High pressure X-ray diffraction study of potassium azide

Ji, Cheng; Zhang, Fuxiang; Hou, Dongbin; Zhu, Hongyang; Wu, Jianzhe; Chyu, Ming‐Chien; Levitas, Valery I.; Ma, Yanzhang

doi:10.1016/j.jpcs.2011.03.005

Cited by 58 publications

(42 citation statements)

References 20 publications

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“…This may imply that the atomic fractional coordinates of Phase IV have little change with increasing pressure, which infers that the azide anions of Phase IV keep almost the same orientation during compression. A comparison of the properties and phase transition pressures of alkali azides are given in Table III 9,14,26,39 . Therefore it can be concluded that the ionic character of the compounds plays a key role in the pressure-induced phase transitions of alkali azides (more specifically, the phase transitions are favored by a stronger ionic character of the compounds).…”

Section: Resultsmentioning

confidence: 99%

Series of phase transitions in cesium azide under high pressure studied byin situx-ray diffraction

Hou

Zhang

et al. 2011

Phys. Rev. B

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In situ X-ray diffraction measurements of cesium azide (CsN 3) were performed at high pressures up to 55.4 GPa at room temperature. Three phase transitions were revealed as follows: tetragonal (I4/mcm, Phase II) → monoclinic (C2/m, Phase III) → monoclinic (P2 1 /m or P2 1 , Phase IV) → triclinic (P1 or P 1 , Phase V), at 0.5 GPa, 4.4 GPa, and 15.4 GPa, respectively. During the II-III phase transition, CsN 3 keeps its layered structure; and the azide anions rotate obviously. The compressibility of Phase II is dominated by the repulsions between azide anions. The deformation of unit cell is isotropic in Phase II and IV, and anisotropic in Phase III. With increasing pressures, the monoclinic angle increases in Phase III and then becomes stable in Phase IV. The bulk moduli of Phase II, III, IV, and V are determined to be 18 ± 4 GPa, 20 ± 1 GPa, 27 ± 1 GPa and 34 ± 1 GPa, respectively. The ionic character of alkali azides is found to play a key role in their pressure-induced phase transitions.

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Section: Resultsmentioning

confidence: 99%

Series of phase transitions in cesium azide under high pressure studied byin situx-ray diffraction

Hou

Zhang

et al. 2011

Phys. Rev. B

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“…Alkali azides are ideal precursor for synthesizing the polymeric nitrogen due to their more stable characteristic compared to heavy metal azides and covalent azides. In recent discoveries, we have extensively attempts at exploring the high-pressure structural stability, electronic structure, and evolution of azide ions of these azides [12][13][14][15][16][17]. A series of pressure-induced phase transitions were observed in these substances and the interlayered shearing of unit cell and rotation of azide ions were revealed as the pressure below 30.0 GPa [12][13][14][15]17].…”

Section: Introductionmentioning

confidence: 99%

“…In recent discoveries, we have extensively attempts at exploring the high-pressure structural stability, electronic structure, and evolution of azide ions of these azides [12][13][14][15][16][17]. A series of pressure-induced phase transitions were observed in these substances and the interlayered shearing of unit cell and rotation of azide ions were revealed as the pressure below 30.0 GPa [12][13][14][15]17]. With increasing pressure, the azide ions were found to transform into chain like or ring structures then polymeric nitrogen nets [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effect of pressure on sodium azide studied by spectroscopic method

Zhu

Jiang

et al. 2017

J. Phys. Commun.

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The high-pressure Raman and IR measurements of NaN 3 were performed at room temperature with pressure up to 35.0 and 26.0 GPa, respectively. Three phase transitions of β-NaN 3 →α-NaN 3 →γ-NaN 3 →δ-NaN 3 were revealed at 0.5, 14.0, and 27.6 GPa. All fundamental vibrational modes were analyzed based on experimental and theoretical methods. The phase transition from β-NaN 3 to α-NaN 3 is attributed to the shearing distortion of unit cell and the rotation of the azide ions with increasing pressure. The abnormal symmetric evolution of bending modes observed in IR measurements reveals the rotational behavior of azide groups upon compression. Moreover, the azide ions might evolve into an energetically favorable arrangement under a higher pressure.

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“…However, X-ray illumination can cause radiation damage in inorganic azides, affecting the results of X-ray diffraction studies. 12,25 Therefore, it is of interest to investigate the a)…”

Section: Introductionmentioning

confidence: 99%

Phase transitions of cesium azide at pressures up to 30 GPa studied using in situ Raman spectroscopy

Medvedev

Barkalov

Naumov

et al. 2015

Journal of Applied Physics

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Cesium azide has been studied by Raman spectroscopy at pressures up to %30 GPa at room temperature. The sequence of phase transitions to Phase III (at 0.5 GPa), Phase IV (at 4.3 GPa), and Phase V (at %19 GPa) has been observed in agreement with recent X-ray diffraction studies. Phase III has been found to adopt a monoclinic C2/m structure with two azide anions in nonequivalent positions, where one set of azide anions appears to be orientationally disordered according to the observed Raman spectra. The transition to Phase IV has been associated with orientational ordering of azide anions, while the transition to Phase V has been shown to proceed with a lowering of crystal symmetry. Moreover, spectroscopic features indicate a possible change of bonding in CsN 3 toward formation of covalent bonds at high pressures. V

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High pressure X-ray diffraction study of potassium azide

Cited by 58 publications

References 20 publications

Series of phase transitions in cesium azide under high pressure studied byin situx-ray diffraction

Series of phase transitions in cesium azide under high pressure studied byin situx-ray diffraction

Effect of pressure on sodium azide studied by spectroscopic method

Phase transitions of cesium azide at pressures up to 30 GPa studied using in situ Raman spectroscopy

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