Lattice dynamics and phase transition in sodium azidea)

Kanney, L. B.; Gillis, N. S.; Raich, J. C.

doi:10.1063/1.434544

Cited by 12 publications

(9 citation statements)

References 9 publications

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“…As the schematic diagram shown in figure 4(b), compression leads to the shearing distortion of Na-layers parallel to ab plane and rotation of azide ions perpendicular to ab plane as the arrows shown, which, consequently, result in the structural phase transition from rhombohedral to monoclinic structure. The phase transformation mechanism was also well established in previous works about NaN 3 [26,30,31]. Additionally, the rotation process may also be accompanied with tilting of the azide ions.…”

Section: The Raman Spectra At High Pressuresupporting

confidence: 63%

“…During last century, a series of attempts have been conducted to exploring the stability, lattice dynamics, electronic structure, and optical properties of NaN 3 , while the pressure was restricted to 4.0 GPa [28]. As reported that application of pressure below 1.0 GPa or temperature near 20°C can initiate a phase transition from rhombohedral to monoclinic structure (α-NaN 3 ), accompanied by the shearing of the Na-layers and the tilting of the azide chains [14,25,26,[28][29][30][31]. Recently, Eremets et al revealed two pressure-induced phase transitions of NaN 3 at 19.0 and 50.0 GPa respectively [32].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: The Raman Spectra At High Pressuresupporting

confidence: 63%

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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“…In the temperatureinduced tetragonal-cubic phase transitions of both rubidium azide (RbN 3 ) and cesium azide (CsN 3 ), a fluctuation of the orientation of N 3 À anions was observed. [16][17][18] In both the temperature- 15 and pressure-induced [23][24][25] rhombohedral-monoclinic phase transition of sodium azide (NaN 3 ), a tilting of N 3 À anions was also observed. High-pressure studies on metal azides are of special interest recently because of their use as a precursor to form a highly energetic polymeric (non-molecular) form of nitrogen (N 2 ).…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14] Metal azides undergo a variety of pressure or temperatureinduced phase transitions, a phenomenon which has been intensively studied. [14][15][16][17][18][19][20][21][22][23][24][25] The behavior of the azide anions (N 3 À ) during the phase transition is noticeable. In the temperatureinduced tetragonal-cubic phase transitions of both rubidium azide (RbN 3 ) and cesium azide (CsN 3 ), a fluctuation of the orientation of N 3 À anions was observed.…”

Section: Introductionmentioning

confidence: 99%

Phase transition and structure of silver azide at high pressure

Hou

Zhang

et al. 2011

Journal of Applied Physics

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Abstractilver azide (AgN 3 ) was compressed up to 51.3 GPa. The results reveal a reversible second-order orthorhombic-to-tetragonal phase transformation starting from ambient pressure and completing at 2.7 GPa. The phase transition is accompanied by a proximity of cell parameters aand b, a 3° rotation of azide anions, and a change of coordination number from 4-4 (four short, four long) to eight fold. The crystal structure of the high pressure phase is determined to be inI4/mcm space group, with Ag at 4a, N 1 at 4d, and N 2 at 8h Wyckoff positions. Both of the two phases have anisotropic compressibility: the orthorhombic phase exhibits an anomalous expansion under compression along a-axis and is more compressive along b-axis than c-axis; the tetragonal phase is more compressive along the interlayer direction than the intralayer directions. The bulk moduli of the orthorhombic and tetragonal phases are determined to be K OT = 39 ± 5 GPa with K OT ' = 10 ± 7 and K OT = 57 ± 2 GPa with K OT ' = 6.6 ± 0.2, respectively. KeywordsMechanical Engineering, Materials Science and Engineering, High pressure, Phase transitions, Active galaxies, Silver, Equations of state, X-ray diffraction, Polymers, Anisotropy, Elastic moduli, Magmatic magnetic minerals Disciplines Aerospace Engineering | Materials Science and Engineering | Mechanical Engineering CommentsThe following article appeared in Journal of Applied Physics 110 (2011) Silver azide (AgN 3 ) was compressed up to 51.3 GPa. The results reveal a reversible second-order orthorhombic-to-tetragonal phase transformation starting from ambient pressure and completing at 2.7 GPa. The phase transition is accompanied by a proximity of cell parameters a and b, a 3 rotation of azide anions, and a change of coordination number from 4-4 (four short, four long) to eight fold. The crystal structure of the high pressure phase is determined to be in I4/mcm space group, with Ag at 4a, N 1 at 4d, and N 2 at 8h Wyckoff positions. Both of the two phases have anisotropic compressibility: the orthorhombic phase exhibits an anomalous expansion under compression along a-axis and is more compressive along b-axis than c-axis; the tetragonal phase is more compressive along the interlayer direction than the intralayer directions. The bulk moduli of the orthorhombic and tetragonal phases are determined to be K OT ¼ 39 6 5 GPa with K OT ' ¼ 10 6 7 and K OT ¼ 57 6 2 GPa with K OT ' ¼ 6.6 6 0.2, respectively.

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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%