Raman scattering in alkali azides at high pressures

Christoe, C. W.; Iqbal, Zafar

doi:10.1016/0009-2614(76)80317-x

Cited by 18 publications

(12 citation statements)

References 12 publications

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“…Raman scattering up to 4.0 GPa17 and single-crystal x-ray diffraction up to 7.0 GPa18 show that no phase transition is found at these measured pressures. Recently, a structural phase transition at 15.5 GPa is revealed by X-ray diffraction study910.…”

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confidence: 84%

Pressure-induced planar N6 rings in potassium azide

Zhang

Lin

et al. 2014

Sci Rep

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The first-principles method and the evolutionary algorithm are used to identify stable high pressure phases of potassium azide (KN3). It has been verified that the stable phase with space group I4/mcm below 22 GPa, which is consistent with the experimental result, will transform into the C2/m phase with pressure increasing. These two phases are insulator with anions. A metallic phase with P6/mmm symmetry is preferred above 40 GPa, and the N atoms in this structure form six-membered rings which are important for understanding the pressure effect on anions and phase transitions of KN3. Above the studied pressure (100 GPa), a polymerization of N6 rings may be obtained as the result of the increasing compactness.

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confidence: 84%

Pressure-induced planar N6 rings in potassium azide

Zhang

Lin

et al. 2014

Sci Rep

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“…5,6 Previous studies indicated that inorganic azides undergo a variety of phase transitions, accompanied by the lattice distortion and reorientation of linear azide anions (N 3 À ) during the temperature or pressure induced phase transitions. [7][8][9][10][11][12][13] High-pressure study on inorganic azides has become an interest topic due to the polymerization of azide anions (N 3 À ) can form a high energy density material under high pressure. Polymerization of nitrogen net is pioneered by studies of nitrogen, a phenomenon which was first predicted in 1985 14 and recently achieved.…”

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confidence: 99%

High pressure synchrotron x-ray diffraction and Raman scattering studies of ammonium azide

Cui

Zhang

et al. 2013

Applied Physics Letters

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“…As the pressure increased by a small value, the intensity of L R1 -L R4 modes exhibited significantly enhanced and the intensity of T(E g ) and R(E g ) modes also completely depleted at 6.7 GPa suggesting the completion of the first phase transition at this pressure. The sizable softening of the T(E g ) modes has been predicted to trigger a phase transition when the pressure greater than 4GPa, 23 which has been proved in this work. In addition, the softening of the T(E g ) modes upon pressure is also observed in KN 3 and TlN 3 , iso-structural with RbN 3 at ambient conditions.…”

Section: B Raman Spectra Upon Compressionmentioning

confidence: 85%

“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 5 studies up to pressure of 4GPa. 23,24 It is therefore rather significant to investigate the high-pressure vibrational spectroscopic behaviors of RbN 3 by optical spectroscopic method.…”

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confidence: 99%

High-Pressure Studies of Rubidium Azide by Raman and Infrared Spectroscopies

et al. 2015

J. Phys. Chem. C

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We report the high-pressure studies of RbN 3 by Raman and IR spectral measurements at room temperature with the pressure up to 28.5 GPa and 30.2 GPa, respectively. All the fundamental vibrational modes were resolved by combination of experiment and calculation. Detailed spectroscopic analyses reveal two phase transitions at ~ 6.5 and ~16.0 GPa, respectively. Upon compression, the shearing distortion of the unit cell induced the displacive structural transition of phase α → γ.Further analyses of the mid-IR spectra indicate the evolution of N 3 − with the arrangement sequence of orthogonal → parallel → orthogonal during the phase transition of phase α → γ → δ. Additionally, the pressure-induced non-linear/asymmetric existence of N=N=N and the two crystallographically nonequivalent sites of N 3 − were observed in phase δ.

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Raman scattering in alkali azides at high pressures

Cited by 18 publications

References 12 publications

Pressure-induced planar N6 rings in potassium azide

Pressure-induced planar N6 rings in potassium azide

High pressure synchrotron x-ray diffraction and Raman scattering studies of ammonium azide

High-Pressure Studies of Rubidium Azide by Raman and Infrared Spectroscopies

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