Pressure-induced phase transitions in rubidium azide: Studied by in-situ x-ray diffraction

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

“…This phenomenon is consistent with our previous conclusion that the rotation of the N 3 − is rearranged as orthogonal → parallel → orthogonal during the phase transition sequence of phase α → γ → δ. 20 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 23 a lower structural symmetry of phase δ compared to phase α, which is consistent with our previous study. Our analyses imply that Raman and Infrared spectra are useful characterization methods for exploring structures and stability properties of RbN 3 under high pressure, even so, further experimental and theoretical investigations are required to explore the behaviors of these high-pressure phases of RbN 3 .…”

“…All these phenomena can be attributed to the distortion of the unit cell as reported in our previous XRD study. 20 From this perspective, the appearance of the L I1 mode probably stems from the elimination of 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 More crucial details about the evolution of N 3 − in the process of compression can be obtained from the mid-IR spectra. Upon compression, the most significant change in the mid-IR profile was that the the doubly degenerate bending mode ν 2 (E u ) evolved into the double nondegenerate modes, labeled as ν ' 2 (E u ) and ν '' 2 (E u ), as shown in Figure 5b.…”

High pressure studies of Ni3[(C2H5N5)6(H2O)6](NO3)6·1.5H2O by Raman scattering, IR absorption, and synchrotron X-ray diffraction

“…Perticular recently, nitrogen-rich energetic materials have attracted considerable attentions as potential precursors to synthesize a novel high energy density materials (HEDM) under high pressure. [4][5][6][7] Coordination complexes with nitrogen-rich heterocyclic groups and nontoxic metal centers become attractive candidates due to their flexible structures and favorable energetic properties. 7 Furthermore, coordination complexes contains ligand and various supramolecular interactions, such as hydrogen bonds, CH … π or π … π stacking, Van der Waals contacts or a combination of these, that intensively affect the properties of substance under high pressure.…”

Effect of pressure on sodium azide studied by spectroscopic method

“…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].…”