title: A Novel High-Density Phase and Amorphization of Nitrogen-Rich 1H-Tetrazole (CH2N4) under High Pressure.
abstract: The high-pressure behaviors of nitrogen-rich 1H-tetrazole (CH2N4) have been investigated by in situ synchrotron X-ray diffraction (XRD) and Raman scattering up to 75 GPa. A first crystalline-to-crystalline phase transition is observed and identified above ~3 GPa with a large volume collapse (∼18% at 4.4 GPa) from phase I to phase II. The new phase II forms a dimer-like structure, belonging to P1 space group. Then, a crystalline-to-amorphous phase transition takes place over a large pressure range of 13.8 to 50 GPa, which is accompanied by an interphase region approaching paracrystalline state. When decompression from 75 GPa to ambient conditions, the final product keeps an irreversible amorphous state. Our ultraviolet (UV) absorption spectrum suggests the final product exhibits an increase in molecular conjugation.
authors.affiliation: State Key Laboratory of Superhard Materials, College of physics, Jilin University, Changchun, 130012, P. R. China.
authors.forename: Wenbo
authors.initials: W
authors.lastname: Li
authors.affiliation: State Key Laboratory of Superhard Materials, College of physics, Jilin University, Changchun, 130012, P. R. China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Superhard Materials, College of physics, Jilin University, Changchun, 130012, P. R. China.
authors.forename: Kuo
authors.initials: K
authors.lastname: Bao
authors.affiliation: State Key Laboratory of Superhard Materials, College of physics, Jilin University, Changchun, 130012, P. R. China.
authors.forename: Zhonglong
authors.initials: Z
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Superhard Materials, College of physics, Jilin University, Changchun, 130012, P. R. China.
authors.forename: Yanping
authors.initials: Y
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Superhard Materials, College of physics, Jilin University, Changchun, 130012, P. R. China.
authors.forename: Lu
authors.initials: L
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Superhard Materials, College of physics, Jilin University, Changchun, 130012, P. R. China.
authors.forename: Gang
authors.initials: G
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Superhard Materials, College of physics, Jilin University, Changchun, 130012, P. R. China.
authors.forename: Bo
authors.initials: B
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Superhard Materials, College of physics, Jilin University, Changchun, 130012, P. R. China.
authors.forename: Defang
authors.initials: D
authors.lastname: Duan
authors.affiliation: State Key Laboratory of Superhard Materials, College of physics, Jilin University, Changchun, 130012, P. R. China.
authors.forename: Fangfei
authors.initials: F
authors.lastname: Li
authors.affiliation: State Key Laboratory of Superhard Materials, College of physics, Jilin University, Changchun, 130012, P. R. China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Superhard Materials, College of physics, Jilin University, Changchun, 130012, P. R. China.
authors.forename: Bingbing
authors.initials: B
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Superhard Materials, College of physics, Jilin University, Changchun, 130012, P. R. China.
authors.forename: Tian
authors.initials: T
authors.lastname: Cui