title: High-pressure behavior of bromine confined in the one-dimensional channels of zeolite AlPO4-5 single crystals.
abstract: We present a joint experimental and theoretical study on the high-pressure behavior of bromine confined in the one-dimensional (1D) nanochannels of zeolite AlPO4-5 (AFI) single crystals. Raman scattering experiments indicate that loading bromine into AFI single crystals can lead to the formation of bromine molecular chains inside the nanochannels of the crystals. High-pressure Raman and X-ray diffraction studies demonstrate that high pressure can increase the length of the confined bromine molecular chains and modify the inter- and intramolecular interactions of the molecules. The confined bromine shows a considerably different high-pressure behavior to that of bulk bromine. The pressure-elongated bromine molecular chains can be preserved when the pressure is reduced to ambient pressure. Theoretical simulations explain the experimental results obtained from the Raman spectroscopy and X-ray diffraction studies. Furthermore, we find that the intermolecular distance between confined bromine molecules gradually becomes comparable to the intramolecular bond length in bromine molecules upon compression. This may result in the dissociation of the bromine molecules and the formation of 1D bromine atomic chains at pressures above 24 GPa. Our study suggests that the unique nanoconfinement has a considerable effect on the high-pressure behavior of bromine, and the confined bromine species concomitantly enhance the structural stability of the host AFI single crystals.
authors: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors: Zhaodong
authors: Z
authors: Liu
authors: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors: Zhen
authors: Z
authors: Yao
authors: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors: Mingguang
authors: M
authors: Yao
authors: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors: Jiayin
authors: J
authors: Lv
authors: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors: Shuanglong
authors: S
authors: Chen
authors: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors: Quanjun
authors: Q
authors: Li
authors: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors: Hang
authors: H
authors: Lv
authors: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors: Tianyi
authors: T
authors: Wang
authors: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors: Shuangchen
authors: S
authors: Lu
authors: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors: Ran
authors: R
authors: Liu
authors: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors: Bo
authors: B
authors: Liu
authors: Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
authors: Jing
authors: J
authors: Liu
authors: Geoscience Department, Stony Brook University, Stony Brook, New York 11794, USA.
authors: Zhiqiang
authors: Z
authors: Chen
authors: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors: Bo
authors: B
authors: Zou
authors: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors: Tian
authors: T
authors: Cui
authors: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors: Bingbing
authors: B
authors: Liu