title: Stability of hydrogen-bonded supramolecular architecture under high pressure conditions: pressure-induced amorphization in melamine-boric acid adduct.
abstract: The effects of high pressure on the structural stability of the melamine-boric acid adduct (C3N6H(6).2H3BO3, M.2B), a three-dimensional hydrogen-bonded supramolecular architecture, were studied by in situ synchrotron X-ray diffraction (XRD) and Raman spectroscopy. M.2B exhibited a high compressibility and a strong anisotropic compression, which can be explained by the layerlike crystal packing. Furthermore, evolution of XRD patterns and Raman spectra indicated that the M.2B crystal undergoes a reversible pressure-induced amorphization (PIA) at 18 GPa. The mechanism for the PIA was attributed to the competition between close packing and long-range order. Ab initio calculations were also performed to account for the behavior of hydrogen bonding under high pressure.
authors.affiliation: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, PR China.
authors.forename: Kai
authors.initials: K
authors.lastname: Wang
authors.forename: Defang
authors.initials: D
authors.lastname: Duan
authors.forename: Run
authors.initials: R
authors.lastname: Wang
authors.forename: Aolei
authors.initials: A
authors.lastname: Lin
authors.forename: Qiliang
authors.initials: Q
authors.lastname: Cui
authors.forename: Bingbing
authors.initials: B
authors.lastname: Liu
authors.forename: Tian
authors.initials: T
authors.lastname: Cui
authors.forename: Bo
authors.initials: B
authors.lastname: Zou
authors.forename: Xi
authors.initials: X
authors.lastname: Zhang
authors.forename: Jingzhu
authors.initials: J
authors.lastname: Hu
authors.forename: Guangtian
authors.initials: G
authors.lastname: Zou
authors.forename: Ho-kwang
authors.initials: HK
authors.lastname: Mao