pressure at room temperature. We report here on high pressure (P) and temperature (T) experiments on AA embedded in N2 and on pure AA in the range 0–30 GPa, 300–700 K. The decomposition of AA into N2 and NH3 was observed in liquid N2 around 15 GPa–700 K. For pressures above 20 GPa, our results show that AA in N2 transforms into a new crystalline compound and solid ammonia when heated above 620 K. This compound is stable at room temperature and on decompression down to at least 7.0 GPa. Pure AA also transforms into a new compound at similar P–T conditions, but the product is different. The newly observed phases are studied by Raman spectroscopy and X-ray diffraction and compared to nitrogen and hydronitrogen compounds that have been predicted in the literature. While there is no exact match with any of them, similar vibrational features are found between the product that was obtained in AA + N2 with a polymeric compound of N9H formula.

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Section: Experimental Methodsmentioning

confidence: 99%

“…AA powder samples were synthesized by a metathetical reaction of NaN

and NH

, as reported in previous studies [ 18 ]. A membrane diamond anvil cell (MDAC) was used to generate high pressures [ 19 ], equipped with diamond anvils of culet size of 300

m. Re gaskets of initial thickness of 200

m were preindented to a thickness of 35

m, and a hole of diameter of 95

m was laser-drilled at the center of the indent in order to serve as the sample chamber.…”

Section: Materials and Methodsmentioning

confidence: 99%

Transformation of Ammonium Azide at High Pressure and Temperature

Zhang

Ninet

et al. 2020

Materials

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“…The NH 4 N 3 powder samples were synthesized by a metathetical reaction of NaN 3 and NH 4 NO 3 as reported in the literature . The synthesized sample is a colorless and transparent polycrystalline powder.…”

Section: Methodsmentioning

confidence: 99%

Crystal Structure and Stability of Ammonium Azide Under High Pressure

Zhang

Ninet

et al. 2019

J. Phys. Chem. C

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Due to its potential applications as a high-energy density material, the high-pressure polymorphs of ammonium azide (AA) have received much attention recently. However, the crystal structure of phase Ⅱ (AA-II), stable above 3.0 GPa, has remained elusive until now. By combining X-ray diffraction and Raman experiments with first principle calculations, we determine that AA-II is a hydrogen(H)-bonded structure of ammonium and azide ions with monoclinic symmetry, space group P2/c. The latter is comprised of alternating molecular layers of ammonium and azide ions and mostly differs from AA-I by its denser packing of molecular planes while preserving the hydrogen bond network. First-principle calculations show that phase Ⅱ has the lowest enthalpy among all other considered structures from 4.9 to 102.6 GPa, pushing the phase transitions to the previously predicted hydro-nitrogen solids to higher pressures. Raman data to 85.0 GPa at room temperature confirm the absence of phase transition and agree very well with the pressure evolution of the Raman modes of AA-II predicted by our calculations.

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“…At ambient condition, the ground-state hydronitrogen is well known to adopt the ammonia phase consisting of NH 3 molecules. Under specific conditions some metastable phases can be synthesized, including hydrazine (N 2 H 4 ), 17 diazene (N 2 H 2 ), 18 ammonium azide (NH 4 N 3 ), 19 tetrazene (N 4 H 4 ) 20 and hydrogen azide (HN 3 ), 21 etc. The diversity of these metastable phases implies the versatile capability of hydrogen in stabilizing a wide range of compounds with the lower order N-N bonds.…”

Section: Introductionmentioning

confidence: 99%

N₂H: a novel polymeric hydronitrogen as a high energy density material

et al. 2015

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ABSTRACT:The polymeric phase of nitrogen connected by the lower (than three) order N-N bonds has been long sought after for the potential application as high energy density materials. Here we report a hitherto unknown polymeric N 2 H phase discovered in the high-pressure hydronitrogen system by first-principle structure search method based on particle swarm optimization algorithm. This polymeric hydronitrogen consists of quasi-one-dimensional infinite armchair-like polymeric N chains, where H atoms bond with two adjacent N located at one side of armchair edge. It is energetically stable against decomposition above ~33 GPa, and shows novel metallic feature as the result of pressure-enhanced charge transfer and delocalization of π electrons within the infinite nitrogen chains. The high energy density (~4.40 KJ/g), high nitrogen content (96.6%), as well as relatively low stabilization pressure, make it a possible candidate for high energy density applications. It also has lattice dynamical stability down to the ambient pressure, allowing for the possibility of kinetic stability with respect to variations of external conditions. Experimental synthesis of this novel phase is called for.

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Preparation of Ammonium Trinitride from Dry Mixtures of Sodium Trinitride and an Ammonium Salt

Cited by 9 publications

References 0 publications

Transformation of Ammonium Azide at High Pressure and Temperature

Transformation of Ammonium Azide at High Pressure and Temperature

Crystal Structure and Stability of Ammonium Azide Under High Pressure

N₂H: a novel polymeric hydronitrogen as a high energy density material

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Preparation of Ammonium Trinitride from Dry Mixtures of Sodium Trinitride and an Ammonium Salt

Cited by 9 publications

References 0 publications

Transformation of Ammonium Azide at High Pressure and Temperature

Transformation of Ammonium Azide at High Pressure and Temperature

Crystal Structure and Stability of Ammonium Azide Under High Pressure

N2H: a novel polymeric hydronitrogen as a high energy density material

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Product

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N₂H: a novel polymeric hydronitrogen as a high energy density material