Journal or Book Title
Journal of Applied Physics
ilver 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, N1 at 4d, and N2 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 KOT = 39 ± 5 GPa with KOT’ = 10 ± 7 and KOT = 57 ± 2 GPa with KOT’ = 6.6 ± 0.2, respectively.
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American Institute of Physics
Hou, Dongbin; Zhang, Fuxiang; Ji, Cheng; Hannon, Trevor; Zhu, Hongyang; Wu, Jianzhe; Levitas, Valery I.; and Ma, Yanzhang, "Phase transition and structure of silver azide at high pressure" (2011). Aerospace Engineering Publications. 28.